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Why , Yes It Is (archive)

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

Posted by Jeff Bailey on September 28, 2001 at 11:05:36:

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

Definetly the heater valves. Mine wouldn't pop open until the motor hit 3000 rpm and then the passenger side would go great with little heat coming out the drivers side. After awhile, without warning it would go full hot, regardless of selector position. It would always do this whenever the engine was at 4000+ rpm constant(highway cruise)There are two valves in one assembly and is easy to change. They're on the left side firewall, nestled in a area surrounded by the fuse box and brake master cylinder. Drain the coolant about 1/2way and take the plastic cover(if it's still there!) off exposing the valves. There are three hoses attached. Loosen clamps and remove hoses, be prepared for some coolant to come out. Remove the three nuts that hold the valve assembly on the rubber bushings. Now comes the tricky part. Getting the valve assembly out isn't as straight forward as it would seem and you'll have to twist, turn, flip and otherwise contort the thing out. And now the famous phrase: "Installation is reverse of removal." Be sure to burp and bleed the coolant after filling and do it with the valves full open (hot). Check for leaks and check the orientation of the hose going to the resevoir, make sure it's not rubbing against the intake manifold. If it is, loosen the clamp and turn the hose 'till it clears. Took me about a half hour. Now play with the heat settings as you drive to enjoy the novelty (just kidding!) Hope this helps

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