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Old 4th April 2010, 22:16   #18
T-Cut
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Rover75 and Mreg Corsa.

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Quote:
Originally Posted by markb63 View Post
when I remove the expansion cap to check the coolant level in the morning I get a hiss of pressure relief on a stone cold engine, so the system must be ok.
That doesn't sound so good to me to be honest. A stone cold engine cannot have residual pressure in the cooling system unless it's permanent gas that's been put in under pressure. That means a gas like CO2, in other words, exhaust gas. It would explain all your overheating/bad circulation issues.

TC
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