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2003 Century - heat & defrost requires 30 minutes

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Old 12-28-2011, 09:52 AM
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Sounds like a heater core problem. You might have air trapped in there. If the gauge looks like it heats up normally, then you can rule out the thermostat. That was gonna be my first guess. If you watch the gauge closely, and it bounces around a lot when warm, I'd suspect air trapped in the system.
If bleeding the system of air first doesn't work, I would recommend flushing the system. There could be some crud backed up in the heater core, that is making it tough for the warm coolant to get in there.
Old 01-16-2012, 08:37 AM
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if you have the 6cyl it has bleeder screws, if your looking at the front of the car there is one front left on the crossover and another on the right. the most logical theory ive heard from the chocolate is the factory put sealant in all the 60deg engines when they were having the gasket issues. i had a 03 monte with that engine i bought was less than a year old and by the time i put 30k the whole tank and everything was all stained. i flushed it a bunch of times, put prestone extended life and flushed it every other year for 165k miles and it always came back. same with my moms impala.

if your heat doesnt work good i usually rig up something on the core hoses so i can flush it both ways with the garden hose, that usually gets the garbage out.
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