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Old 10-25-2012, 01:26 PM
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snrusnak snrusnak is offline
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Did you top off the reservoir?

When the coolant in the radiator gets hot and expands, it builds pressure. At a certain pressure (~14psi IIRC) the radiator cap has a valve that opens and relieves pressure/coolant into the expansion tank(the tank you're talking about). Once the coolant begins to cool down it sucks the coolant(siphon effect) from the expansion tank back into radiator. This system works very well, it keeps the cooling system full(with no air in it) at all times.

This is different than an overflow tank.

If you overfill the expansion tank all the way then when the coolant expands and leaves the radiator it will overflow from the expansion tank(there is an overflow drain). If you under fill the expansion tank you might get some air being sucked into the radiator as the coolant cools and retracts.

Not sure if this is your issue, just giving you some info...
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