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Re: Coolant leak in Throttle body? (archive)

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Posted by moots on October 18, 2001 at 04:40:01:

In Reply to: Coolant leak in Throttle body? posted by Randy on October 17, 2001 at 12:11:32:

The coolant acts as a heater.If you have a close look at the TB you will notice small "fins" on it.This is to ensure that the throttle valve inside does not get iced up in cold weather and seize the valve from closing when the accelerator is released.

moots '90 520i

My son just bought a '90 525i (M20 engine) that had the two coolant hoses that should go into the throttle body connected to each other, by-passing the TB. Figuring that configuration would not pass CA smog, I hooked them back as they should be. Now the radiator is nearly empty. Why does coolant run through the throttle body and what is the fix for the leak?



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