2004 Chevrolet 2500HD blows hot air out of passenger vents & cold air out driver vents even though both of the temp. slides are at max cold
Check the fuse check the relay check the compressor and freon level
Most likely it is the climate control actuator valve. My 2004 1500 does the same and the valve is
about $140 - $160. When this happens, turn the ignition off and back on. The air will blow cold again.
The actuator for my Silverado 1500 (2004) was only $29 with shipping. A 30 minute fix, 6 screws .
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