1990 900S - Heater works only intermittently - SaabCentral Forums
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Old 10th September 2004
g10sha g10sha is offline
Junior Member
Join Date: Sep 2004                                                
Location: San Francisco
My Saabs: 1990 900S
Posts: 18
Default 1990 900S - Heater works only intermittently

As the subject says, the heat works only intermittently. When it blows hot, it is really toasty. However, without touching the thermostat, the air will suddenly go cold.

Any ideas, or known issues?
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Old 12th September 2004
Oil_Eater Oil_Eater is offline
Join Date: Mar 2003                                                
Location: CT
My Saabs: 1991 SPG Berol Green
Posts: 423

There is a brass coolant vent where your upper rad hose meets the block. with the engine hot and running, slowly open the vent to allow air to escape. Be sure to watch your coolant expansion tank level while you are venting air.

If this doesn't help the problem, you may need a radiator flush to properly open the passages in your system again.

Good luck,
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