2000 jeep limited grand cherokee the driver gets heat hot, but the passenger side gets cool air. why?

You will have to check the flap operating controls behind the centre consol as anything could be wrong from a vacumn pipe to a operating mechanism ,even the computer controlling the climatic control .

Do you have dual zone control on the heat a/c control? It's been my experience that is the first thing to go. The blend door is more of a problem between blends, Like bi-level (defrost and floor etc..)

its not a fuse its a bad selector motor or broken blend door,

most likely there is a door in the dash somewhere that controls the flow of the air. the actuator that controls the door for that side might be bad

hi
check-out heatertreater.com, i had the same problem with my cherokee and bought the heater treater blend door repair kit. it really does work and you can fit it yourself in around half an hour. kit comes with all you need and full instructions..
hope this helps

Thats your blend air door. . .I had the same thing with my 02 Grand Cherokee and I think ALOT of other people have as well. I took it to the dealer and ended up costing right around $800, because they have to pull the dash apart to get to the blend air door.

You have the blend doors problem which needs to be fixed. At jeep it is about £1300, by EDM in bicester it is £255 and maintains dual control. I would imagine the recirc dooe is or soon will go as well.

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.

try flushing out the heater radiator core.remove the two pipes and put a hose on the conections and keep reverseing flow.dont forget to top up with pure antifreeze,

Pass. side blend air door motor is probably bad.