I assume you mean the APC solenoid - Saab 900 Bulletin Board - Saabnet.com
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I assume you mean the APC solenoid
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Posted by Ari [Email] (#2847) [Profile/Gallery] (more from Ari) on Fri, 24 Feb 2006 07:57:27 Share Post by Email
In Reply to: chattering Solenoid, Zaab [Profile/Gallery] , Fri, 24 Feb 2006 07:27:19
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I assume you mean the APC solenoid mounted on the radiator.

The fact that it is chattering when the car is turned off means that you have a problem other than the solenoid. That solenoid gets power from the APC box, which should be unpowered when the car is turned off. The solenoid turns off when the brake pedal is pressed; that signal goes through the APC box, so it further points to some wiring problem.

You need to find out why the APC box is being powered with the car off. My guess would be a sneak path from some system that is powered all the time - an example would be the brakes or perhaps the parking lights. One strange possibility would be something through the parking lights AND a bad ground - if you hit the brake switch, do all the brake lights work properly, or do you get some weird combination of dim lights? If so, that's the classic bad ground at the tail lights.

But your solenoid is probably OK -you've got a sneak path in the wiring. It's probably a low current path. When the solenoid pulls in, this takes more current than the sneak path can provide, so the solenoid drops out, and the cycle starts again.

You could always try pulling fuses, one at a time, with the car off, to help localize the problem.

posted by 192.249....

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