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"I have been reading about a tester that can tell you if there are exhaust gases in the coolant and am consdering buying one to confirm once and for all that I have a blown head gasket."
A persistant white exhaust cloud AND mysterious disappearance of a lot coolant - a litre per day will not leak away unnoticed UNLESS it's going into a cylinder.
By all means buy the head gasket leak detector kit, it should set you back only about 50 USD and give you the final confirmation. Doesn't your mechanic friend own one?
It shows by pulling air from the coolant reservoir through a fluid if there's CO2 present in the coolant. If there is, then the fluid changes colour and the head gasket is leaking into the coolant system.
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