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Old 12-04-2012, 08:47 AM
SFbay SFbay is offline
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Location: SF
 
Join Date: Mar 2012
Posts: 893
Mein Auto: BMW 745i
Quote:
Originally Posted by DFEL750I View Post
Yes. Our thermostat will fail open to prevent overheating. Also when the car is cold and therefore coolant is cold there is no need for the thermostat to be open to run coolant through the radiator. If no coolant is being run through the radiator then there wont be any coolant flowing into the expansion tank.
-1 wrong. Check how your radiator is built my friend even with small loop it still goes through small radiator loop which cools tranny and alternator
So when your car is cold and you can see a coolant flow from small hose it's totally normal, and is not that good if you don't have it, bc it means coolant pressure loss either bc of waterpump or some leak
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