2006 equinox overheating at idle, fan is ok, thermostat replaced twice, flushed cooling system, bled air from system, seems to build up alot of pressure in system. When I bleed off the air in the system it seems to be ok for awhile. Haven't checked compression yet. I smell no coolant leaking, no coolant smell from exhaust, but the cooling system is drawing air pressure from somewhere. I have also changed the radiator cap.
1,you need to remove the radiator/reservoir cap when engine is cold
2-start the engine and let it idle
3-turn the heater on high
4-keep coolant on hand and add it as needed...some coolant may gush out with the air,so be careful
5-keep doing this until the engine is at operating tempeture,the heater is hot and the coolant in the radiator settles down
6-then install the cap
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