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My 2002 chevy blazer is blowing hot air while driving but blowing cold air at idle

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

ndguy2481
  • 251 Answers

SOURCE: 2006 chvy impala when idling dont blow hot air

1 Inspect Cooling System Mix Coolant level low or flow is restricted. grey_line.gif 2 Inspect Thermostat Thermostat stuck closed grey_line.gif 3 Inspect Heater Control Valve Leaking or defective heater control valve. here something to help u

Here to help Shaun

Posted on Nov 23, 2008

  • 1 Answer

SOURCE: Heater blows cold air when idle

Sounds like you may have a partially plugged heater core. You could flush this out separately, from flushing radiator & engine block. Diconnect heater hoses going to your heater core and clamp off, so not to loose coolant from engine. Now hook up separate hose to one side of heater core pipe and flush out with typical garden hose. Repeat procedure on both heater core inlets. Reconnect original heater hoses and test difference. You may have to add an additional litre of antifreeze. If this don't work i suggest changing heater core. Good luck.........Ron.

Posted on Jan 03, 2009

  • 5 Answers

SOURCE: 1996 chevy s10 heater not blowing hot air

heater core or leak on cooling system

Posted on Jan 06, 2009

  • 1 Answer

SOURCE: Intermittant hot/cold air from heater

Had the same problem with my Mazda6 awhile back. Took it to the dealer and they found the radiator wasn't holding pressure. They replaced the whole radiator under warranty (WHEW!). Not sure how to check for that kind of thing, but it's a start.

Posted on Feb 02, 2009

  • 34 Answers

SOURCE: 2002 Tahoe Rear A/C doesn't work

check fuses & power to blower fan motor,plug connections.then apply 12 volts to blower fan motor if it dont turn its bad

Posted on May 16, 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?

Jan 27, 2015 | 2002 Pontiac Grand Am

1 Answer

Heater blows hot at idle and cold when driving


The water pump impeller has come adrift from the drive shaft ,one is plastic and and the other metal and they come apart causing this sort of problem

Jan 09, 2014 | Cars & Trucks

1 Answer

I drive a 2007 chevy impala, when im driving the heater blows out hot air but if im in idle it blows out cold air?


go to www. aa1car.com and get the topic and fix it. However you can see the diagram attached.
God bless you
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Nov 30, 2013 | Cars & Trucks

1 Answer

I have a 2002 Chevy tracker. It's been running hot on the temp gage. So, I have changed the thermostat and replaced the radiator hose because of corrosion but it still overheats and when I turn on


If there is cold air coming out the heater than there is air in the system. After you replaced the thermostat did you run the engine at idle with the radiator cap off until the engine came up to operating temp? Doing this will purge the air from the system.

Apr 14, 2013 | 2002 Chevrolet Tracker

1 Answer

Air condition does not blow cold air unless driving. Hot air blows from vents when in idle


check if the a/c fan is blowing if it is then change ur a/c condensor

Jul 17, 2010 | 2002 GMC Yukon XL

2 Answers

My 99 Blazer won't blow hot air. The Heater core


The problem was a vacuum line leak. Replaced the line.

Dec 30, 2009 | 1999 Chevrolet Blazer

2 Answers

On my 1995 chevy blazer s-10 my face vents are not blowing air


Your heater valve is stuck open, also in a pinch you can crimp off your hose to the heater coil at fire wall. Try to find the heater valve vacumb hose under the hood see if it is bad and fixit. or some models have a cable to the valve could be broken. 

Jun 02, 2009 | 1995 Chevrolet Blazer

1 Answer

Ventalation system not working on my chevy blazer 1996


Is it your ventilation not switching, or your blower motor not blowing air?

May 23, 2009 | 1996 Chevrolet Blazer

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