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Discussion Starter #1
There is a service bulletin out on it and the dealership has purged the air 4 times already and it goes away slightly for awhile and then comes right back strong again
 
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I would say you have a hose that is slightly loose. On cool down the cooling system sucks air back into system causing an air pocket. Have fun, these suck, welcome to my world.
 
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My 99 Buick Century has always done the same thing since 1999. I just always thought it was normal, since I have had no Problems with it.
 
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