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Re: heat always on (archive)
[ Follow Ups ] [ 5-series (E34) Message Board ] [ Msg. Board FAQ ]
Posted by Chip on April 29, 2001 at 21:57:05:

In Reply to: heat always on posted by alphotos on April 29, 2001 at 18:51:51:


I've just noticed that the heat is always on in the passenger side compartment. I was running my AC and I was getting heat from the floor vents and the vent by the speaker. Also, the vent the blows air to the through the door was working correctly.

Please help.

Thanks

sounds like a stuck mono valve.Mono valve shuts the coolant flow to either side of the heater core.In the RF of engine compartment on firewall near jump start location is the mono valve.It is an expensive piece(approx 150$)+the only way to test is with factory test harness.Try pinching off heater line from monovalve to core.


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