Question about 2000 Jeep Grand Cherokee
Rule 1 . all cars. all electrics check the fuse in both boxes.
if it works on one vent , with full blow force, and full heat
its not the engine, the blower, or the heater temp path.
its the dampers
there are 3 technologies of dampers, cable, vacuum and motors.
some are hyrbid. mixed.
The FSM covers this. grand or not grand cherokee, big diffr that.
ill guess. your posted to grand but its a non grand so will answer for
plain jane cherokee.
i log in to alldata.com so can you!
oops yours is the VACUUM monster, and with blend door feedback
electronics. did you scan the PCM to see if it has DTCs for HVAC fails?
my online source has poor Hvac, docs. zero vacuum side. so....
So with all vacuum systems. the control failed to send the vacuum out to damper solenoid
the hose fell off, or is cracked.
the servo is dead, or has cracked diaphram
the damper rod fell off
the damper is jammed.
what i do with all vacuum servos; is move it by hand, got heat now>?
bingo, job half solve in 5 min work.
yes i reach up there or remove glove box, what ever it TAKES.
to touch the slave servo.
happy new year !
Posted on Dec 31, 2013
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Posted on Jan 02, 2017
THis is a know problem with Jeep GC. If only one side is cold and the other is hot and there are no controls error codes. It is likely a broken temperature blend door on the faulty side (w/ dual controls). Dealer charges a lot to fix ~$800. There is a kit and instructions sold on EBAY to replace the part for $100. Seller claims that a relative novice can fix w/o removing the entire dash board as the dealer does. Has sold hundreds of kits....people seem satisfied....you may check it out. Search Heater Blend Door Jeep on ebay. Replacement parts are aluminum instead of OEM plastic.
Self Diagnostics on HVAC system. Jeep GC has built in diagnostics and will return error codes on the temp display if it is otherwise. Simple to display.
1) Press A/C and Recir button simutaneously
2) Rotate driver temp control knob clockwise then release buttons
3) If no controls error a code of "0" or "00" will be returned.
4) Error codes listings can be found on-line if anything but zero
Dealers charge $45 to run the same check
Posted on Jan 21, 2009
look for Main A/C relay, look for fuses, or go to a/c shop and have gas check out, perhaps leaks, perhaps evaporator, perhaps condenser, but start for relay box on front passengers side, or fuses on same side
Posted on Feb 01, 2009
There is a vacuum leak under the hood. If it's a 6 cylinder, look on the drivers side for a vacuum line that runs vertical with a 90 degree angle fitting to the manifold. That one usually comes off. If it is a V8 look on the battery side for a broken or corroded vacuum line.
Posted on May 18, 2009
My 1999 limited does this. When i bought it off the guy he said that its because of some flap down by the passengers left foot. In mine the passenger air barely even blows because of this.
Posted on Jun 20, 2009
this sounds like the recirculation door in the heater box is broken and this is a difficult and can be an expensive repair as the dash has to be removed for access. a quick check for this is if you release the glove box and let it hang you will see the heater box if you reach up to the left top you will feel a grid and the recirc flap is housed there you can operate the blower and hot and cold and see if flap moves
Posted on Jun 22, 2009
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