Question about 2001 Saab 9-3

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I have a SAAB 9-3 2001 which the heater is constantly on hot even when the knob is pointing to cold, the knob has little to no resistance when turning. the heater worked fine but the car was off road for niine months and when I got it bback on road the heater had stuck on hot what could this be

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If the heater controle is manual its more than likely come off the other end in the dash, remove the switch and see if the arm behind it is loose, on 900ds we used to remove the top speaker to get in there on 93's i think you can remove the front of the dash to see however iv not done it on my 93aero as its done with buttons, hope this helps

Posted on Oct 24, 2010

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Unless you have symptoms of over-heating, I rather doubt that your water pump is a problem. I recall that my water pump had a metal impeller (1992 C900); I haven't heard of a plastic impeller on a Saab pump before. (Most pump failures are the bearing seal, and the pump leaks coolant) If your temp gauge is slightly low (and was OK before) I'd rule out water pump issues.

You might have one or more of the following issues:
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  3. has your rad and heater core been flushed recently? If the heater core is obstructed flow will be reduced and the heater will run cool. Feel the rad and heater hoses when your engine is warm; if heater hose is much cooler than rad hose with heater temp set to max, then core flow is likely restricted, or valve is not moving much from the shut position.
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  5. Lastly, the shaft connecting the temp control knob to the valve behind it may not be properly in place. This can be inspected, and adjusted if necessary, from the speaker/vent cutout on top of the dash. Make sure you re-connect the black flex hose to the air vent tube, or you'll get no defrosting afterwards!
  6. remember, the centre vents always blow cold air; a brilliant idea from Saab so the driver (and passenger) can get fresh air in the face and stay awake while the rest of the driver, passenger and car is toasty!
  7. see http://townsendimports.com/Web/cooling_system_folder/thermostatreplacement.htm for flushing and stat replacement info

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