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Air conditioning When in the MAX setting my air conditioner now blows from the defrost vent instead of the panel vents. After the cab temp starts to reach the desired setting it will go back and forth from the defrost vents and the panel vents. The manual says the air recirculates from the cab in the MAX setting and should blow fromthe panel vents. Where is the return in the cab so I can check to see if it blocked.
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the a/c control is electric for temp control and vacuum for mode control when a leak occurs it defaults to defrost floor .look for a leak or broken vacuum line first then control panel then mode actuator.
No airflow at all or just not cold? The AC only runs in the AC , Max or either of the defrost modes to automatically dehumidify the air to reduce fogging. The other positions vent in outside (non conditioned) air.
Most likely the louver doors that control were the air comes out are frozen in place. or there is a vacuum leak that will not allow enough vacuum to move the doors. I hope this helps please rate this thank you
Some thing you could look at would be this. The control is usually fed by a vacuum line or small hose thats is connected to your intake manifold.
With a cold engine,look for a skinny vacuum hose that runs from the intake toward the fire wall . It should be going inside the cab and connecting to the A/C vent control.Some times the hose becomes disconnected or splits or cracks due to heat under the hood.
Thats usually the trouble.
I hope this helps you.
It's normal for the A/C compressor to come on with the defroster to dehumidify the air so the windsheild won't fog up under humid conditions. You can still control the air temp. out the vents with the temp. select switch.
if your ac is on max i believe it recirculates the air in the car by sucking air in by the defrost vents and blows it back out of the normal vents try to move the controls to make sure the that the shutters are working and make sure the ac is not on max by selecting the knob that has an arrow going through the little car instead of the circular one that might fix the problem
The Climate control system in your truck has a gate that changes postition in order to change the flow of air from your face to defrost. The door is actuated by vacuum. Yours is still working otherwise it would be on defrost all the time. So you do have partial vacuum to the actuator but not enough to keep it in position when on high. Sounds like you have a vacuum leak but not bad enough (yet) to totally disable the gate.
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