Hi Everyone :).. I have an Audi A4 2004 and its been diagnosed with a head gasket leak.. Now unfortunately, the car won't start. Any ideas why that would be?

Asked by Apr 26, 2014 at 02:03 PM about the 2004 Audi A4 1.8T

Question type: Maintenance & Repair

I had just bought this "head gasket sealant" and was planning to try that first before
completely repairing the problem.

2 Answers

70,295

If the engine won't crank most likely one or more of the cylinders has coolant in it. This hydrostaticly locks the engine since the coolant can't be compressed. You'll need to remove the spark plugs then crank the engine to get the coolant out of there. The only stuff I've seen work for head gaskets is a product called Blue Devil. BUT you must follow the instructions on the bottle EXACTLY! Other products will clog up the cooling system and create other issues such as no heat, overheating, etc. HTH. - Jim

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10,445

do your self a favor don't even bother with that head gasket sealant. the audi's engine runs to hot for it to be any real use. What you need to do is have the head torn down and replace it with an either original or after market gasket. tho i recommend getting it from audi. When it comes to the cooling system in an audi it is very important you fix it properly or you risk not having an engine at all. thats the risk with high performance engines. if this were a gmc or ford i would say go ahead do what he said and seal it but its an audi and doing a half arsed fix only causes more issues and more money spent

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