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Troubleshoot Overheating for 1992 Saab 900 S Convertible
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Posted by Michael Brady [Email] (more from Michael Brady) on Sun, 26 Jul 2020 15:55:12 Share Post by Email
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Recently purchased the classic 900 and noticed that it overheats during stop and go driving, up to about 3/4. Highway driving will get the temperature back to about midway. This occurred last during night driving in ~85 F air temperature.

The car was delivered with an empty coolant tank due to a damaged hose. The hose was fixed and the coolant level has remained stable; no visible signs of leakage.

Passenger side fan activates after the car heats up, and both fans activate immediately when the a/c is turned on.

Radiator hoses appear in good shape; no signs of leakage. The passenger side hose heats up when the car heats to normal temperature (midway), and the driver side hose remains cool to the touch. The top part of the passenger side hose gets very hot, much hotter than the section of hose connected to the radiator.

My first thought is to replace the thermostat.

Thoughts and suggestions on what the issue is and how to troubleshoot?



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