Question about 1999 Chevrolet Tahoe

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Heater only blows semi warm air - 1999 Chevrolet Tahoe

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Check the heater coolant flow valve is fully turned on when heater selected.
Check the temperature regulation & heat/demist air flow vanes are operating correctly,
Check motor operating temperature is as per specification- if motor running too cold replace the coolant thermostat.

Posted on Oct 08, 2009

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Posted on Jan 02, 2017

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I have a 2007 Saturn, Aura. Heater does not blow hot, slow coolant leak, & it also over heats. Please help! I'm freezing when I'm in my car!!!


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My yruck only blows cold air wont blow warm


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I am sometimes called upon to flush out a heater radiator. Sometimes it works and sometimes it doesn't and sometimes it causes a leak and the heater radiator must be replaced. Not an easy job on many vehicles made in the last couple of decades..

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My heater is blowing cold air when the vehicle is stopped, still blows warm air when car is in motion.


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Air works great but no heat just blows cold air


For this types of problem,i suggest you to check this help links:----Car heater blowing warm, but not hot air?http://schematicsdiagram.blogspot.com/2011/12/car-heater-blowing-warm-but-not-hot-air.html
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--------Heater problem?http://technoanswers.blogspot.in/2012/02/heater-problem-on-isuzu-trooper.html
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-----------Heat blows cold on drivers side and hot on passenger side?http://schematicsdiagram.blogspot.com/2011/12/heat-blows-cold-on-drivers-side-and-hot.html----------------This will help.Thanks.

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My heatet is blowing semi-warm air. Could this be


Verify the the engine is running cold first with an infrared gun or a scanner. . A shop can do this for you in a couple minutes. Or if you have a temp gauge you should be able to tell by looking at it. Thermostats are easy to swap out.

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Heater wont blow warm/hot air


check your radiator coolant, thats what I did and it blows warm again

Jan 15, 2009 | 1999 Pontiac Grand Prix

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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.

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