# Ac blowing warm air at a long idle

**URL:** <https://community.cartalk.com/t/ac-blowing-warm-air-at-a-long-idle/73729>\
**Category:** Maintenance/Repairs\
**Tags:** gmc\
**Created:** [July 24, 2012, 4:18pm UTC](https://community.cartalk.com/t/ac-blowing-warm-air-at-a-long-idle/73729 "2012-07-24T16:18:19Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![sparky1960](https://avatars.discourse-cdn.com/v4/letter/s/77aa72/32.png) [@sparky1960](https://community.cartalk.com/u/sparky1960)\
**Post date:** [July 24, 2012, 4:18pm UTC](https://community.cartalk.com/t/ac-blowing-warm-air-at-a-long-idle/73729/1 "2012-07-24T16:18:19Z")

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Have a 2003 gmc truck 1500hd. When i come to a stop or at idle , my ac blows warm air out. At cursing speed it blows cold air

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**Author:** ![VDCdriver](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/vdcdriver/32/30_2.png) [@VDCdriver](https://community.cartalk.com/u/VDCdriver)\
**Post date:** [July 24, 2012, 4:33pm UTC](https://community.cartalk.com/t/ac-blowing-warm-air-at-a-long-idle/73729/2 "2012-07-24T16:33:24Z")

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Have the refrigerant charge checked. More than likely, you just need a refrigerant recharge.

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**Author:** ![W30post](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/w30post/32/2522_2.png) [@W30post](https://community.cartalk.com/u/W30post)\
**Post date:** [July 24, 2012, 5:43pm UTC](https://community.cartalk.com/t/ac-blowing-warm-air-at-a-long-idle/73729/3 "2012-07-24T17:43:57Z")

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Depending on mileage and particular maintenance the cooling fins on the condenser in front of the radiator could use a cleaning or maybe the fan clutch (if it has one) could be weak and not drawing enough air at idle.

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**Author:** ![drjimphd](https://avatars.discourse-cdn.com/v4/letter/d/d2c977/32.png) [@drjimphd](https://community.cartalk.com/u/drjimphd)\
**Post date:** [July 24, 2012, 8:34pm UTC](https://community.cartalk.com/t/ac-blowing-warm-air-at-a-long-idle/73729/4 "2012-07-24T20:34:09Z")

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Even simpler: seized motor, no voltage to fan, or bad ground wire to condenser fan can preclude it from running at all. On the road, plenty of air through the condenser – cold air; at idle, none; result – just what she experienced.

Always start with the simplest – and cheapest (KISS) diagnosis.

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**Author:** ![W30post](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/w30post/32/2522_2.png) [@W30post](https://community.cartalk.com/u/W30post)\
**Post date:** [July 24, 2012, 11:54pm UTC](https://community.cartalk.com/t/ac-blowing-warm-air-at-a-long-idle/73729/5 "2012-07-24T23:54:45Z")

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No sure if the GM HD1500 trucks used an electric fan for the radiator or not here.

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**Author:** ![jsims](https://avatars.discourse-cdn.com/v4/letter/j/ccd318/32.png) [@jsims](https://community.cartalk.com/u/jsims)\
**Post date:** [July 25, 2012, 1:04am UTC](https://community.cartalk.com/t/ac-blowing-warm-air-at-a-long-idle/73729/6 "2012-07-25T01:04:21Z")

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the chevy and gmc trucks have a mech clutch fan but inside the fan shroud there is a elec. fan mounted aganst the rad it is very hard to see but its there i would check that and make sure the cond. behind the grill is not full of bugs and a plastic bag good idea to wash it out once a month with a good hose like at a car wash works great