The engine is definitely overheating and seems there are air in the system. Did you bleed the system after replacement of the thermostat?
When engine is cold, remove the radiator cap and check the coolant level. If it is low, loosesn the bleeder bolt on top of thermostat housing and fill coolant till no bubbles overflows. Tighten bolt and top up at radiator cap. Turn on heater to maximum and start engine without the radiator cap.
When coolant level drops, top it up and continue running till the level stays constant.
If the coolant in radiator is not moving when thermostat has opened, the problem could be a faulty water pump.
If the level maintains after some time and you keep getting air bubbles, the most likely problem would be a bad head gasket.
If level remains constant and no bubbles are noted, close radiator cap and restest. Top up reserve tank if necessary. If it is overflowing most of the time, either the head gasket or radiator cap is bad.
Sunday, July 19th, 2009 AT 1:33 AM