On my 2005 audi a4 1.8 turbo
There"s air bubbles in cooling system coming out of the coolqnt reservoir, the car starts fine and it runs fine, no overheating, i ran a compression test and the compression is ok, theres is no signs of cooolant in the cylinders or on the spark plugs, computer doesnt register any fault codes, if the sits there for a couple of days it has a hard time starting but runs fine after it starts, theres no white smoke coming out of tail pipe. I checked all the basics as far diagnosing a bad head gasket is there anything else that can cause the air on the coooling system,
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