Question about 1997 BMW 328

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OVERHEATS IF SITTING STAYS OK COOL IF MOVING OVER 40 NO HEATER FA

OK HERE IS THE SCOOP..my heater fan stopped working and the car ran very porrly all of a sudden when cold in the monring ...then it overheated ...i had replaced the thermostat (bmw part) 6 months ago anyway took the thermostat out completely and even in the sub 32degrees weather 24/7 here the last 2 weeks the car still will over heat if sitting still but wont if cruisning over 40mph. in sub freezing weather is the thermostat that important?? also stupidly never considered the water pump as the problem ... the radiator builds up pressure when hot alright (look like old glory steaming thru the overflow area) i plan on putting the thermostat back in it today ...how do i tell if waterpump is problem?? makes no noise that i can hear ...also what about the heater fan ?? unrealted ?? resistor? help!!

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  • roadloans Jan 04, 2009

    There doesn't appear to be any other indications of a hea gasket problem ...(or a cracked block) Standing there trying to figure out what the problem was i discovered that none of my fans kicked on at all ...you know the two fans that **** cold air through the two holes in the front of the car ?? with no thermo and no fans kicking on at all ....if that car were to sit for very long it would over heat ?? yes?? Also I think that after reading a couple of other posts here that my heater fan issues may be a fuse,.... which I plan on checking this morning any thoughts gurus?

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You can check if the water pump is working by feeling the top rad hose , if it is hot it should circulate into the rad and the rad should be hot at the top and cool at the bottom if the pump is faulty there will be no circulation of hot coolant into the rad. I suspect your head gasket might be blown if you are getting pressure built up in the rad. in that case you will need a new gasket and have your head skimmed

Posted on Dec 23, 2008

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