Went to the dealer tonight for the coolant leak. Says its the head gasket is gone. I'm pretty good wit doing repair but how can a head gasket have an external leak? If I do a compression test what should I look for? Can the gasket have an external leak and not internal? Any sugesstion would be great. It seems the coolant is coming out of the side of the engine near the water pump hose and drip onto the a/c compress and falling on the floor. Would raly appreciate any input he dealer want $1600 for the repair

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