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Discussion Starter · #1 ·
Hi I have a 2004 (54) grand scenic 1.5dci which is creating air in the cooling system and causing the car to overheat I have changed the thermostat and drained and re bled the cooling system but with no luck does anybody have any ideas??
 
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If it's pressurising the system, it could be the HG allowing exhaust gases into the coolant galley.

Get a chemical test done to check if the gasket's gone.
 
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