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Overheating problem, everyones help needed (archive)

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Posted by brian on June 09, 2001 at 07:11:52:

Hi all,
I own an 1987 E30 M3 which has persistant overheating problems. My E30 has a thermostat at the bottom left of the radiator. It started two years ago when the fan did not kick in. I changed the sensor on the bottom left of the radiator and since that did not help, I changed the big three way heart type valve thing! The problem still persisted. I then moth-balled the car for near on two years (I had other commitments. Its only now that I'm getting the car sorted out. A local mechanic checked it over and advised that it was the radiator sensor and he replaced it. Based on that thinking the problem was sorted, I moved the car on to a specialist who has refreshed the head fitting Shrick cams :) and given that the car is 75k miles I've had the chain set replaced. With a new set of Bridgestone s02's I picked the car up this weekend. I drove it around Friday with no problem but today, sitting in traffic....the car temperature started rising. AHHHHHHHH

Has anyone any ideal what the problem is? The lower radiator sensor does not seem to cut in. If I short across the sensor the fan runs constantly as you would expect. The sensor has been changed a few times now. Could it be that the hot water is not reaching the sensor? Is the sensor not the problem.
I need you expert help chaps.



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