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Heat comes out driverside/cool air comes out the passenger side?

I turn on my heat in my 2001 jeep grand cherokee limted 4.7 and heat only comes out on the driver side and cool air on the passenger side, i just put on a new blower resistor because it did'nt work at all, not i have this hot and cool problem to deal with. Is there some way i can fix this problem myself????? PLEASE HELP! Thank you....P.S. Could it be that the vents are not closing, and if so how can i fix this myself?

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It sounds like your blend doors are broken. As it turns out, this is a VERY common problem with grand cherokees. My father and I fixed this problem on my 2001 Jeep Grand Cherokee Limited 4.7 about 2 months ago using a product called Heater Treater, found here: http://www.heatertreater.net/

You can find a very helpful detailed write-up of the fix/installation here: http://www.jeepsunlimited.com/forums/showthread.php?t=854246

Trust me, this REALLY works and a lot of Jeep Grand Cherokee owners, including myself, have done this. YOU WON'T HAVE TO REMOVE YOUR DASHBOARD, as the repair is done by simply removing your glove box. The downside is that you will lose Dual Climate Control, as the driver side thermostat will now control both sides. For me, it was worth it. Only spending about $150 for a Do-It-Yourself solution, versus spending about $1000 to have a mechanic remove my dashboard to fix it.

Good luck!

Posted on Jan 17, 2009

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I agree with the above post i fixed it myself in about an hour its a great product

Posted on Dec 03, 2009

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2001 grand cherokee does not change from defrost to dash or floor although heat is hot any suggestions


First off I would like to appologize for this rediculously long post. I just know that, for me atleast, it is a little irritating when people give like one line solutions. I prefer ones that explain what things are, making it so I don't have to do more research to find out what/where something is or where it is located.
I had a similar problem on my 96 jeep grand Cherokee. Whenever I switched the setting to blow from the floor, it would come out of the dash. It would however switch from defrost to the vents. After I removed my dash to find the problem, I noticed that there was a vacuum hose (looks like a really thick wire with clear plastic L-shaped joints on the end) that is supposed to lead to the mechanism that changes the air flow from floor to vent or vent to defrost (looks like a small metallic cylinder that is a little smaller than a can of soda)(im not sure about an '01, but on my '96, that canister is located just above the accelerator pedal, and you can find this without removing your dash). That hose however wasn't connected to anything. Once I plugged it back in, my heater would switch from floor to vent to defrost like it was new.
So with your problem, you could possibly have your two hoses, that lead from the back of your switch that changes the flow of the air, disconnected or missing altogether. Another possible cause could be that your vaccuum storage container (located under the hood on the passenger side) isn't connected to that same switch. It could also have a leak in the hose or the storage container itself (unlikely that it leaks from the conainer due to its strength, unless it is under your battery and the battery leaked acid on it). This means that your jeep's vacuum system wouldn't have enough force to switch from the default setting, which is defrost, to your vents or floor. But it is actually quite common for your vacuum hose, that connects directly to the container to, over time, either break or disconnect from the storage container. A good way to check if you have a major leak in your main vacuum line is to see use your cruise control. If your cruise control completely doesn't work, then your line probably has a major leak or it isn't connected somewhere.
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