Perfect, not too long not too short. Just perfect explanation. I'm about to do my first pcm read and flash and I feel more confident from this! Thank you!
Great video well explained. I don't have ac, and I have done this, but PCM still don't Triger the fans. I know that they work i have tested them. What would be your thoughts on this? Thanks
When you say tested, have you eliminated the PCM being the issue by grounding the blue or green wire independently of the the PCM (you can unhook PCM from vehicle and probe the wire harness side of harness if wires are ran). Of course this test requires battery and a GM fan harness to be hooked up. PCM can remain unhooked,no key in ignition either. If fans don't turn on when the green or blue wire is probed something is wrong 'down stream'. Report back on what harness is being used,etc.
@@2muchsplYes sir, I have disconnected both green and blue wires for the correct pin locations on blue and red connectors and grounded the wires and the fans work as they should. I also have confirmed several times that they are in the correct pin locations in the PCM to trigger the fans. I also have tested this with the water temp sensor hooked up and heated the sensor up to 260 degrees with no response from the fans when hooked up to the PCM. I did find a spot in there somewhere to tell the PCM that there was NO AC present in the vehicle. Thanks for responding
@@2muchspl 2001 Tahoe and I have also tried a 2002 Escalade. I am not worried about the second fan if I could just get the one to come on that would be fine for now.
@@sbb8079 may have to turn auto-recir on. Its under [extra categories] Vehicle System/AC/Auto Recirculation Option. It should be for fan #2 control. I dont have a Blue/Red PCM to confirm though. Btw my AC is still on PPEI_Cycling even though I do not have AC. Im not sure if that matters or not,just a heads up
What's the difference between parallel, auxiliary, EV fans ?..I got dual fans both hooked up to pcm(green wire)...I went with auxiliary..trying to see which is best down here in texas heat.
Parallel= 2 fans with GM style harness. It can split voltage to give fans a low and high speed,even if fans used are single speed. Auxiliary = 1 fan, this is a single output that will control 1 fan at high speed only. Of course 2 fans can be added on separate dual relays but both fans will operate in on/off high speed only. EV = is for PWM fans, around 2006 or so on the GTO, Vette & most of the Cadillac. GM went to Pulse Width Modulation on fans (and fuel pump for some). PWM is a very fast pulsing that allows for a motor to spin slow/fast depending on pulse. This gives the PCM full control on how fast fan turns. This can only be used if using a PWM fan from a PWM vehicle.
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Thanks for the videos. I’m gonna get the nerve to start trying these things. I’m still an old hack. I like the lt1s.
Perfect, not too long not too short. Just perfect explanation. I'm about to do my first pcm read and flash and I feel more confident from this! Thank you!
Fantastic exactly what I needed much appreciated
love the t-shirt
It's one of my favorites lol!!! Thanks for watching
Great video well explained. I don't have ac, and I have done this, but PCM still don't Triger the fans. I know that they work i have tested them. What would be your thoughts on this? Thanks
When you say tested, have you eliminated the PCM being the issue by grounding the blue or green wire independently of the the PCM (you can unhook PCM from vehicle and probe the wire harness side of harness if wires are ran). Of course this test requires battery and a GM fan harness to be hooked up. PCM can remain unhooked,no key in ignition either. If fans don't turn on when the green or blue wire is probed something is wrong 'down stream'. Report back on what harness is being used,etc.
@@2muchsplYes sir, I have disconnected both green and blue wires for the correct pin locations on blue and red connectors and grounded the wires and the fans work as they should. I also have confirmed several times that they are in the correct pin locations in the PCM to trigger the fans. I also have tested this with the water temp sensor hooked up and heated the sensor up to 260 degrees with no response from the fans when hooked up to the PCM. I did find a spot in there somewhere to tell the PCM that there was NO AC present in the vehicle. Thanks for responding
@@sbb8079 what year was PCM from?
@@2muchspl 2001 Tahoe and I have also tried a 2002 Escalade. I am not worried about the second fan if I could just get the one to come on that would be fine for now.
@@sbb8079 may have to turn auto-recir on. Its under [extra categories] Vehicle System/AC/Auto Recirculation Option. It should be for fan #2 control. I dont have a Blue/Red PCM to confirm though. Btw my AC is still on PPEI_Cycling even though I do not have AC. Im not sure if that matters or not,just a heads up
nice video!
What's the difference between parallel, auxiliary, EV fans ?..I got dual fans both hooked up to pcm(green wire)...I went with auxiliary..trying to see which is best down here in texas heat.
Parallel= 2 fans with GM style harness. It can split voltage to give fans a low and high speed,even if fans used are single speed.
Auxiliary = 1 fan, this is a single output that will control 1 fan at high speed only. Of course 2 fans can be added on separate dual relays but both fans will operate in on/off high speed only.
EV = is for PWM fans, around 2006 or so on the GTO, Vette & most of the Cadillac. GM went to Pulse Width Modulation on fans (and fuel pump for some). PWM is a very fast pulsing that allows for a motor to spin slow/fast depending on pulse. This gives the PCM full control on how fast fan turns. This can only be used if using a PWM fan from a PWM vehicle.
@@2muchspl thank you man...I went with auxiliary, 2 fans 2 relays...dbm question, but it won't burn down my fans faster right ?
@@MOE13576 no you should be fine, make sure main power that feeds the relay is fused (if not using the GM style harness)
@@2muchspl got it man. Thanks. Subscribed.
@@MOE13576 appreciate the sub!!
Great video, what temperature are you putting in?
What did you end up going with?