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Heater control valve likely... (archive)

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

Posted by Jeff N. on September 28, 2001 at 10:55:48:

In Reply to: Faulty heater control valve? posted by David Vukovich on September 27, 2001 at 23:28:59:

Likely have a stuck solenoid in the HCV, especially if the heat is stuck on one side or the other.

It's not to hard to change the HCV. Bentley's has a good description. Basic tools are fine, top of engine compartment, a little tight so be patient. Be sure to remove/replace the HCV and aux pump as a unit. Note that you don't have to drain cooling system as they suggest. Have several (4 i think) wine corks and just plug the lines as you undo them.

I purchased a used HCV for $70, a new one was like $135 or something. Unlike the E28 unit, you cannot rebuild it.

Cheers!

Jeff
90 535i


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