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Air conditioning runs cool when driving but hot air comes out when waiting at a light or idling

(2007 Isuzu Ascender)
in Leavenworth, KS on July 12, 2018
For the past two swimmer seasons, the air conditioning will blow cold air (blows nicely) when in gear and in motion. When I’m at a light or idling while in line say at a bank or restaurant, it still blows air, but warm air.
How long have you had this problem? 2 summers but has gotten worse
Tags: air conditioning, isuzu, ascender
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Popular Answer
on July 12, 2018
Insufficient air flow into engine bay while stopped - radiator fan is likely suspect.

At highway speeds - don’t need a fan - ‘ram air’ does the cooling.

Recommend *hands-on* testing by qualified personnel.
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