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Jeep Grand Cherokee A/C Heating Ventilation

371 messages,  Last post on Oct 27, 2009 at 2:04 PM

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What is this discussion about? Jeep Grand Cherokee, Heating / Cooling, SUV

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#330 of 371 Blend door motor wiring by mikes_fixit May 11, 2009 (3:16 pm)
I have a 1995 Jeep GC limited with a ATC heat AC system. The blend door motor goes to the hot air extreem and will not return. The blend door motor has a 5-pin connector. My Haynes service manual does not show the wiring diagram for this system. I found an old 2-pin motor made up a polarity revearse switch with a momentary push button to apply power. With the 2-pin motor installed the switch in one position holding the push button for 8-seconds (the time it takes for the motor to travel from one extreem to the other) gets me hot air. Selecting the reverse polarity on the switch haolding the pushbutton for 8-seconds get me very cold air. So my heat and AC systems are working and I am left with a controller problem. I beleive the blend door 5-pin motor should be controlled by the temperature control dial. Could anyone tell me where I could get a wiring diagram for the ATC showing the 5-pin blend dooor motor? Mikes_fixit Replies to this message: heatertreater (May 11, 2009 3:55 pm)
#331 of 371 Re: Blend door motor wiring [mikes_fixit] by heatertreater May 11, 2009 (3:55 pm)
Replying to: mikes_fixit (May 11, 2009 3:16 pm) The actuator motor has internal circuitry to determine the extents of movement and feeds that information back to the control system. The problem with this particular motor is that if it is allowed to move unconstrained, it will spin itself to a "point of no return". If the blend door or plastic axle connection break, the motor will turn to a point where the internal electrical wipe tangs make no connection and the motor goes into permanent sleep mode and cannot correct itself. There is an aftermarket kit that replaces the plastic connector between the metal blend door axle and the metal motor connection. The kit also includes complete instructions on how to disassemble the actuator motor, re-index the gears, and bring it back to life. It's next to impossible to find a replacement motor unless you can find one in a junk yard.   HeaterTreater
#332 of 371 Jeep GC Blowing hot air by skinsfan1 May 19, 2009 (3:23 pm)
I have a 2000 Jeep GC limited. Within the last two days, the vents on the driver's side of the vehicle will only blow hot air (with a/c on, or venting fresh outside air). The passenger side works fine. I've scanned this post and wonder if this is a blend door issue? Haven't tried the error codes yet, but will later this week. Any thoughts? Replies to this message: blendor (May 19, 2009 3:42 pm) skinsfan1 (May 19, 2009 5:48 pm) heatertreater (May 19, 2009 6:16 pm) blendor (May 19, 2009 6:35 pm) rlipcz01 (Jul 17, 2009 7:01 pm)
#333 of 371 Re: Jeep GC Blowing hot air [skinsfan1] by blendor May 19, 2009 (3:42 pm)
Replying to: skinsfan1 (May 19, 2009 3:23 pm) It sounds like a blend door problem! But, you should always read the fault codes before starting any repairs to the HVAC system.   Blen Dor Replies to this message: skinsfan1 (May 19, 2009 5:48 pm) heatertreater (May 19, 2009 6:16 pm) blendor (May 19, 2009 6:35 pm)
#334 of 371 Re: Jeep GC Blowing hot air [blendor] by skinsfan1 May 19, 2009 (5:48 pm)
Replying to: blendor (May 19, 2009 3:42 pm) I checked the fault code system as you recommended. I received two: 15 and 53. Can you advised on what they mean? and how to fix. BTW the instructions were perfect!! Replies to this message: heatertreater (May 19, 2009 6:16 pm) blendor (May 19, 2009 6:35 pm)
#335 of 371 Re: Jeep GC Blowing hot air [skinsfan1] by heatertreater May 19, 2009 (6:16 pm)
Replying to: skinsfan1 (May 19, 2009 5:48 pm) 15 and 53 are both driver's side blend door codes and this aligns with your symptoms. The codes indicate that the travel of the door is too small when the more common code would indicate that the door is traveling too far(54).   It sounds like the door is broken, but jammed such that it is constraining the axle. Either way, the diagnosis is definitive for blend door failure. The only component in the system that differentiates the temperature between the passenger and driver's side is the blend door, so you can be confident of the diagnosis.   There is a professionally designed aftermarket fix for this problem that is easy to install and will make a permanent repair to the system. Search the internet for installation video's and a site with more definitive information.   HeaterTreater
#336 of 371 Re: Jeep GC Blowing hot air [skinsfan1] by blendor May 19, 2009 (6:35 pm)
Replying to: skinsfan1 (May 19, 2009 5:48 pm) Glad you took my advice. It is much easier to diagnose your problem by reading the fault codes first.   15 = Left temperature door not responding This is a current code that indicates the driver’s side blend door actuator motor problem.   53= Left temperature door travel too small. This is a historical code that indicates the driver’s side blend door problem.   The driver’s side blend door actuator motor is behind the glove box. Easy to replace.   You have two options for the blend door repair. (1) Discharge the air conditioner, remove the dashboard and HVAC box, replace the blend doors. Replace the HVAC box and dashboard, recharge the air conditioner. The job should be completed within one to two days. (2) Do an access hole repair. No dashboard removal, the job will be completed in approximately one hour.   Blen Dor
#337 of 371 AC never works by bajawill Jun 09, 2009 (8:58 am)
I have been having AC problems for the last few years with my 200 Grand Cherokee Limited, 6 cylinder 4.0. I cannot even remember how many mechanics I have had work on it.   First the heat works great, to the point you can melt plastic with the vents.   The AC, we hooked up to pressure tester it cycles from low/no pressure to in the red zone, and them drops in like 6 seconds, repeats over and over.   I had the ac fan replaced no difference, I thought it was the Blending vents, I took the control off and manualy turned it, still no AC all just heat.  Oh codes show as 52 54 56 Any idea's?? Replies to this message: blendor (Jun 18, 2009 11:10 am)
#339 of 371 AC noise in dashboard by redtop2 Jun 10, 2009 (3:44 am)
Had to have the evaporator repllaced in 2002 8 cyl grand cherokee. Since then, there is a whistling/hissing noise in the dash when ac is on, every 20 - 30 seconds. Dealer tech says it's normal. Also, the condensate drain was blocked and my dash filled with water - had to have it back for that. I've never heard this before thru 3 jeeps or on this one before service. I just don't want to come back in 2 months with another expensive repair that was caused by this repair not being completed or being done incorrectly from the condensate line being blocked. Any ideas?

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