Low Speed Fan Resistor - we need solution - Page 58 - North American Motoring


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Low Speed Fan Resistor - we need solution

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  #1426  
Old 10-06-2017, 07:58 AM
r53coop r53coop is offline
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This is long distance diagnostics so the more information we have the better chances we have at coming up with what to check on. Need some temperatures, the MINI will provide numbers in Celsius if you bring the information up.
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  #1427  
Old 10-09-2017, 08:31 AM
TBeast TBeast is offline
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Hey, thanks. My thinking is that: since it's not overheating with the A/C on, the high speed is working. Nothing has changed since the resonator mod but current goes through the resonator (that I know because it's heating up when the A/C is switched on) so I wired it up properly. If it was a blown thermostat it would overheat despite A/C on or off. Also I remember reading somewhere that the A/C blowing briefly hot air when set to cold is somehow related to the malfunctioning low speed fan resistor but I can't find the quote. Oh well..

Yea, MINI will bring up the numbers if I let it sit still and overheat and wait to listen for the fan to kick in, which means it has to idle for 20 mins after it reaches normal temp, correct? All my neighbors will go crazy until I figure it out. I was kind of hoping that it would be one of these well known issues for the little buggers
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  #1428  
Old 10-26-2017, 09:34 AM
Jeff Cole Jeff Cole is offline
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Read every page of this thread, thanks to all contributors. My 1st stage fan was dead.

anyone ever think this is why so many have split header tanks and leaking hoses? Because they run too hot due to this fault?

anyhow, did it at the weekend and it's working. Thanks all.
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  #1429  
Old 10-26-2017, 05:36 PM
LAHills LAHills is offline
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Temp switch

Quote:
Originally Posted by TBeast View Post
Hey, thanks. My thinking is that: since it's not overheating with the A/C on, the high speed is working. Nothing has changed since the resonator mod but current goes through the resonator (that I know because it's heating up when the A/C is switched on) so I wired it up properly. If it was a blown thermostat it would overheat despite A/C on or off. Also I remember reading somewhere that the A/C blowing briefly hot air when set to cold is somehow related to the malfunctioning low speed fan resistor but I can't find the quote. Oh well..

Yea, MINI will bring up the numbers if I let it sit still and overheat and wait to listen for the fan to kick in, which means it has to idle for 20 mins after it reaches normal temp, correct? All my neighbors will go crazy until I figure it out. I was kind of hoping that it would be one of these well known issues for the little buggers
It sounds like temp sensor, the fan temp sensor not the temp gauge sensor, is faulty. A/C on will activate low speed fan regardless of eng temp, so no overheating unless in very high amb air temp when the eng temp sensor would then kick in the high speed fan when eng temp goes above the target temp. Without the eng temp sensor working you only get cooling from forward movement of car or low speed fan due to A/C. A/C on only activates low speed fan.
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  #1430  
Old 10-27-2017, 03:04 AM
TBeast TBeast is offline
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Quote:
Originally Posted by LAHills View Post
It sounds like temp sensor, the fan temp sensor not the temp gauge sensor, is faulty. A/C on will activate low speed fan regardless of eng temp, so no overheating unless in very high amb air temp when the eng temp sensor would then kick in the high speed fan when eng temp goes above the target temp. Without the eng temp sensor working you only get cooling from forward movement of car or low speed fan due to A/C. A/C on only activates low speed fan.
Hi, thanks for that. Where is the fan sensor? Is it replaceable? Never thought of that but sounds like it's worth a try.
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  #1431  
Old 10-27-2017, 10:41 AM
LAHills LAHills is offline
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Oops, just looked it up. I take it back. There is only one sensor, it inputs to the DME (digital motor electronics control unit). That drives both the temp gauge and decides when to turn on the low fan or high fan. The A/C has a pressure sensor on the freon line and that also goes to the DME and triggers the low speed fan regardless of temp. I'm going to look back at your posts and re-think this.
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  #1432  
Old 10-27-2017, 12:08 PM
LAHills LAHills is offline
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So looking around I found something I did not know, maybe you already did. But anyway, other posts report that the stock temp gauge is not linear. It stays at the mid (normal) point thru a wide temp range and only moves up when the temp has gone above the high speed fan temp point. So maybe with the chronopack you are seeing the engine move through its normal temp range. Engines do not actually sit at one temp all the time unless moving constantly at a speed high enough and at a modest and constant engine load. Once at fully soaked in at the thermostat temp the temp will go up from that and then back down depending engine load/fuel burn and on air flow through the radiator. At speed no fan is necessary with the high air flow and temp will sit at the thermostat temp. But at stop or low speed the temp will rise to the low speed fan point when it will turn on and if the temp rises some more then the high speed fan will come on. That is to say there is not one 'normal' temp and anything above that is abnormal or 'overheating'. With A/C on the low speed fan will stay on continuously replicating the car moving at a modest speed but more than 'stop and go', and so the temp will remain at the thermostat temp (so called 'normal'). So maybe it is just the chronopack is showing you what was going on all the time and is normal you just could not see it with the stock gauge. Per the Bentley manual low speed fan is tripped at 221F and off at 214F, high speed at 234F and goes back to low speed at 227F. And stock thermostat is 195F.

Last edited by LAHills; 10-27-2017 at 12:19 PM.
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  #1433  
Old 11-01-2017, 02:50 AM
TBeast TBeast is offline
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Thanks both, it seems the low speed fan kicks in at 221F. So I now need to address the A/C issue
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  #1434  
Old 11-08-2017, 07:25 AM
Caterpillaraoz Caterpillaraoz is offline
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Hey! I'm having the same problem and I'm wondering..... Apart from the noise, will there be problems if I just bypass the broken resistor with a short circuit, effectively making the fan start on "fast" even when it should be at "low"?
The only thing I can think of is some "too fast temperature transient" but not much else....
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  #1435  
Old 11-08-2017, 09:44 AM
LAHills LAHills is offline
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Just jumping from the low to the high speed wire will not damage anything. But it will put extra wear on the fan motor. The low speed handles cooling under all but the most extreme conditions so ordinarily the fan is sort of taking it easy. So wear is minimized. Adding the resistor instead of a wire jumper is not that hard.
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