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Q: I am having coolant blow back in the reservoir & running hot. on 1999 Volvo V70 XC

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Coolant blowback in reservoir, running hot. There is a crack in the reservoir. I have another reservoir on the way. I have changed the thermostat & I am noticing moisture in the exhaust. Does this mean I have an internal head gasket blown or could it be just the coolant reservoir?
(2) Answers
It's normal to have moisture in the exhaust, especially when the engine is warming up. If you see white smoke from the exhaust, then this could mean a leaking head gasket.
A leaking reservoir could conceivably cause the engine to run hot and boil over, but I suspect the head gasket is leaking.
I would have the cooling system checked for the presence of hydrocarbons (indicating a blown head gasket)
Good Luck
Im in agreement with Bret I would suspect a blown head gasket. Replace the resorvoir and cap and if it still pushes coolant out and/or overheats start looking toward a head gasket replacement.
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