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All m20 motors have this. More. (archive)

[ Follow Ups ] [ 5-series (E34) Message Board ] [ Msg. Board FAQ ]

Posted by funfer on October 17, 2001 at 17:37:01:

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

It is there as a heater for the TB. It acts as an air warmer for smog purposes. May also serve as a de-icer for cold climates.(?)

Anyhow the two protrusions often get crudded up and over this residue of engine coolant will corrode the aluminum. I have seen this occur at the TB as well as the thermostat housing. I have found holes where the corrosion has eaten all the way through the metal. So it could be very possible that you have a leak there...which is why the TB was bypassed. I wouldn't mess around with this thing. Before you know it a head could be cracked or warped. You may pick up a good TB at a junk yard for $20.


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?

Thanks

Randy





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