Is Your C5 Corvette Running Hot? (How to know for sure AND what to do about it!)
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- เผยแพร่เมื่อ 24 ก.ค. 2024
- What temperature should your C5 Corvette normally see as you are driving down the road? Is it too hot & is something wrong? Here is how to tell for sure and what you can do today to help lower those temps a bit.
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Another superb video. One of the best sources for C5 owner videos is here. Always factual information versus anecdotal information. Anyone who owns a C5 should spend time reviewing the many other excellent videos. Thanks again and looking forward to your future C5 videos.
Thank you for the kind review - much appreciated!!
Just bought a 98 C5 and noticed this was a problem. This video brought so much clarity great video brother
I was driving my 98 C-5 a day ago and it got up to 220 and was freakn me out will definitely do this to mine very soon !
Nice job very well done...easy to follow and packed with great information
Thank you, I appreciate your feedback sir!
that juicy bug comment made me chuckle! great video, gotta do this some day soon to our C5.
Yeah, if it's been a while I think you'll be surprised!
I knew the fans were set high but didn't know it was set that high! My 03 is always at 220 even after I blew out the radiator. Watched it hit 235 for the first time this summer while in traffic, kills me inside but keep reminding myself this was gm's design. Great stuff as always!
Thank you!!
I would like to hear GM 'S engineering depts answer on this wouldn't you ? Lol
Like usual, great video!
Excellent video. First thing I did when I brought her home last week :D Didn't get as much you but a significant amount of debris to hopefully make a difference and avoid issues. Now on my list of regular maintenance for sure, thanks.
Thanks for taking the time to comment - and ENJOY!
Good information, thanks. I was aware of modern engines running better hot but not to the extent of almost 230 F.
Just finished installing an 25% underdrive damper and have been a little concerned about the coolant temp and ordered a 160 F thermostat .
Luckily ,if you want, Summit send me the wrong one( too long) so I reinstalled the original
186 F.
I guess I won’t have to freak out seeing temps in the 220 F in traffic.
BTW, I live north of the 49th.
yo cant thankyou enough for all these vids you make has helped me alot with my c5
I appreciate you taking the time to say that! Thank you!
A very good video. You did a great job relaying the information.
Thank you sir!
Great info as always.
I had my fan temps tuned lower too, and It did make a difference.
I run around 196 normally.
Yeah, agreed, I'm willing to pay the price if the fan wears out a couple years earlier to keep it around 200! And thanks for the feedback!!
Terrific as Always! I had a rad fluid change done in the spring. Also bought a new coolant cap. It’s running hot sitting in traffic (or hotter then it historically did.) It’s due for a condenser-radiator clean out. Thanks for showing me how to get the rad fans out!! I’ll get the shop to see what the fans are tuned to as well.
Thank you sir - appreciate the feedback!
Great info and video quality as usual also Excellent tip for new C5 owners out there. I did mine a few days after I bought it. It had never been done by any one for the 1st 50,000 miles of its life. They had plastic bags from the grocery store, dirt, bugs, feathers, grass etc. I pulled about 2 dustpans full of stuff out.
After that I made a screen out of 1/4 x1/4 hardware cloth to protect the condenser from getting hit with rocks and debris cause I’m on the interstate most of the time I’m driving.
It’s been a year that I’ve had the screen on and haven’t had anymore issues with build up in the Radiator. Also the screen does not interfere with airflow at all and my temps stay very consistent. I’m also located in south Louisiana where we have long hot summers and high humidity. Even when I get stuck in bumper to bumper traffic in New Orleans might temps always stay the same.
Excellent information and what I like most, first hand feedback like yours about some new thought or idea! Thank you sir!
Great video. I'll have to give it a try as i'm noticing my C5 is heating up at stop lights on warm days.
Thank you sir!! Report back how much crud you find !
Thank you for showing the stock tune data. 220 is perfectly normal. I guess in a lifetime of previous vehicles 220 degrees was bad news.
Yeah, I remember the days as well with the older cars, whenever it hit 220 you shut it off!
Mine reaches 240°. Is that normal?
Great info,thank you.
Great video! Saved for my future C5 !
That's awesome, thank you!
Excellent topic! I wasted many fun cruises on hot days in fear that my '99 may overheat, especially during the Woodward Dream Cruise or other major events. Thanks so much for clarifying and educating us brother!
Thank you for the feedback sir I appreciate it very much!!
Great video
Good information with my 04. I bought some 1/2 inch pvc and caped off one end put a hose adapter on the other end drilled 2 holes at the caped end fits nicely and the water cleans well and keeps the system running smoothly with the a/c on on a hot fla day runs 180 f all day i do have the 160 thermostat black on black long tube headers btr stage 4 cam i clean it the radiator area all the time and i do not use dexcool i use distilled water and hyperlube for cooling i use amsoil 10W40 z rod change the filter every 800/1,000 miles since i had the rpm level 5 transmission put in the transmission temp hit 154 one time runs around 143 the rear get amsoil 75/90 server gear keeping everything fresh and clean is the key to a long and enjoyable experience with your corvette stay safe and good traveling every one
Nice!
Great video, I clean my radiator 2x a year, I call it a c5 vacuum, it picks everything off the road 😎👍
Indeed it is a vacuum, and thank you for the comment!
Still don't own a C5, but learning a lot from your channel. 👍🏻👍🏻
Are you holding off until the prices get back to "normal"? Appreciate the kind words!!
You are at the right channel. Unbiased and accurate content. As an owner of a C5, this is one of the few channels I always visit. These C5’s are old and some years have issues. Most are small, but a few are worth seriously considering. Best of luck with your future C5 search.
Thank you for the kind words sir!
I had a problem last fall and when I pulled it out it was completely plugged! Instead of putting it back in I opted for a double core radiator from Worley Cooling. They said exact fit,but not so much . However it was $350 cheaper than DeWitts and with a little extra trimming I got it in and it works great. Never goes above 196. Best thing l have done to the car! 👍🙋♂️🖖🏻
I think it depends on where you live in the country in my opinion. Here in minnesota, stock is good.
0:50 I took the thermostat out of my c4 and I tested it in water against a 160. btw the old one was also an 160F and the new one opened wider so it’s possible a lower tstat to allow more fluid flow than a stock one. Anyway the car overheats the same way, I suspect clogged preconverters.
235F the highest I recorded on the digital meter on racetrack but immediately after that I began a cooling lap high speed - light throttle. at 226 I have both fans running in my c4 1991
if the car has overheating problems by design it’s possible to design a water mist system with distilled water. that should give it significant cooling improvement. all you need is a 12V 5bar+ pump, a few nozzles, tube, fittings, then electronic modules: a relay, thermostat or arduino module with thermistor.
I used an air wand like you have. I straightened it out and put a screw in then end of it. I then filed a notch in the side of it near the tip. I can slide it between the fans and the radiator to blow it out without having to remove the fans. I put a thin piece of wood between the radiator and the condenser so that I don't blow the debris from the radiator into the condenser. I also blow it back to front (I think you do too). Side note. I live in the desert. The hottest my C-5 gets in traffic is about 111 degrees. I have driven in temperatures over 110 and my car will be between 194 and 197 degrees.
That is pretty creative - looks like it is working well for you!
I like to keep the rads clean, but I think I will get a Coot It V3 just to have some insurance. I hit 220 in Branson, MO last time. It was 97 outside. HP Tuners for my pickup was $650. I don't want to do that again just to change the fan tune. Very informative video again. You do a great job every time.
If you already own HP tuners, it's a hundred bucks to license another vehicle.
@@Toys4Life Thanks, I thought it was "married" to my pickup.
A low temp thermostat definitely helped lower my engine temps. And I live in Las Vegas.
How? Unless you have a giant radiator with good fans, it is not going to run under 180 in traffic. That is what it would take to get to run cooler than the stock T-stat IMO.
My 1995 LT1 Camaro had a bad sending unit hot lead wire. Tracing the fault was costing me. When ever it got hot. i just turned on the Heater or the AC and it brought the temps down.
Great video. I always keep an eye on the air inlet shroud. I must have an unusual c5 z06. Mine runs 190 all day on the highway and 205 in traffic.
Thank you sir!
so you live in siberia?
I did two things to really make the difference. Installed an aluminum radiator by DeWitt and second, installed a fob remote to control my secondary fan manually at any time. But, it never gets over 195 and I live in a high desert. So, on a day of 100 and stuck in traffic, my ZO6 runs at 190 with no fan fob activated. Just double safety as this alleviated my problem. Plus, I switched to the green antifreeze as it is better.
That new radiator would work super well just having your stock fans tuned to come on a bit earlier too. Nothing wrong with 200 IMO, I just don't like being 215 and above... Unless I am at the track, then 185-195 is good!
That green antifreeze gonna screw up your aluminum
I've seen 235-240 in my 2004 Z06. But i live in texas and it was 98-100 degrees outside. I was on a farm market highway doing about 60-90 miles an hour in 3rd/4th gear. I laid off the throttle a bit and temps started to drop. I know the radiator is probably dirty, but I may have a fan issue as well. Ever since that day I watch the temp gauge every time i take the car out.
240 makes me nervous. 60 mph should be more than enough to keep it cool.
@@Toys4Life Hopefully its just a dirty radiator.
I washed my radiator off from back to front with a garden hose and a deflector. Huge improvement. But! I’m still having over heating problems. The fan fuses are fine. I don’t like the high temp fan tune from the factory. Going to look into lower them.
Is it actually overheating or running hotter than you'd like?
It gets to the point of red and where the dash displays warning, so I end up putting the heater on full high.
It gets to the point of red and where the dash displays warning, so I end up putting the heater on full high.
The radiator genie tool is remarkably effective at cleaning out the rad and condenser too. Much easier than removing anything.
Good tip!
Just bought the genie, haven't used it on the c5 yet. Don't you need to remove the fans or disconnect them?? From the top I hope....
@@user-nz6oc2oh5y I didn't remove the fans, just blew it from the front. Definitely did disconnect the battery tho just in case!
Mines at 205. Got to get that dual radiator. Well I do live in Florida
Thank you for taking the time to comment! Good luck keeping her cool!
Thanks for the content sir. Can you please point me in the right direction for HP tuners? There are a number of different plug ins available for widely varying prices and I'm not sure which one I need. I'd like to be able to adjust my fan thresholds as you've done, as well as do things like deprogram the shift light if/when I decide to to the CAGS bypass in the future.
I just went to their website. I think something is broken at the moment. If you just want to do basic things you could do the base model for $399 + you would need 2 credits (2x49.99) for a C5 corvette.
I would email them during normal business hours. I have been using their product for 8 years or so and have found them to be pretty responsive. www.hptuners.com/products/
Love your videos. What type of air compressor did you use? Max PSI, brand, etc.? Yesterday, my 03 Z06 reached 250 degrees while coming home from the gym. Going to clean the radiator and see whether or not it corrects it.
150 psi. Anything over 100 will do. If it's really dirty, it might be worth the time to remove the fans and the shroud so that you can really get at it and remember to blow it forward not towards the engine. Good luck!
@@Toys4Life Thanks!!!!!
Love your videos - very informative. I live in the High Desert of Arizona and my C5 has ran real warm since I've owned her. Straight off I replaced the stock radiator with a 4 row for a Caddie X series, quite a bit bigger and the front cover doesn't fit tight , about a inch of opening between the radiator and the front cover. ???? (Thinking about fabbing up a new cover from Aluminum that fits tight.) Anyway, I've replaced the fans, thermostat (3x) and water pump. I have the fans on a manual switch and relay and she still runs warmer than I like. Do you think the open gap between the radiator and the front cover may have something to do with it?? ( Instead of the air going thru the radiator, it's going around the the radiator.) I'll watch to see your answer.
Terry Yager
That's a pretty good size gap, I would try to seal it.
New C5 owner and learning a lot from your videos. Should you put something between the rad and the condenser to stop cross contamination while blowing through them?
I don't think so. If it came in from the front and you're blowing it forward from the rear it should push out. Never blow from the front towards the rear because you might just impact things further into the radiator or condenser.
Thanks super Dave Osborne.
Come on now, I don't think I look like him- do I?
@@Toys4Life just kidding but I do love the videos very informative.
Friend, amazon sells a water and blower wand that is skinny and fits in without having to remove parts. Works wonderful. Also, when you blow out your radiator, put a piece of cardboard between it and your condenser so your not blowing dirt from the radiator into the condenser. In any event, right idea.
Friend - yep, Radiator geni. Still need to remove the fan shroud to get at most of the radiator IMO. Your cardboard idea is not terribly helpful - it blocks airflow - and airflow is what you need to drive the crud back out towards the front. The big chunks are stuck to the front of the condenser, the smaller junk that made it in from the front can be blown back out the front. Looks like we disagree on methodology. Where are the myth-busters when you need them. At any rate - both methods are better than the head in the sand method.
Cheers!
@@Toys4Life Ok, I'll tell you what. Many thanks to you TH-cam guys for putting these videos up. Just spent 3 hours cleaning condenser and radiator fins on a "running hot vet". Worked like a charm. I would never have guessed that much dirt and grit got up in there. In defense of GM, the design is very good. My kids 1998 C5 condenser and radiator are in fantastic shape, just were clogged with dirt. I'm in Vegas - a dirty, dusty town, but I can see where this would be common throughout the desert southwest.
My car usually runs stock at 221-223 while driving most speeds and sitting in traffic, now if I really get on it during a hot day I’ve seen 235-239 max but cools down back to 217 when I get off it. Now my fans are always on, first one kicks on at 200 I believe and idk about the 2nd, however they never turn off and can never get the car below 217 on summer days and never below about 208 on cool days. Plan on coolant flushing, checking the thermostat, cleaning out between the radiator and condenser, replacing air filters, and possibly replacing the condenser and radiator if needed after the first things. Idk if anyone will see this but would def like some advice on what definitely needs done here
Clean and blow both the condenser and radiator out (remove the fans& shroud so you can get at it good) and blow from the engine bay forward. On the front of the condenser check for cooked thick bug guts that plug the fins. If there are a lot, try a bug cleaner first to try to loosen the hardened guts up.
Could help to flush the radiator and make sure you’re using only GM approved coolant on top of what was shown here.
Good point - especially if you know the coolant to be at or past the change interval!
Really enjoyed video. I’m getting ready to change all the hoses on my 2003. Do you have a video on purging the air from the system? If not is there an easy way to do it?
Coming soon!
Ive been looking all over the internet for a video on burping the system i changed my thermastat today an been having heating problems ever since
@@matthewbaker6902 I know what you mean. I have not found an in-depth step by step video.
What did you do with the sway bar? My fan shroud is completely blocked by my sway bar. It makes the 15 min job a lot longer.
I hope I'm reaching the author of this video...If not, please tell me how to do that.......I have a 2000 C-5 and am having the overheating problem. I'm the original owner and it's 2023. The temp never exceeded 220 in any conditions on Long Island for 22 years. The original factory coolant was emptied, blown out and replaced in 2002. NY....where's there's plenty of traffic. I have replaced the fan assembly, thermostat & fan temp sensor. I've cleaned the radiator & condensor as you suggested & blown out the metal coolant tube connecting the two sides of the L & R engine block. When I turn the car on at cold...The radiator hoses get hot in the order of flow as does the radiator. In traffic at a light and at 42 degrees outside, the digital computer read-out went to 238. As I said....It never rose above 220 till this year. Please help if you know the next step. The pump and radiator seem fine and the system has been flushed, air locks cleared and fluid level is always full. No sign of a leak anywhere including where the pump mounts to the block. Thank you.
I would use an IR temperature gun and double check various spots on the cylinder head and radiator hoses to see if it agrees. It could just be your gauges reading wrong, a problem with the sending unit, wiring or instrument cluster. Has it actually boiled over at all and spewed coolant out?
Hi! Thanks for the video you are great. I just bought a 2008 C6 with the LS3, and in one of the first drivings i got stuck on traffic and the gauge was showing between 220-230. I got super worried of course bc i didn't know this. Please if you or someone can confirm this is true for my model too i would be glad. Thanks!
85% sure that is normal - I would have to look at a stock tune for an 08 LS3 to get to 100%
Hi, great video! I have an 05 C6 Base model. Which HP Tuner model did you go with? I want to see if it is compatible with a C6. Thanks!
HP tuners is compatible with all c6's. Mine is 10 years old and has been superseded by newer models.
I remember the first time I saw 225 temps in my vette. My eyes about popped out lol.
I too was getting nervous!
Hey thanks for the video! How did you change the fans to come earlier?
Hp tuners.
@@Toys4Life sorry to ask so many questions is there a reason why we can’t use condenser spray cleaner like they use on outdoor ac units?
I think that would be fine- but you still need air pressure to dislodge debris. Cars are moving fast which really crams crud in there, home ac is just sucking in air at relatively ow speeds.
Nice vid! I actually did this a month ago and it did help.
What program is that you used? Also, does it allow you to make changes or just review? TIA!
Hp tuners
@@vitalirider707 Thanks. Do you have an advert for the second question?
@@lexxielex ye, hp tuner is car soft programmer capable of changing some parameters
www.hptuners.com/
@@Toys4Life thnks sir
I recently installed a Tiger Shark front bumper and I noticed immediately that my temp dropped about 15-20 degrees because of the giant open front grill on the aftermarket bumper
Interesting!
Is your oil temp still getting to 220-230? With the lower fan temps?
Also where did you get the right angle blow gun?
Just made if from a piece of brake line and a regular blower.
I recently just did a heads-Cam-Intake-Exhaust upgrade with all accessories like trunnion and oil pump and chain upgrades. I’m running up into the 230s, but it takes about 20 minutes of running to get up to that. What do you think may be causing that heat spike. Keep in mind that I added a bigger radiator, a new condenser and an external trans cooler. The vehicle has a start up tune and that’s about it. Any help will be greatly appreciated.
230F - is that just sitting there in the driveway or cruising at 60mph?
@@Toys4Life both, it also gives me a low coolant notification although the reservoir is at the fill line.
Got a C6 question if you can help, our car was hit in the left front corner, it was a fairly light impact not to bad, but it has caused an overheating issue that the insurance adjuster cannot figure out, it was not overheating prior to the hit, do you know what could be the possible issue from a left corner impact,
I noticed the air intake knocked loose but that doesn't seem to be the main issue.
It overheated and dumped all fluid but adjuster cannot see a damaged hose or damage that would cause it.
I've worked on many cars and they don't usually dump fluid without a hose bust or knocked loose so it's not making sense to me.
Thanks alot,
Something pinching a radiator hose? Insurance adjuster typically isn't going to try to diagnose anything, they are just going to look at the physical condition and create an estimate of parts and labor to repair is my understanding. Something from the impact sever a wire leading to your cooling fans?
@@Toys4Life thank you, it has to be something small like that, like I said it wasn't a hard impact but something has it over heating, the dealership has the adjuster who works with them on site so I am going to get another shop to look at it without a "friendly" adjuster on site.
Keep the ac on,it will stay cool.
I reckon so, but keep in mind the warm air from the condensers getting blown right into the radiator.
What should oil temps be at for highway driving and having fun?
I would say low 200s.
I'm guessing to look at your Temp Guage???? I could be wrong. ;)
Good idea (:-)
@@Toys4Life lol sorry...I just had to ;)
Take the hood off. Fixes it every time. 😉
And it makes it lighter! - a double win! Simply genius!!
Is my automatic transmission in my C5 supposed to get up to 235 degrees as well? That is what is frustrating to me. The engine runs hot which in turn makes my trans run hot. I am installing a trans cooler but that then blocks even more airflow through the condenser and radiator. The trans is not supposed to get over 200 degrees from what I hear, but it is cooled within the radiator.
How about a remote transmission cooler with a little fan. I definitely would try to keep it below 220.
is it possible to make wire mesh for the future to go there? or is it just not that helpful?
IMO any mesh that would be fine enough to keep a lot of stuff out would hinder flow - I would just count on cleaning every once in a while - depending on the conditions of where you live. Pays to take a peek often - in case something like part of a bag gets stuck up in there!
Um, I know its clear in the film but you did not mention removing the swaybar to facilitate removing the fan assembly.
Good Eye sir! I did the radiator cleaning at the same time as I was replacing the harmonic balancer. As such, I already had removed the sway bar as part of that job. I would have to take a good look to be 100% certain, but I don't believe it is required to do the job. Even if it is, it is very easy to drop the sway bar and only takes 5 minutes. Thanks for pointing that out!
@@Toys4Life Well I own four of the dang things so I been over pretty much every service needed on them. Your very concise explaining things, Bravo.
mines running at 220-230, I bought it recently and going through small issues, idler pulleys and this are next. What kind of tempurature difference would you expect?
It depends on how clogged it is and the ambient air temperatures in your area. 220 in stop and go traffic is not unusual.
@@Toys4Life What have you seen it do as far as temp drops go?
So upgrade whatever pump and radiator got it
.
240° is normal for a c5 corvette? Can someone please explain to me?
Explained here. 02:33
💯💯💯💯
Wondering if, since you have computer tuning capability, why not reduce coolant temp down a little further, say 190? I know heat is the enemy of both horsepower and longevity. Would that much of a lower temp be possible? Would it not increase performance, especially since your ‘Vette is supercharged? NOT an expert myself, and not being snarky, just honest curiosity.
I do that for when I'm at the track, but for everyday use it's just too much wear and tear in the fans and really doesn't add a tremendous amount for daily driving.
@@Toys4Life Totally agree. Thermodynamics make power. (Retired nuclear power worker.) Hotter operating temperatures in modern cars are normal. Many cannot forget the past when it comes to coolant temperatures. Your comments on the thermostat and dirty radiator is good advice.
@@nikkoalpha2 I appreciate you taking the time to add your comments sir!
I just don't think removing that fan was necessary. That long nosed air nozzle would easily have gone in and around the blades. Besides most people don't have a lift. Jacking it up and getting a couple jackstands under it would be the best they can do.
Since the early 70s even in the 60s people have complained about vetts running hot.
It would be very difficult to do a good job with the shroud and fans blocking access. Remember you need to go straight through the fins so as to not bend them and to also have a chance to also blow though the condenser. If you are not straight on you risk bending them (with high pressure) and losing airspeed which will limit the ability to have enough airspeed to do a good job on the condenser as well.
In traffic in hot day, 230 - 220 norm?
Yes sir! - 2:15
Where did you purchase rims and are they 18 or 19’s
The yellow thump is not my car so I am not sure. My black C5 are stock rims.
how about 60/40 water in the rad?
If you live in areas that do not freeze (Leaves me out in MN) then that could be of some benefit! Still, these cars are 20 years old and most have some blockage that should be cleaned if possible.
@@Toys4Life oh i agree completely about the cleaning. Every year when i do an oil change on my C6, i will take the vac and a blower to that area. At some point, i will take out the shrouds and clean.
Oh I guess 235 is not normal🤣
What happened to corvette takeover???
That would be Yellow Vet 04's TH-cam channel. I saw that it disappeared as well. That's on the East Coast I'm in the midwest.
Mine tends to run hot when my wife is in it.
You know cuz...
Wow, that sounds like a good problem to have!
Would really help if the average Joe had a lift to get it that high to drop fans from bottom
Agreed, but if you get the front end up pretty good on jack stands I think that should be enough.
my bobcat skidster runs at 272 normally, but thats diesel, i dont know
Makes 2 of us (:-).