My car overheats after 20 minutes in idle and it appears to leak from underneath the throttle body unit. I removed the large coolant hose that connect to the housing unit to the fire wall and it appears fine. Is there another coolant hose around that area? Is there a diagram somewhere online that shows all of the hoses for the coolant system? Thanks.
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1990 BMW 325i Question: Coolant leak
Answer #1Chow July 07, 2010, 02:14Master
If coolant appears around the throttle body, that is where i would typically be looking. There are a couple of coolant hoses to the throttle body prone to leaking due to corrosion and worn hoses, there is also a spout at the back of the head which also leaks
The car will overheat due to a few things, most likely suspects are blocked thermostats, free spinning water pumps, faulty viscous fan, faulty thermofan or fan circuit or a blocked radiator.
Head gaskets can also causing uncontrollable overheating.