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Re: Troubleshoot Overheating for 1992 Saab 900 S Convertible
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Posted by Cmyles [Email] (#1126) [Profile/Gallery] (more from Cmyles) on Sun, 26 Jul 2020 17:41:45 Share Post by Email
In Reply to: Troubleshoot Overheating for 1992 Saab 900 S Convertible, Michael Brady, Sun, 26 Jul 2020 15:55:12
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Test and replace the thermostat if necessary and make sure that the twin belts that drive the water pump (and alternator) are not loose. Sticking straight up from the thermostat housing (on the cylinder head) is a small brass vent for releasing air from the coolant system. Use two 11 mm wrenches (one to hold the bottom part and one to unscrew the top part) to open that and purge air. Be sure to do that. The short tube that interrupts the top hose and holds a temperature sensor switch to control the AC compressor control circuit is not prone to becoming blocked. Can't imagine why the hoses would be hot on one side and not the other?
I always test new thermostats in a pan of water on the kitchen stove with a thermometer since defective ones are not unheard of. You could test the current one like that.

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