Hi, I have a 02 Mini Cooper recently purchased from a private seller but i have started noticing slight problems with the fan and coolant levels.
It started off with the car blowing cold air in the interior and the coolant levels dropping and the 2nd stage fan staying on for about 10 mins after the car was turned off. My first trip to the mechanic concluded that it was the radiator cap that was not holding the pressure and leaking out of the cap, so got that replaced for around £10. After that the car was running fine for a couple of weeks.
Now the problem has extended to the radiator fans not coming on at all, causing the car to overheat when stationary
Went back to the mechanic and he goes that it may be an electrical fault as the stage 1 fan is not kicking in, however the 2nd stage works. Suggested that I replace the whole fan unit or wait 2 weeks for the electrician to come in (not a possibility, cant be off-road for 2 weeks!)
So i made a trip to a local breaker who had the correct part available for £20, however before I bought the part I plugged the fan in to see if it would work(externally) but no joy, fans didn't turn and the engine was running hot. The breakers told me that it may well be the fan switch which is mounted to the head, however that would cost a bomb of labor to replace.
Now I'm not sure what to do, I don't want to waste money on repairs that are not necessary, so any advice on this would be greatly appreciated
As for you temp gauge it sounds like you have a problem with your OAT probe you may have a bad connection of some damaged wires, it's behind the front bumper right hand side as you look at the front of the car. You will need to pull the bumper off.
I take it your mechanic has tested the low speed fan wiring fuses and relay.
Simple and quick to do. Disconcert the black plug for the fan ( left hand chassis leg near bonnet release) there a three wires in the plug one is earth (brown) and the other two are power to the fan one is high speed red/blue 4mm cable) and one is low speed (red/blue 2.5mm cable). Run the car till the first stage is meant to cut in, if you have voltage between earth and low speed fan power your good
If the above is ok and the second stage fan work it's only the resistor
Just replace the resistor it's a very simple job it will take about 1 to 2 hours
You have a few choices as I said above or you can buy these
I went to a more reputable garage who suggested that the Fan Switch was faulty. Got that replaced (cost me £60 altogether) and now only the 2nd Stage fan kicks in. This happens rarely but it seems to have fixed the problem.
It only kicks in if the weather is hot (rarely is in the UK ) and I'm stationary for more than 10 minutes. Hasn't caused me any problems and it has been running fine for about 3 months.
It's difficult to say, but it may lead to problems later.
The low speed fan comes on at 105C but the high speed fan does not kick in until the engine gets hotter (112C). The idea is that the low speed fan kicks in to keep the temperature below 105C. The high speed fan should only be needed in exceptional conditions.
Without the low speed fan your engine will be running hotter and the cooling system will be under greater pressure.
Additionally the low speed fan is used when the AC is on to draw air through the AC radiator so this may not be operating optimally.
Personally I would get it fixed to avoid the possibility of it causing problems later on. As marque says it's a relatively easy job to do.
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