January 21, 200917 yr other than a head gasket...what could cause this: Temp ranges from normal to just below red...it rises and falls rapidly....the more you drive usually its lower...the more you idle usually its higher...blowing cool air through vents unless engine is revved then blows hot and normal??? Maybe air in the cooling system?? bad rad cap?? Cory
January 21, 200917 yr other than a head gasket...what could cause this: Temp ranges from normal to just below red...it rises and falls rapidly....the more you drive usually its lower...the more you idle usually its higher...blowing cool air through vents unless engine is revved then blows hot and normal??? Maybe air in the cooling system?? bad rad cap?? Cory I would add bad thermostat and bad water pump to the list! Prolly, more emphasis o bad thermostat.
January 21, 200917 yr Burp the system first to make sure there is no air bubble. +1 on the thermostat, if you're going that route, get a genuine Subaru replacement. Radiator cap is cheap and should be replaced also.
January 21, 200917 yr Author yeah i replaced the thermostat about 5000 miles ago.....im gonna try a rad cap...i just finished flushing out the system so ive been filling it as it sucks it down...hoping its just an air pocket.... Cory
January 23, 200917 yr Author filled the coolant again and replaced the rad cap....comparing the old and new it really needed a new one... Problem solved Thanks Cory
January 26, 200917 yr yeah i replaced the thermostat about 5000 miles ago.....im gonna try a rad cap...i just finished flushing out the system so ive been filling it as it sucks it down...hoping its just an air pocket.... Cory Hope you used a Subaru Thermostat. If you didn't, I would seriously go get one and yank that stant crap out of there. The Suby stats pull open almost twice as far to allow more flow. Plus 1 for burping the system really good. No heat out the dash vents is a sure sign of air in the system. Edited January 26, 200917 yr by Gloyale
March 9, 200917 yr Author just to wrap this up....i had a crack in the plastic coolant housing in the radiator...sucking up air and creating an air pocket....a new radiator fixed the problem...
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