Mechanics

EXPANSION TANK STEAMING

1999 SAAB 9-5

Engine Cooling problem
1999 Saab 9-5 6 cyl Two Wheel Drive Automatic 94.000 miles

Hi there, hope you can help.
A couple of times over the last few weeks steam has been escaping from the expansion tank and the water in the tank itself is boiling. This stops as quickly as it starts and it doesn't seem to matter how long the car has been run for or how hard it's been driven. The temperature guage remains half way between hot and cold which is it's normal operating zone. Any thoughts?
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Zac5150
September 15, 2008.



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