I have a mini cooper s and it is overheating. it only does this when i am in traffic and if i dont have the heaters on. I have had the thermastat changed but this has not worked. The Auxhilary fan is working (we did some checks) however it doesnt work by itself. I am at the end of my tether with it now does anyone have any ideas?
I have a 2003 Cooper S that has the same problem. I've replaced the thermostat, checked that the radiator isnt blocked. The fan goes through the 2 stages mentioned by UCMOE. No coolant leaks either.
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Clarence, your mini-cooper may just need a new thermostat. if the thermostat in your car is the original, then 4 years is a goodly amount of time for any thermostat to last. Thermostats fail in 2 ways: (A) stuck open, which causes engine to warm really slowly, and (b) stuck closed, causing overheating and causing the heater to blow cold air - since the heated coolant can't get past the closed thermostat to circulate through the heater core (a small radiator-like device used to heat the interior of your car). Your car's thermostat has failed in mode (B). Your cost: $5-$15 at any auto parts store. Project complexity: any handy person could teach themselves to replace a thermostat.
Hello, kerotse and thank you for asking your question on Fixya!
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I had this exact same problem -- for about a year and a half! Replaced thermostat, replaced sensor twice, replaced overflow tank, replaced radiator cap, placed a grounding kit on the car in case the problem was electrical ... and was ABOUT to replace thermostat again and then the water pump when a new mechanic suggested we bleed air out of the cooling system. The heater core was PACKED with air, as was the upper hose valve area. Previous mechanic had been using a pressurized fill device to bleed the system and this had just been backing air into the heater core. There are two valves under the hood for bleeding air -- one on the heater core and one on the upper hose. It only takes a few minutes to fix this!