Question about 2002 Jeep Grand Cherokee

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Turn on the defroster and it makes a really funny grinding sound. but only when i use the defroster or the air conditioning..is here a diverter that will do this or is it something else? sound stops when i turn the knob to off...

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MOST LIKELY THE ACTUATOR CONTROLLING THE AIR FLOW TO THE WINDSHIELD. IVE SEEN THIS NUMEROUS TIMES.

Posted on Oct 06, 2010

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1 Answer

What could be causing loud grinding noise when i switch on aircon? Aircon now not working but only makes loud sound.


Sounds like the bearing or part of the clutch in the A/C compressor has failed, or possibly component on a/c fouling on something due to recent repairs however would be unlikely and probably just a coincidence..

Check A/C compressor turns by hand, should be firm but not make any noises.

Check for fouling components related to a/c compressor clutch.

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It sounds like the actuator that diverts the air may have gone out. I would suggest replacing the blend-door actuator so that your air will go to the right places. The blend door actuator shouldn't cost more than $150.

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The air conditioning blows out of the defrost vents. It only works on high now but use to on low. It use to come out of the front vents ocassionally. We did replace the heater / air control unit in the...


Seems like the dampers are partically closed,look under steering column and see your duck work for the vent system.Follow it back to the blower box.Unhook if there, turn on ac, if you get full air, nice and cold on low and high you have blockage in your vent duct work,check the vent line that diverts air to the diffrent selected vents. Also check for vent disconnection around sterring column,and defrost vent area.

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The blower door actuator directs the air inside the car. This is air diverter is vacuum driven. A small leak in the vacuum will usually direct all the air to the defroster. Under the hood, go to the firewall and with the car running, inspect the vacuum lines. Trace the lines backwards and look/listen for a leak. Best of luck.
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1 Answer

Air diverter only diverts blown air to feet or defroster.


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Air condition


Have you checked the diverter doors under the dash??
It sounds like a vaccum hose may have fallen off your vent controller.
I have had similar problems and found that the air WAS moving, but it was all going up through the defrost vents at the windshield.
A quick check of the vac. lines showed that one under the glove box was pulled off.
with the engine running, try setting the air settings to all the options ( vent/floor/defrost..etc..)
See it you can feel or hear the diverters moving under the dash..

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replace compressor ;remove refrigerant ;accessory belt ;electrical connectors ;suction /discharge refrigerant hose from back of compressor ;bolts from compressor and engine block ;leave bracket attached to compressor

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