Question about Pontiac Grand Am

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Problem..went to reinstall thermastat..was no thermastat in car. the housing was cracked, broken and is leaking antifreeze..why did the air work if no thermastat was in it???

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The thermostat has little to do with the air vent heat. The thermostat controls when the water is allowed to circulate in the motor so that is warms up properly. IT is common for people to remove the thermostat in southern states where it doesn't really freeze that often. In northern states in cold climates it helps protect the motor. The control valve that controls the heat is actually located on one of the 1 inch water supply lines that run to the firewall from the motor. There is a cable, vacuum line or electrical switch, depending on the year, that controls how much hot water is allowed to enter the heater core on the inside of the vehicle.

Posted on Jan 02, 2011

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A/c has nothing to do with antifreeze, it would work fine even if you had no antifreeze, but car would be running cooler then supposed to, and when you replace thermostat be careful and get it centered just right , if its not sitting in the indent when you tighten up the bolts it will crack the housing

Posted on Jan 02, 2011

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Thermostat holds water in motor until it heats up to thermostats temp. While thermostat is closed (holding water back) it allows water in radiator to cool. When thermostat opens cool water enters engine through lower hose, hot water into radiator. When cool water hits thermostat it closes again and repeats the cycle. Your A/C is not dependant on heated water as when air is on, heater valve in heater hose is closed. Get yourself a new housing, gasket & thermostat and fix it right. An added bonus is you'll probably get better gas mileage with correct thermostat.

Posted on Jan 02, 2011

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