Question about 2001 Buick Century

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2003 century temp guage quikly goes to hot and back to norm

Rapid rise to hot and back to norm-- raise hood ---engine is not hot. This was happening every 3 or 4 months now daily. sometimes heater in car takes a long time to heat

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You need a new thermostat. These are cheap, but can be kinda difficult to change on some vehicles. Most of them can be done very easily though. Good luck hope this helps.



Posted on Nov 12, 2008


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Heater only blows cold air vent blend door working fine

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If so, the heater would not get hot, because the motor is not.
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There is likely a control near the firewall that is either controlled by a wire cable or a vacuum line.
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You may have an air pocket in your system which some times happens.  One way to get rid of it is to take the upper hose off on the engine side,  fill your system with water until it runs out from your engine block, replace the hose, start your car turn you heater on and set to hi keep the radiator cap loose until the temp start to rise then close tight.  Once the air pocket had been remover you can drain some of the water from the radiator using the lower drain plug and add antifreeze.   

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you have air trapped in the cooling system. A good indication is that one or both of your heater hoses going into the heater core are cold when they should be hot.
Park facing uphill, raise front of vehicle so radiator cap is higher than top of engine. (You want bubble to get to radiator and out the cap.)
Leave cap on but loose, so bubble can purge.
Turn heater on.
Fill radiator and reservoir with 50/50 mix of antifreeze.
Start engine and run at about 1500 roms until the engine warms up and thermostat opens.
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please Rate as fixya if this works. good luck

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