Posted by andy r on December 07, 2010 at 18:11:03 from (69.66.71.73):
First, thanks for all of the suggestions. This is a 2002 1/2 ton pickup with a 4.3 engine. I do not have dual temperature control. Today will driving, I turned the heating selector knob to throw the air outward from the dash rather than onto the floor. I also turned the fan to low. When the temperature knob is turned to the cooler position, really cold air comes from the dash vents when you put your hand at the outlet. Then when I turn the temperature knob to hot the air from the vents actually gets warmer, again by feeling with your hand. Just not warm enough to heat up the cab. Wouldn't this indicate that the blending door is probably working since it gets really cold and then luke warm??? If so, does this leave the heater core as the main problem? I have never had heater core problems with any other vehicles in my life. What makes Dodge Rams have this problem?? Can it be back flushed to make it work??? Maybe with some cleaners and the force of a garden hose?? All of you guys are really helpful. Thanks. andy
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