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.
Coolant leak on 1990 BMW 325i
by baseballpilot22 in Panama City, FL on July 06, 2010
ANSWER by Chow , July 07, 2010
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.