2000 Mack rd a.c. help

May 16, 2017 #1

Mack e7 motor if I let the truck sit it gets down to 40 degrees but when I drive it blows hot air where should I start looking ..

earthmover, May 16, 2017

#1

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May 16, 2017 #2

Duct work, doors, allowing fresh air from outside to over ride air through evaporator?

BoxCarKidd, May 16, 2017

#2