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Need more information Posted by Ari [Email]  (#2847) [Profile/Gallery]
(more from Ari) on Wed, 20 Dec 2000 15:38:18
In Reply to: heater problems, bill burke, Mon, 18 Dec 2000 23:48:57 Members do not see ads below this line. - Help Keep This Site Online - Signup |
First off, what is the year of the car (I assume it's a 9000), and does it have the manual (with knobs) or Automatic Climate Control (ACC) system? Next, is it the heat that isn't being controlled, or the blower fan?
If the heat is full blast no matter what you do, there are a couple of possiblities.
The heater core always gets hot coolant through it. Temperature is controlled by a (mixing) flap that mixes cool outside air with heated air. If you have the automatic system, it may be holding the flap in the hot position because the servo is stuck, the connection from the servo to the flap fell off, or the cabin temperature sensor has failed and is telling the ACC that the cabin is too cold, even if the plastic is starting to melt.
If you have either the manual or automatic system, the most probable reason is that the arm to the mixing flap has broken. The flap falls one way or another. Usually it goes full cold in winter, and full hot in summer, but you may be lucky. This is common enough that Saab sells a repair kit (called the mixing flap repair kit) for the princely sum of about $8. This works if the arm has broken near the top. If it has broken near the shaft, the flap must be replaced, which is an expensive job.
To check the arm, you must remove the 'aquarium' cover. Open the hood, and you'll notice a (horizontal) plastic cover at the base of the windshield. On older (pre 90 or so) there are two covers on either side of the air intake grill. On newer cars there is just one cover that runs full length. You need access to the passenger side (US - right hand side facing forward) cover. On older cars this is two screws and some clips. Look on the right side of the blower motor/heater core (the thing with the plastic grill) - you'll see a shaft coming out horizontally, an arm sticking up, and a stiff wire going into the firewall. If this arm is broken, then that's your problem.
Good luck!
, Wed, 20 Dec 2000 15:38:18 <-- Viewing This Message
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