Question about 1999 Chevrolet Blazer

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Heater keeps blowing hot air for awhile then it blows cold. replaced thermostat and did not fix the problem. was suggested to change heat sensor. need to know where it is located.

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If youre driving down the road with decent heat and all of a sudden it gets cooler, and the engine temperature remains normal, i would strongly suggest flushing out the heater core at the firewall in engine compartment, very common problem due to the dex-cool antefreeze used be GM.

Posted on Nov 17, 2008

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3) If engine temperature is normal, then check the temperature of pipes that go to/from heater core. These pipes are located up the fire wall (easier access is from the passenger side). If pipe/pipes are cold (even engine is worm) it means you heater core is plugged and should be flushed. Keep in mind, flushing the whole cooling system is different from flushing heater core.
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