8 replies to this topic

[rubdub]

Hey guys,

 

I've a 98 MPI which has developed fan issue, where it stays constantly on.

 

I've seen a couple of posts on here which diagnosed it as either dodgy contacts or a dodgy loom.

 

I'm going to pick up some electrical cleaning spray today and give that a blast, but wondering if anyone has the link to the new loom on Mini Spares, all the links in previous posts seem to be expired.

 

Also, with the fan being constantly on, would this be a reason for the Mini running rich? Getting a very strong smell of petrol the last couple of evenings.

 

Cheers! 

 

Vinny

[minidaves]

Running rich is is possibly down to the same thing, temp sender or wiring fault, they also seem to be doing ecu's too

[rubdub]

It's also squealing on cold starts, which I originally put down to a loose belt.. but now it's making me think it could be the water pump...

[Steve220]

Coolant temp sensor is faulty. Fan will come on constantly and the ecu will set the car to rich to compensate for unknown quantity.

Tighten the belt via the alternator. Or replace the belt and tighten it properly.

2 simple fixes :)

Edited by Steve220, 30 October 2015 - 08:55 AM.

[rubdub]

Cheers lads! 

[orcadian]

Dirty contacts on temp sensor would prevent fan coming on at all. The sensor is a negative coefficient type which has a falling resistance as temp rises, when the resistance falls below a set level the ecu switches on the fan. If the fan is always on then the resistance the ecu is 'seeing' must be below this level. I think the nominal cold resistance is around 1200 ohms, If it reads infinity - open circuit, the fan will not come on, so it must either be zero- shorted internally, which does happen but rarely or normal then the fault would be in the two wires to the sensor. If the reading is normal, then it must be the wiring and very easy to check by stripping back part of the loom in that area. That little piece of loom was badly designed and has a hard time with heat and being too short in length is prone to this fault. Couple of bits of wire and a soldering iron, some heat shrink sleeving, looming tape and half an hour will fix this problem, don't be tempted to use scotchlocks or twisted wires, they will come back to bite you at the least convenient moment.
Ian

Edited by orcadian, 30 October 2015 - 12:27 PM.

[FlyingScot]

The minispares loom part was the recall/update version of that part of the loom which as Ian has pointed out above was too short in the original fitment. This works for a lot of problems simply because it is replacing a damaged section of loom.

FS

[jamesquintin]

I had the same problem and fitting the Rover recall section from Minispares fixed the problem for me

[Alpenflitzer]

Squeaking fan belt: If there is a little humidity overnight next morning it will squeak. If the belt is not lose try an anti-squeak spray for belt or chenge the belt. If the belt sides have gone hard it my also squeak.