2005 Freightliner chassis heat/ac problem.
The fan works but won't heat or cool. Any idea what the problem might be?
Forum Discussion
wolfe10 wrote:
More info please:
Does the air from the fan come out the vents that you select?
With engine warmed up, you get no heat, but air flow, or no air flow? If air flow, but no heat, have someone turn the heat selector while you look under the hood at the heater valve to see if it is opening.
And, the A/C is not related to heater other than air flow. Do you have air flow from the vents selected? If so, does the A/C compressor come on? If on, no cold air?
And, if the air from the fan only comes out the defrost vents, check the vacuum pump and lines that control the dash HVAC. But, if this is the problem, you should be able to get hot air and cold air with the A/C on.
Air flow works fine in all selected positions, it just doesn't get warm when I need warm or cold when I need cold.
