Question about 2005 Chevrolet Colorado

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A/C Blows warm when idle

My A/C stops blowing cold when idle but starts blowing cold again when moving. Code shows heat sending unit???

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  • Chevrolet Master
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I can't say much without having the actual code.
When the ac stops blowing cold at idle, the most common reason is not enough air flowing thru the radiator, or the radiator fan is not running and the only air flow is when the vehicle is moving.

Posted on May 10, 2013

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Posted on Jan 02, 2017

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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

  • 27 Answers

SOURCE: 2003 Chevy Venture Temperature Control

First check and make sure you have enough coolant. If so your thermostat needs to be replaced it is stuck open. you can find online repair manuals at autozone.com for free.

Posted on Mar 05, 2009

co7196
  • 3433 Answers

SOURCE: AC blow cold air when moving but warm air when stopped

AC system appears low on charge

Posted on Jun 19, 2009

juncro
  • 467 Answers

SOURCE: Air conditioner blows alternate cold and warm air

check the freon level

Posted on Jul 16, 2009

  • 881 Answers

SOURCE: The heater blows cold when

You could be but i dont think so
First thing check the thermostat ,, take out put in hot water (not boiling) and if it opens its ok but if its already open a bit ,fit new one. , also check the Water pump {when hot you should see water moving around with cap off and if not then water pump impella could be worn ,slipping etc Loose fan belt,,
or low in coolant..

Posted on Oct 10, 2009

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In cold weather heater will not blow warm air unless at idle stopped. when at highway speed blows cold air


check and make sure the radiator is full of antifreeze take off the radiator cap and top off the radiator then take your hand and cover the hole where the cap goes and squeeze the top radiator hose a few times to help it go down that way if there is a air pocket somewhere it will help push it out when you thank your done top off again and replace the cap and try

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Heat blows warm not hot


I would check for a coolant flow issue. heatcore could be clogged or a weak water pump.

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Car blows warm air when idling


It sounds like your AC unit could be overheating or even damaged.

AC units have a sensor that will turn them off automatically to prevent damage from overheating. If there is an insufficient amount of air flow, the unit will heat up, and then eventually turn off.

When the car is moving, more air is forced over the unit, likely keeping it cool enough to run, however, when the car come to a stop, it loses that air flow, and quickly heats up. Thus, the AC would work while the vehicle is in motion, and overheat and stop when the car is stopped and idling.

However, the AC unit could be completely blown. The cold air while moving could be just a case of air being forced into the car. Think of a house fan, the fast the wind blows on you, the cooler it gets.... Thus, it could be an illusion that the AC is working when car is in motion, when it really isn't.

Hope this helps.

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2006 nissan xterra wont heat up


water pump fins are worn, therefor you need higher rpm to move coolant faster. just change water pump

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1 Answer

Heater bows cold when idling


Hya!
You need to bleed the cooling system.
To do this park on level ground, when cold remove coolant filler cap, start engine and leave to idle.
Have plenty of warm/hot water available, when engine reaches operating temp it may appear to boil over so keep away from coolant filler, top up with warm/hot water and wait as it may bubble over a few times before settling.
Replace cap and hopefully back to normal, Remember your Anti Freeze?
Good luck,
Paul 'W'
Oner~EDson(:0) {#><U.K.

Jan 16, 2009 | 1995 Nissan Altima

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