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I over heated the engine.I had the cylinder head removed and reconditioned, pressure tested, new rings,new fan censer fitted. header tank replaced etc.(no evidence of blowen gasket) Now after about 20 to 30 klms the engine over heats, the fan did not kick in. So I let the engine cool down, topped up the water and nursed the vehicle home. Now, while checking the engine in my garage at home the fan started to kicked in. Please can you help? Does the water system have to be bleed of air?

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If this ever happens again turn the internal heater to full, it helps in the cooling. When filling the engine with coolant the heater should be on full. As the engine warms squeeze the top radiator hose regularly to encourage air bubbles to shift to the expansion tank. If the coolant level looks low after the engine has been brought to full running temperature and air has been purged from the system then top up with additional coolant. Note that the signal to run the fan is sent by the coolant sensor, if the coolant is low the sensor cannot function. Check your engine error codes, sometimes if the coolant sensor cannot detect normal running temperature (perhaps due to low coolant level) the engine is unable to enter closed cycle mode and reports p0125. Closed cycle is the normal running state of an engine at normal running temperature; open cycle denotes the times when the engine is cold such as at start up or when the engine is under load such as when accelerating hard.

Posted on Apr 03, 2011


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