BMW/Z3 1998 Over Heating
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Question
I have an overheating problem with Z3 1.9. I changed the radiator and the thermostat, still overheating. The fan is not coming on but works if I bypass it.
Joe,
Is the problem the fan? If you bypass the fan, does the car still overheat? If you have changed the T-stat, then the water pump is the only culprit left. I know on some of the Z3's the impeller's were made of plastic, and they would crumble to pieces after a few years. This would leave you with a water pump that doesn't pump water.
I would check this as my next step, and make sure to bleed the system correctly, or it will over heat again.
Good luck,
Josh
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Josh Fields
Expertise
I can answer questions related to the BMW e30. These are the cars produced from 1984-1991 (1992 for convertable) in the United states. I am more fluent with the six cylinder models, although few things changed for the 4 cylinder cars. I know most of the problematic areas of these cars, and have found ways to fix them.
Experience
I have owned six different E30's over the last 10 years. I do all my own work, and know about ever nut and bolt on these cars.
Organizations
BMW Car Club of America
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