Coolant might be OK, but thermostat or cap?? - Saab 900 Bulletin Board - Saabnet.com
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Coolant might be OK, but thermostat or cap??
Posted by JohnK (more from JohnK) on Tue, 6 Nov 2001 13:04:11
In Reply to: Need to change radiator fluid..How???, JonG, Tue, 6 Nov 2001 00:24:48
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Just having the coolant spill out the expansion tank should not be a problem by itself. However, even if you fill it to the max line when cold, it should not boil over. I suspect that your expansion tank cap is leaking and not properly pressurizing the system, hence 3/4 gauge reading. I would replace the cap before your trip and make sure that your cooling fans come on at about 3/4 gauge and cool you down to 1/2 when they shut off. On the road the gauge should be at 1/2 or slightly less with no need for fans. If reading is erratic, you might need a new thermostat.
The coolant mix is not nearly as critical as lack of pressure in the system, a bad thermostat or bad fan switch. Replace the coolant when you get a chance.
posted by 216.75....
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