Question about 1997 Buick LeSabre

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Heater wont heat for long and if idling, heat turns cool again.

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  • 26 Answers

1. Low coolant level --- check! don't wait on this one!
2. Clogged heater core

Posted on Mar 10, 2009

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2 Answers

Why does the heater blow hot air when I drive after its been idling for 15min and not during the idle when it reaches the 100 Temp?...(it blows cold air in idle)


Firstly, a thermostat that opens quicker will not give you better heat. Your heater core may be partially plugged causing a low flow issue. Another area to check would be the water pump impeller for corrosion or slipping on the shaft. Does the vehicle's cooling system operate well otherwise?

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Some cars have a vacume check valve on the vacume line that
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Welcome to Fixya

Sounds like you have a problem with the cooling system. First thing you need to check first if the auxillary fans are working from the time you are the engine is overheating. If the auxillary fans is not working then the problem would be the aux fan itself or relays. if Fan is working then you might have a poblem with the water pump.

Thank you for using Fixya!

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