The other night my 4cyl equinox overheated. Today I put a new thermostat and coolant cap, and topped off the coolant. It overheated again, and it there was no more coolant in the overflow tank. After topping off and driving and repeating three times.. it seems to get cooler or take longer to get too hot. Is there air in the system? I still am not getting heat through the vents. Is there a bleeder valve somewhere? Does anyone have a picture of it? Also does this car have an actual rad cap? If there is air in the system, how do I get it out? I hope it's not the water pump chain. How would I know, wouldn't have an audible difference if it was broken? Thanms.
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