Question about 1998 Chevrolet Blazer

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Heater does not blow warm air

Heater only blows cold air, changed thermostat and no change.

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  • 74 Answers

Try flushing the heater core there will be to rubber hoses that feed into the fire wall disconnect both of them and use a garden hose and flush from both side u could also use powder drain cleaner just run to extension hoses up act like a holding tank

Posted on Oct 26, 2012

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Posted on Jan 02, 2017

hankfan18436
  • 62 Answers

SOURCE: heater blows cold on 02 chevy silverado 1500 4.3 V6

your coolant could be low.

Posted on Nov 24, 2008

  • 99 Answers

SOURCE: Heater blowing cold both sides

Does it blow warm air when you drive the car? If so its the water pump.

Could also be air in the coolant system

Also have the cylinder head pressure tested to rule out a hblown head gasket
Hope this helps

Regards
Steve

Posted on Dec 11, 2008

  • 3 Answers

SOURCE: blowing cold air

I had the same problem that I just fix by flushing the heater core out with a hose.   take the two hoses off the fire wall and put the water to it and let flush.  my heater is putting out 150 dg. F  of hot air.   I'm so excited!  i will stay warm now.

Posted on Feb 27, 2009

juncro
  • 467 Answers

SOURCE: Air conditioner blows alternate cold and warm air

check the freon level

Posted on Jul 16, 2009

  • 30 Answers

SOURCE: Heater blows only luke warm air.

check control swicth

Posted on Feb 12, 2010

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Could also be air in the coolant system

Also have the cylinder head pressure tested to rule out a hblown head gasket
Hope this helps

Regards
Steve

Dec 11, 2008 | 2005 Chevrolet Impala

1 Answer

Heater blows cold air


With the car warmed up,feel the heater hoses,are they both warm/hot near the firewall in the engine compartment?If they are both warm/hot,then the heater core should have circulation through it and it may be a "blend door" issue in the heater a/c assembly.If they are not warm/hot then the heater core could be dirty and plugged up and needs to be flushed.
If the above does not help,a drain and vacuum of the cooling system and vacuum refill will remove any trapped air.
Sometimes,clamping off the top rad hose and holding the engine rpm at 2000 rpm will force trapped air out of the heater core.(Watch temp gauge when trying this)
Lastly,a NEW thermostat doesn't mean its working correctly.

May 18, 2017 | 2005 Lexus SC300

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