Afternnon, just wondering about the best way to locate the blend doors in the hvac box without ripping out the dash on my 2000 jeep grand cherokee. Thanks in advance. Duane

Blazer Jimmy Blend door actuator replacement HVAC

Sounds like the blend door actuator. It separates the driver and passenger side from getting air on the AZC system. Here are some instructions on replacing it:
The passenger side blend door actuator is used on all models equipped with Automatic Zone Control (AZC). This actuator is located on the front of the HVAC housing to the right of the floor panel transmission tunnel and cannot be removed from the passenger compartment without instrument panel or HVAC housing removal.

NOTE: This procedure is for AZC Systems (Passenger side only).

1. Disconnect and isolate the battery negative cable.
2. Remove the glove box door. See: Body and Frame\Interior Moulding / Trim
3. Remove the lower I/P glove box door surround panel.
4. Remove the dash assembly. See: Body and Frame\Interior Moulding / Trim\Dashboard / Instrument Panel\Service and Repair\Instrument Panel Assembly
5. Remove the HVAC assembly. See: Housing Assembly HVAC\Service and Repair
6. Unplug the wire harness connector from the blend door actuator.
7. Remove the 2 screws that secure the blend door actuator to the HVAC housing.
8. Remove the blend door actuator from the HVAC housing.

INSTALLATION - AZC (Passenger side only)

1. In stall the blend door actuator on the HVAC housing and tighten the two mounting screws to 2.2 Nm (20 in. lbs.).
2. Plug in the wire harness connector to the blend door actuator.
3. In stall the HVAC unit into the vehicle. See: Housing Assembly HVAC\Service and Repair
4. Install the instrument panel assembly into the vehicle. See: Body and Frame\Interior Moulding / Trim\Dashboard / Instrument Panel\Service and Repair\Instrument Panel Assembly
5. Evacuate the HVAC system.
6. Recharge the HVAC system.
7. Connect and the battery negative cable.

Hope it helps! If you need more, just send me an email at familyguy77351 at yah I wil be glad to finish helping you with more detail.

If your Grand Cherokee is equipped with dual climate control, then it sounds like your blend doors in the heater box have broke and aren't switching. I would bring it to your local Jeep dealer and have them look at the HVAC for blend door faults. Usually fault code 54 for blend door travel too large will come up. It is a rather expensive repair to have the blend doors replaced because they are part of the heater box and the dash has to be removed.

Best of luck

I had this problem on a 99 grand cherokee limited, It was the heater blend doors and if you have dual climate control one side usually goes out before the other. These blend doors are located behind the glove box unaccessible inside the HVAC shell.
(http://www.wjjeeps.com/hvac_sub_assembly.htm) Motor failures for this HVAC sub assemblies is also something to look for although much less common.
My local dealership estimated $$$$$$$$$950.00 because they have to remove the entire dash so I looked around for something else.
http://cgi.ebay.com/ebaymotors/Blen-Dor-Jeep-Grand-Cherokee-Blend-Door-Heater-Repair_W0QQcmdZViewItemQQhashZitem3eef1e1cd6QQitemZ270299700438QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories

I used something similar to this and now have heat that is controlled solely by the knob nearest the driver. It wasn't very difficult just kind of a tight squeeze.
Hope this helps
GOOD LUCK

no u must remove the dash.

never done one ?? but from what you describe you have fitted an actuator arm back to front

Broken blend door assembly inside the hvac housing. The recirculation door frequently breaks too. The dash has to be removed and a/c system discharged to perform repair.

The Blend door in the HVAC box. Unfortunatly this is the main cause of this type of problem u have to remove the dash and replace the blend door and the acuator.

Unfortunately this is a pricey repair. It sounds like the passenger side blend door is broken. The doors in the HVAC box are a weak point in the system. It's not uncommon for them to break and cause the situation your experiencing, or sometimes the reverse. It requires removal of the dash board to replace the blend doors. I'd say it's probably at the least $1k as it's about a 7-8 hour job.

The blend door is getting stuck in the HVAC housing. Common problems for jeep. Replace the HVAC blend door. hope this helps.