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#6: 11-15-2012, 06:20 PM
Title: Junior Member
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NO, there is not a pressure relief valve. That is pretty much the function of the overflow bottle.

With a 1.8 you can do the HG's pretty easily with the engine in the car. If you aren't convinced that you have a HG problem, you could check your compression, or maybe a leak down test would be more telling.