My car runs hot/temperature fluctuates, what are possible problems?
Check your temperature sender and gauge. Make sure all the air is bled from the cooling system. There are a few tricks in getting most of the air out when refilling. The sixteen-valve heads are prone to trap more air than the simpler eight-valve engines. A trick for getting most of the air out when refilling involves leaving the bleeder valve open while refilling, loading the system until the expansion tank is mostly full and then forcing the coolant through until coolant comes out the bleeder valve (how do you force the coolant through? You can perform “mouth to mouth” on the expansion tank, or you can use a coolant system pressure tester – a device which basically looks like a bicycle pump connected to a radiator cap). You may have to repeat the fill/pressurize cycle several times before coolant comes out of your bleeder valve. For all bleeding, make sure you crank the heater temperature control to the full open position or you’ll be there forever trying to get the air out. Check hos
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