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Heating problem with my jeep

It blows cold air out of one side and hot air out of the other. The garage says that I need to recalibrate it - Is this true?

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  • Anonymous Dec 03, 2008

    when you turn the heat on,the passenger side blows hot,yhe driver side blows cold.even when both sides are turned all the way up in the heat mode.


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It sound like your blend door is not closing all the way and you may need to replace the door or the motor or may just need some wd40

Posted on Nov 27, 2008

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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.
I will give you a forewarning, that if you take your dash apart, it will be a bit time consuming, so make sure that you don't have to drive anywhere for a while (possibly the rest of the day depending on your experience). I will also warn you that you will want to be careful when working under your dash. Most things will be fine, but the small vacuum lines that I mentioned earlier, you will want to be sure you don't cut them or pinch them when putting your dash back together (not too easy to do, but possible since they just look like thick wires). Also I wouldn't recommend that you take apart the main air ducts on the passenger side. It is very tricky to remove and is kind of easy to break it or knock a hole in it (the smaller ducts that lead to your dash/ vents are a lot easier to work with and are stronger). I bought the interior of a jeep and I tore through the dash, and I ended up busting a hole in that duct.
I hope this helps and the best of luck to you.

Nov 25, 2012 | Jeep 10 x 20

1 Answer

My 1998 jeep grand cherokee only blows luke warm air even if I let the engine run for a while before hand. what's the problem?

If the blend door is allowing hot air to go from the heater core to the interior, then the heater core is likely to be clogged. Flush or replace the heater core that is clogged.

Jan 21, 2011 | Jeep 10 x 20

1 Answer

Left binocs out in rain. Now have moisture between

Try to blow hot air inside whit an air dryer
that all ican say from here...
good luck

Mar 29, 2010 | Optics

1 Answer

99 jeep cherokee not getting any heat. New waterpump and thermostat. System flushed and has flow. Heater hoses and upper radiator hose hot, lower hose warm. Any way to bleed air out of the system?

With engine cold, remove radiator cap, start engine, if there is air in the coolant system it will "burp" it out through the open radiator cap. Check fluid level and replace cap.
Good luck

Jan 31, 2010 | Jeep 10 x 20

1 Answer

I have an electrical shortage in my car when i go over bumps it heat or air will turn off or on. where would i look to see where the shortage is

Try looking at the electrical entry socket into the heater motor, they are usually on the passanger side footwell and can be dislodged by the passangers feet hitting the underside of the motor casing !

Dec 20, 2009 | Jeep 10 x 20

2 Answers

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

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:

You can find a very helpful detailed write-up of the fix/installation here:

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!

Dec 05, 2008 | Jeep 10 x 20

2 Answers


i have the same problem with a 1997 jeep cherokee country

Aug 29, 2008 | Jeep 10 x 20

1 Answer

97 Jeep Wrangler/heating system

Putting a/c is way rediculously too costly to even attempt, also, jeep a/c back in the day was mediocre at best, just deal with it. If you wanna cap that hose line off, go to town, but id really suggest not turning on the fan (that does not blow clod air to begin with) and just putting your windows down.

Jun 03, 2008 | Jeep 10 x 20

1 Answer

No Heat in 1990 Jeep Cherokee

well the first thing i would suggest is you take a look at its thermostat that could be over regulating hot air from flowing tothe heater if thats not got any major effect then have you been using an anti freeze formula for your engin coolant , because if not then it means the hot water pipes to your heater are blocked thank you.... if this was to benefit to you pease return the favour with a posetive rating

Nov 29, 2007 | Jeep 10 x 20

1 Answer

1982 Jeep Cherokee no heat

if you can hear the motor(fan) spinning, check the linkage that controls which vents are open, also check for a vacuum leak as the vacuum hoses on a jeep that old go out frequently and many times control the switching for the heater/defrost/ac. your first thing to do will be to grab a manual for this jeep and check the actual location of the heater/vent/ac fan. there is always the chance that the fan slipped off the motor (usually doesn't happen, but the circlips have been known to fail)

have you tried it in any other position? ie: vent or ac

Nov 21, 2007 | Jeep 10 x 20

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