Mini Cooper Low Speed Cooling Fan FIX
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- เผยแพร่เมื่อ 21 ต.ค. 2024
- My R53 Mini Cooper S low speed fan resistor failed. I find a unique solution to repair it with a bracket and new aftermarket resistors. This modification should also work on any 1st Gen Mini Cooper Hatch R50 or R53.
Hi! Great vid. How much would you charge for the bracket with all mounting points?
Why have you used 2 resistors...all the other same fixes use only one? I was on my way to do it when I found your fix and now have doubt...thanks in advance for your advice.
At a total of 0.6 ohms in series, the two resistors will be dissipating approximately 82 watts of power when factoring in the additional 0.6 ohm resistance of the fan (at 14v). A single 100 watt 0.6 ohm resistor would technically be sufficient, but the resistor rating is dependent upon being installed using thermal transfer compound and a suitable heat sink to be capable of such a task, and even then, it would be very near maximum rating. To make matters worse, many suggestions online I've seen are recommending a single 100 watt 0.3 ohm resistor, which would be dissipating approximately 137 watts of power, which is obviously over the rated limit, and is also dependent upon proper use of a heat sink. Without a heat sink the resistors are only rated for approximately 1/3 of the listed figure. (33 watts!) For all the above stated reasons, in an effort to reduce the possibility of overheating and failure of the resistors, I am using a 0.6 ohm resistive total load, spread across two resistors (41 watts each). As shown in the video I have also chosen to mount them via thermal compound to an aluminum bar, and inline with the airflow of the fan, which is at least partially required to keep them cool and prevent future failures.
TLDR; More resistors in series spreads the thermal load and helps prevent future failures. Also, use a heat sink, or at least mount them with thermal compound to something big flat and metal, and preferably in the path of airflow somewhere.
TLSDR; Two is better than one.
Good luck!
@@ShanesGettingHandy
(my R53 2005) recently bought single nominal 0R33 100W, cheap from Amazon. Prior to installation I hooked up with patch cables,
Resistor in series with fan (i.e. stage one), battery voltage at the connector was 12V5, current 8A3, resistor dropped 4V3 and fan 8V2..... therefore fan 68W, resistor dissipating 36W (acceptable for 100W wire-wound).
A couple of observations, calculated resistance based on 4V3 / 8A3 = 0R52, I guess perhaps tough for them to make an accurate 0R33 resistor as it's such a low resistance.
Fan startup current was quite a bit higher (momentarily about double) so cables need to be sized for 20A minimum. Above measurements are steady state recorded about 10s after fan start.
Without the resistor in series (i.e. stage two) recorded current 13A = fan 160W.
I'm not into electronics, maybe it's an obviuous question, does the fan spin slower then it should with two resistors? @@ShanesGettingHandy
@@andreacicerale192 oui c'est sur qu'il tourne moins vite! Plus on rajoute de résistances en série moins il tourne vite. Imaginez un nombre très important de résistances en série et le ventilateur ne tournera plus du tout !
@@mruuuuuu J'ai comparé la puissance de tous les ventilateurs disponibles en échange standard. La puissance varie de 160W à 260W. Donc I peut monter à 21 Ampères en régime permanent. Bien plus encore au démarrage. Ce qui explique le fusible de protection de 50 Ampères !!!
I think you have the same scantool as me. It is a great deal IMO
I couldn’t believe how relatively affordable it was for what you get.
So you have the first gen fan with two plugs? And just wired the new resistor inline bypassing the old resistor?
Yes, this is the style with two plugs. The wire is connected right to the assembly where the original resistor was located.
Okay thanks so much. So tired of burning up oem resistors and there’s just not as much info on the two plug fans
What app is that?
Kingbolen scan tool with the Ediag app. It’s available on Amazon last I checked.
Honestly repositioning the resistor at this point is probably good for reliability n durability, I did 100W 0.33R but it lasted 2 weeks in hot summer, then I did 100W 0.68R it lasted 1 year so 2 weeks ago I did parallel 0.33+0.68 100W 😅, it seems the stage 1 speed fan On good shape of speed like the OE after 105 degrees Celsius soon later the T back to 101-99 dC , hope this last forever I don’t know however! It’s cost less than $10 but yeah I still put on the left side
Good vid help everyone who basically don’t need to purchase a new whole assembly 👍
Nice to hear additional experiences with a similar modification. I was hoping that the aluminum bar as a heat sink, placing it all in the airflow area, and the doubling up of resistors would help to keep it cool enough to last a while. I guess we shall see!
I've replaced the fan and resistor and still have no fan. The fuss are all good and still no fan high or low
Check the relays next maybe?
Engine Coolant Temperature Sensor
If I don't have which is other fans can fixing in mini
The official solution is to replace the entire radiator fan assembly.
Used 2 resistor the fan go faster because i just put one today ??
The resistors will last much longer before failing again if using two.