Quote:
Originally Posted by rick surgent
Had similiar problem in a 300sd. the climate control box was not shutting the recirc door in the system. So hot outside air was being allowed into the cooled air.
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But the AC blows cold when running at highway speeds even if outside ambient temps is above 80 deg. The cold only disappears when the car is parked or lined up in a slow crawling traffic jam (about 5 to 10 ft per minute)