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Re: Absence of Heat Posted by Ari [Email]  (#2847) [Profile/Gallery]
(more from Ari) on Fri, 16 Feb 2007 11:56:21
In Reply to: Absence of Heat, Hondo, Fri, 16 Feb 2007 10:32:07 Members do not see ads below this line. - Help Keep This Site Online - Signup |
Possibly the classic broken heater arm. There is a servo in the dashboard that pulls/pushes on a stiff wire that comes through the bulkhead. This wire moves an arm sticking out of the side of the heater box. That arm moves two flaps inside the heater box, directing air over the heater core (or not).
In full compliance with Murphy's Law of Climate Control, if the arm breaks, the flaps fall to full heat in summer months, and fall into the full cold position in winter months. During spring and fall, the failure waits for the weather to change.
To check, open the hood. At the base of the windshield, remove the flat horizontal plastic cover. On the passenger side of the heater box (US cars, right side facing forward) you'll see an shaft coming straight out the side. It should have an arm on it, and on the arm, a piece of piano wire that disappears through a hole in the firewall.
First, make sure everything is hooked up. If the wire has fallen off the arm, re-connect it. If the arm is broken, well, that's the answer. If everything looks OK, have an able assistant switch the ACC between LOW and HI, while you watch the wire. It should retract into the firewall and push back out as the heat request changes (I'm never sure which direction it moves with hot and cold). If it doesn't move, pull on the wire to see if it is still connected. If it is connected and doesn't move, it's the servo. If it's loose inside the dash, go inside the dash and reconnect it.
If the wire moves, the servo is OK. It should be turning the shaft on the side of the box. If the arm isn't broken and the shaft is turning, then the shaft is broken internal to the box. It must be replaced, which involves replacing the flaps (two in an ACC II car like yours). Getting the box in and out requires a significant amount of work.
If the arm is broken off the shaft, it might be repaired. If there is some meat of the arm left on the shaft, Saab sells a Mixter Arm Repair Kit for a reasonable price ($8 last time I checked, a few years back) that splints the arm. It doesn't always work, depending on where the arm is broken, but it's worth a try.
posted by 192.249....
, Fri, 16 Feb 2007 11:56:21 <-- Viewing This Message, Fri, 16 Feb 2007 12:22:21
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