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In Reply to: Jens, others - help - bad HVAC solinoid? posted by Walter OH 84/733i 87/325i 83/635csi Euro on August 18, 2001 at 17:05:53:
Pretty well maintianed and garaged most of its life.
I've been over most of the AC components (rebuilt the push buttons, put new brushes in the blower motor) and it normally works well. Jens told me that when it occasionally got confused and went click, click click for a while - it was the solinoids behind the ashtray.
It is now stuck in the default defrost mode, even though the other green leds will light DIMLY when selected.
Vacuum leak checked out no problem, passed leak down test and would hold 450 millibars at idle.
When I turn the fan thumb wheel up higher, the green led selected (like auto AC) gets dimmer. The blower only runs at part speed. The brain box doesn't shift when I change temperature selections or push different buttons.
If its a burned out solinoid, could this be causing all these problems? How do I get to them and whats the best way to test them? How do they actuate that wierd mechanical brain box by the driver's feet?
Any help or suggestions welcome.
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Walter,
I sent you a HVAC diagram for your car in an email earlier tonite. If the blower is only running at part speed and does not respond to thumbwheel input try checking the compressor relay mounted to the right side of the blower housing under the cowl cover. This relay must be good for the blower and the HVAC system to work properly. I chased my tale last year on my '86 735 and the relay was the culprit. Since changing the realy I have not had any problems. Low blower speed and no response is a good clue even in default defrost mode which overrides all the controls only when this relay is good.
Good Luck,
Tom M in PA
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