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Re: Heat only on Hi Posted by Ari [Email]  (#2847) [Profile/Gallery]
(more from Ari) on Thu, 31 Oct 2002 11:50:57
In Reply to: Heat only on Hi, Brian Z, Thu, 31 Oct 2002 11:32:02 Members do not see ads below this line. - Help Keep This Site Online - Signup |
The servo is mounted behind the dashboard. To access it, you remove the glovebox, and look immediately to the left.
Before you do that, do some simple checks. First, open the hood and remove the horizontal plastic cover at the base of the windshield, on the right-hand side (facing forward). Sticking out of the heater core/blower motor box is a shaft with an arm, and a piece of piano wire from the arm going straight back through the firewall. The servo is at the other end of that wire.
With the cover off, engine running, set the ACC temp to LO. The wire should move, pulling the arm. For the life of me, I can't remember which way HOT is. Then set the ACC temp to HI. The wire should move to a new position. That's the swing between full hot and full cold. Push and pull on the wire - there should be no play. While watching the arm, have someone set the temp down a notch at a time. The arm should move.
There are a couple of possibilites here. One is that the servo is bad, but I doubt it. It usually either moves or it doesn't. The servo is rotary, and it has a metal arm on it, and the wire's at the end of the arm. I've seen problems where the arm gets loose on the servo shaft, and that play makes for big problems.
The last one is trickier. The servo is just an electric motor through a reduction gear train. There is actually a position feedback on the servo that the ACC uses. If that feedback gets screwed up, it won't control the heat properly.
Run the self-test, and see what codes you get. Check out my old post at http://www.saabnet.com/tsn/bb/9000/index.html?bID=73608
and see if that helps.
Good luck!
posted by 192.249....
, Thu, 31 Oct 2002 11:50:57 <-- Viewing This Message, Thu, 31 Oct 2002 13:15:24
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