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Jeep Grand Cherokee A/C Heating Ventilation

372 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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#325 of 372 Grand Cherokee Heater Repair by heatertreater Apr 24, 2009 (10:54 pm)
Your mechanic at the car repair shop will most likely want to follow the dealer recommended repair for the blend doors. This requires removing the steering wheel, steering column, complete dash, evacuating the AC refrigerant system, draining the radiator and finally removing the plenum box so that it can be opened into two halves and the blend door replaced with more OEM plastic that will break again. Expect the price to range between $800 and $1200. While it's apart, it's probably a good idea to make sure that both the blend doors and re-circ door are replaced, and check the heater core and AC evaporator core for any signs of corrosion. After going this far, it's not a bad idea to just replace both of these components.   The alternative to the dealer recommended process is an aftermarket solution that cuts into the box with a dremel tool and replaces the door with metal at a fraction of the dealer cost. The solution has been successfully deployed on thousands of GC's and is a proven reliable repair. A video of the process is available on youtube and you can search Grand Cherokee blend door to find it. Certainly the aftermarket fix could be installed by a "mom and pop" garage, but most likely you will need to find and order the components and specifically push the shop to execute the fix you choose. There is always a little reluctance to do anything that is not a standard Chrysler repair process. Note that the process is relatively simple and you might well decide to do it yourself.   HeaterTreater Replies to this message: matthewbowes86 (Apr 27, 2009 2:02 pm) heatertreater (Apr 27, 2009 4:09 pm)
#326 of 372 Re: Grand Cherokee Heater Repair [heatertreater] by matthewbowes86 Apr 27, 2009 (2:02 pm)
Replying to: heatertreater (Apr 24, 2009 10:54 pm) Thanks for all this feedback. So what would you reccommend I tell the mechanic when I bring my car into get fixed, so I do not incur any costs I shouldnt be incurring. Replies to this message: heatertreater (Apr 27, 2009 4:09 pm)
#327 of 372 Re: Grand Cherokee Heater Repair [matthewbowes86] by heatertreater Apr 27, 2009 (4:09 pm)
Replying to: matthewbowes86 (Apr 27, 2009 2:02 pm) Your mechanic will most likely not have any solution for you other than replacing the blend door per the factory recommendation. As outlined above, this is an expensive proposition. There is an aftermarket alternative that you could either install yourself or take to the mechanic with instructions and a request that he do the installation. You will have to do the searching yourself since this forum does not condone direct links to aftermarket products.   HeaterTreater
#328 of 372 Blen Dor by blendor Apr 27, 2009 (4:35 pm)
Replying to: matthewbowes86 (Apr 24, 2009 5:24 pm) Glad you took my advice and read your fault codes. That has given you an excellent place to start   Your description in post #316 of the air flow only comes out of the vents when driving and nothing when stopped. That sounds like you could also have a blower problem.   Can you hear the blower working? Can you hear the blower working and no air is coming out of the vents. (When the vehicle is NOT moving) If this is happening – that is a symptom of the broken recirculation door - not a blower motor problem.   In your previous post #323 your fault codes were 52, 54, 56. The #52 is a recirculation door problem. The 54 is the driver’s side blend door problem and the #56 is the passenger’s side blend door problem.   As you probably already know, replacing the blend doors requires the HVAC box to be removed from the vehicle and taken apart. Most of the labor cost is in process of removing and replacing the HVAC box.   So about the only thing you could tell the mechanic is that you have read the fault codes and replacing anything more then the recirculation door and the blend doors will require you to visually check the part before giving approval.   Good Luck
#330 of 372 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 372 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 372 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 372 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 372 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)

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