heater

[Dutchessmom]

I hope that someone here can help me figure out my problem. I am trying to not have to take it to the dealership for diagnosis. Anyway, I have a 2002 grand cherokee, when I have the heat on, the air out of the passenger side still comes out cold. It doesn't matter what I set the passenger temp to. Any clues as to what might cause this?

[mikeb690]

Originally Posted by Dutchessmom

I hope that someone here can help me figure out my problem. I am trying to not have to take it to the dealership for diagnosis. Anyway, I have a 2002 grand cherokee, when I have the heat on, the air out of the passenger side still comes out cold. It doesn't matter what I set the passenger temp to. Any clues as to what might cause this?

I'm having the same problem also, I have a 2001 grand cherokee. Try this, turn your car on then press and hold the ac and recirc buttons at the same time, then while holding the 2 buttons down turn the left climate control one notch at this point everything on the heater screen should come up. After the screen flashes everying up let go of the buttons and code numbers should flash up. Then tell me what the numbers are and I'll check the book I have and tell you where the problem is. My code numbers were 52- recirc door travel two large and 56- right temp door travel to large. I'm still trying to figure how to fix it, I'm about to start working on it now.

[Dutchessmom]

Originally Posted by mikeb690

I'm having the same problem also, I have a 2001 grand cherokee. Try this, turn your car on then press and hold the ac and recirc buttons at the same time, then while holding the 2 buttons down turn the left climate control one notch at this point everything on the heater screen should come up. After the screen flashes everying up let go of the buttons and code numbers should flash up. Then tell me what the numbers are and I'll check the book I have and tell you where the problem is. My code numbers were 52- recirc door travel two large and 56- right temp door travel to large. I'm still trying to figure how to fix it, I'm about to start working on it now.

I did what you said and.... My codes are the same as yours. First flashed 52 then 56. Am I understanding you correct in that the doors that is to shift the air are too large? hmmmm wouldn't that be an issue that would make Jeep responsible for the repair? I remember that about a year ago I could hear a noise from time to time coming from the passenger under-dash that sounded like a clatter for the lack of a better word. I mentioned that to the service dept. once while in for a maint. and the guy told me that there used to be a problem with the air transfer on older models and that they fixed it my making this thing shift from time to time. Made no sense to me, does it to you? I called them about a month ago to see if there were any recalls but they said no.
Thanks for responding to my request. Any other info that you can give me would be GREAT!!

[mikeb690]

Yeah no recalls as far as I can remember but from I've read this is a common problem with the plastic doors break and the servos open to far and thats what it reads, so basically the door is broken. I had part of my dash apart and I have to take alot more out to get to it. I believe I will also have to have the ac discharged and remove the heating lines. The part is $125 and I think they give you the bottom half of the heater box but its a real pain to get to. From what Ive read its very time consuming and pepole on here that had it done from the dealer said they paid about a grand to get it done(extened warranty sounds good now). I'll be trying to tackle that this weekend because I'm not pay a grand to get my heater fixed. I'll let you know how I make out..Mike

[Dutchessmom]

Hey Mike,

Thanks for the info. Wow, a grand... Geeezzz I look forward to hearing how you make out with this. :-) I will then follow. If I am able to find anymore info. I will forward it to ya. Good luck.

[Dale Aeppli]

Originally Posted by Dutchessmom

Hey Mike,

Thanks for the info. Wow, a grand... Geeezzz I look forward to hearing how you make out with this. :-) I will then follow. If I am able to find anymore info. I will forward it to ya. Good luck.

HI I HAVE A SHEET ON THE CLIMATE CONTROL THAT YOU MAYBE ABLE TO USE. THIS IS IN MY FILES IF YOU WANT HOLLER MIKE 690 YOU'RE WELCOME TO THIS TOO CAN'T SEND THRU FORUM DALE
[email protected]

[condor1957]

Originally Posted by mikeb690

Yeah no recalls as far as I can remember but from I've read this is a common problem with the plastic doors break and the servos open to far and thats what it reads, so basically the door is broken. I had part of my dash apart and I have to take alot more out to get to it. I believe I will also have to have the ac discharged and remove the heating lines. The part is $125 and I think they give you the bottom half of the heater box but its a real pain to get to. From what Ive read its very time consuming and pepole on here that had it done from the dealer said they paid about a grand to get it done(extened warranty sounds good now). I'll be trying to tackle that this weekend because I'm not pay a grand to get my heater fixed. I'll let you know how I make out..Mike

I get cold air on the driver side and warm air on the passenger side (this just started yesterday). Followed your earlier instructions about codes and got codes: 49, 50, 52, 54 and 55. Any help about those codes and what they mean would be greatly appreciated. I took the negative cable off the battery this morning to reset the computer and that fixed the problem until I started the vehicle for the second, and subsequent times, today - back to cold air driver side and warm air passenger side. Thanks for any help.

Just as an fyi: I have a 99 Gr. Ch. Limited with the 4.7. I've already replaced the resistor for the heater (Chrysler part #5012699AA - this allowed the fan motor to work again). The door that regulates the flow of outside air and recirculated air also broke a couple years back and it's now held in place with those little stainless steel "runners" that are found along the sides of some windshield wipers - they did the trick.

Thanks again,
Dave

[KCarpy911]

im actually having the same issue. hot on drivers side and cold on passenger side. its an 02 limited with climate control. i have an appointment tomorrow to have it looked at. im not HAPPY from what ive heard on the board. it doesnt sound good.

i did the code trick a fiew weeks ago and there were all sorts of flashing codes. in fact, every time i reset the power (fuse trick) i get different codes.

also, fyi, i paid about 200 three weeks ago to fix the resistor? i had NO air. now i have air...its just screwed up

[jws41]

It if helps I had that problem last year as it was a pain to deal with, but in the end it took about 6 hours and saved a ton of money. The servo is overextending, and what happens is the modulator that rotates the blend doors keeps rotating because part of the plastic breaks. This make the system not know where the high and low part area is. So the system shuts that side down and blows cold air. When you take apart the dash board you will have 4 areas to take apart. 1 is the center console, 2 is the dash board skin, this means the radio, upper speakers, glove box and a lot more things to get all the nuts and bolts. 3 From there you will have a skeleton to take out. This skeleton has nuts that secure it on the floor between the steering wheel and on top. This skeleton directs airflow to the correct vents. And final step 4, will require you to take the heater hoses and a/c lines off from in side the engine compartment. You will want to discharge the a/c system other wise I'm sure it will make a nice mess. Then you un screw the nuts from the engine compartment and the few inside. Take the securing clips off the case and separte it. You will find the blend air doors then. Take the modulators off and swap the blend air doors and then put it back together. Do it in 1 day other wise you'll possible for get what goes where. Hope this helps and it will save you well over a grand.

[jeepheaterfix]

Hello,
I have developed a solution for the jeep grand cherokee heating problem. The usual problem involves the breaking of the blend doors. This occurs more often than any other heat/a.c. issue. My solution is strong, easy to install, and it definitely beats paying the dealer $1800!! For more info please email me: jeepheaterfix at yahoo