Question about 1999 Jeep Grand Cherokee

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Heat is out on 1999 jeep grand cherokee limited

The air flow diagnostics gives me a reading the actuator doors are open too far. ive located new parts, but where are these doors

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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

Posted on Jan 13, 2010

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Posted on Jan 02, 2017

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I need to know if there is an external heater control valve on the eatc unit in my 2003 grand marquis /


This vehicle does NOT use a heater control valve. Coolant flows to the heater core at all times. Temperature is regulated by the blend air door and blend door actuator. Locate the blend door. Remove the actuator and open the door by hand. If you get heat, the actuator or the control head is bad. FWIW, the actuator is the most likely cause

Jan 06, 2018 | 2003 Mercury Grand Marquis

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Ford Explorer clicking- no heat


Blend door actuator failure is a common occurrence on many older Explorers. The clicking noise is actually caused by a stripped nylon gear constantly attempting to hold open the blend door which mixes the hot and cold air sent to registers on dash. As long as the temperature control setting is in the heat range this actuator will hold the door which wants to be normally closed, open. Air flow when the fan is on helps to hold the door open relieving stress on the gear. However whenever the fan or engine are off and the temp control is in the heat range the small gear must hold the door on its own which eventually leads to failure. My tip is to always return the temperature control to the cooling position whenever heat is not needed or truck is turned off. If you are reading this too late the link below will provide you with step by step instructions to replace actuator. I would recommend an OEM replacement part, it makes it easier to orientate when installing the new one. Did this myself and all went well.



http://redhouseon7th.com/redhouse/howto/2003FordExplorerBlendDoor/

on Mar 27, 2015 | Cars & Trucks

1 Answer

2007 Trailblazer 4.2L no air front vents a little air from consel vent any ideals? This is a climate control system.


I assuming the blower motor is working ? Because you don't say one way or the other . When switching from floor to vent to defrost do you hear any noise from in back of the I/P ? Mode door actuator . When moving from heat to A/C does anything change ? Or stay the same ,little air flow ?

I know must people do not want to hear this but you should take it to the dealer an have it checked for DTC'S - diagnostic trouble codes ! The auto parts stores con not read these codes .
More then likely one of the system actuators ( electric motor ) is bad an code is present .
DTC B0229, B0414, B0424, B3761, or B3770
The following DTCs are for the HVAC door actuators:
• B0229 is for the recirculation actuator.
• B0414 is for the left air temperature actuator.
• B0424 is for the right air temperature actuator.
• B3761 is for the defrost actuator.
• B3770 is for the mode actuator.

DTC B0248, B0263, B0268, B0408, or B0418

The following DTCs are for the HVAC door actuators:
• B0248 is for the defrost actuator.
• B0263 is for the mode actuator.
• B0268 is for the recirculation actuator.
• B0408 is for the left air temperature actuator.
• B0418 is for the right air temperature actuator.

Mar 13, 2017 | Cars & Trucks

1 Answer

Having problems with climate control. Temp setting does not come back on to the last setting it always comes back on at 75. Also when pushing the front defrost it doesn't blow air.


You may want to have it check for DTC'S diagnostic trouble codes . A code may point to the problem , these HVAC systems are very complex .
DTC B0248, B0268, B0408, B0418, B0428, or B3531
The HVAC door actuator is an electronic motor with a feedback potentiometer. The HVAC control module supplies power and ground to the actuator. The HVAC control module controls the direction of the actuator by changing the polarity of the control circuit. When the actuator reaches the desired position, voltage is removed from the control circuit. The HVAC control module determines the current position of the actuator by monitoring the feedback voltage of the door position signal circuit. The feedback potentiometer position is a function of the actuator position.
• Air flow control 3 circuit refers to the front mode actuator
• Air flow control 7 circuit refers to the recirc actuator.
• Temperature control 1 circuit refers to the driver air temperature actuator
• Temperature control 2 circuit refers to the passenger air temperature actuator
• Temperature control 3 circuit refers to the rear air temperature actuator
• Air flow control 10 circuit refers to the rear mode actuator
DTC Descriptors
This diagnostic procedure supports the following DTCs:
• DTC B0248 Air Flow Control 3 Circuit
• DTC B0268 Air Flow Control 7 Circuit
• DTC B0408 Temperature Control 1 Circuit
• DTC B0418 Temperature Control 2 Circuit
• DTC B0428 Temperature Control 3 Circuit
• DTC B3531 Air Flow Control 10 Circuit

Your having air flow issues and temp. control !
DTC B0413, B0423, B0433, B3761, B3773, or B3782
This diagnostic procedure supports the following DTCs:
• DTC B0413 Temperature Control 1 Feedback Circuit
• DTC B0423 Temperature Control 2 Feedback Circuit
• DTC B0433 Temperature Control 3 Feedback Circuit
• DTC B3761 Air Flow Control 3 Feedback Circuit
• DTC B3773 Air Flow Control 7 Feedback Circuit
• DTC B3782 Air Flow Control 10 Feedback Circuit

Do you know what a scan tool is ?
Install a scan tool.
Turn ON the ignition, with the engine OFF.
With a scan tool, command the appropriate actuator in both directions.
Does the actual parameter of the appropriate actuator change?

Jan 10, 2017 | 2005 Cadillac STS

1 Answer

I have a 2001 chrysler voyager where is the blend door actuator located and how to remove it


its in the HVAC heater core box,
how to remove it is a very long answer.
read the FSM on HVAC
or login to alldata.com see HVAC chapter, and read. it.
anyone can, not just me.

i see this on line,.
  1. Disconnect and isolate the battery negative cable.
  2. Remove first row seat.
  3. Remove second row seat.
  4. Remove sliding door sill trim panel.
  5. Remove quarter trim bolster.
  6. Remove D-pillar trim panel.
  7. Remove first row seat belt anchor.
  8. Remove second row seat belt anchor.
  9. Remove screws attaching quarter trim to quarter panel from bolster area.
  10. Remove screws attaching rear edge of quarter trim to attaching bracket.
  11. Disengage hidden clips attaching front of quarter trim to quarter panel rearward of sliding door opening and at locators.
  12. Remove quarter trim from quarter panel.
  13. Disconnect speaker wire connector on LWB quarter trim panel with rear air conditioning.
  14. Pass second row seat belt through slot in trim panel on long wheel base vehicle.
  15. Pass first row seat belt through slot in trim panel.
  16. Remove quarter trim panel from vehicle.
  17. Remove the two screws that secure the top of the quarter trim panel attaching bracket to the quarter inner panel.
  18. Remove the screw that secures the back of the rear heater-A/C unit housing to the right D-pillar.
  19. Remove the screw that secures the front of the rear heater-A/C unit housing to the right quarter inner panel.
  20. Carefully pull the top of the rear heater-A/C unit housing away from the right quarter inner panel far enough to reach between the rear heater-A/C unit housing and the quarter inner panel to access the blend door actuator.
  21. Remove the two screws that secure the blend door actuator to the rear heater-A/C unit housing.
  22. Pull the blend door actuator away from the rear heater-A/C unit housing far enough to disengage the actuator output shaft from the blend air door pivot.
  23. Raise the blend door actuator far enough to access and disconnect the rear HVAC wire harness connector for the actuator from the actuator connector receptacle.
  24. Remove the blend door actuator from between the rear heater-A/C unit housing and the quarter inner panel.

May 21, 2014 | 2001 Chrysler Voyager

2 Answers

NO HEAT STUCK ON AC HEAR CLICKING IN CENTER CONSOLE


Air Temperature Control Blend Door Failure No Heat or no AC (dependes on where door sticks)

In all modern cars there is a tiny DC electric motor driven gear drive that moves a plastic door that blends heated and cooled air from the AC and the heater core, this is called (interestedly enough) the air temperature control blend door actuator. The motor that moves this door fails because the door starts sticking from warping, most common complaint is no heat but it can be no AC as well. To replace these parts (blend door and blend door actuator) you must remove the entire dash from the car. Always have this problem confirmed by a dealer or qualified repair shop as it is a very expensive repair.

Other causes of no heat in the cabin are engine thermostats that are stuck open (engine runs cold) or air bubbles in the cooling system.

Nov 05, 2012 | Cars & Trucks

2 Answers

2003 ford explorer no heat and clicking in dash board


Clicking sound is your blend door actuator stripping it's gears and failing to open the door that directs the blower air through the heater core. Follow the sound to the actuator and remove it. Install a new one. You may have to remove some panels to get to it. The part is shown below and costs $32 at autozone. Please let me know if you have questions.

jturcotte_42.jpg

Dec 04, 2010 | 2003 Ford Explorer

1 Answer

We have a/c in the front but we have no cold air in the back...the fan blows but not cool air..ive changed to rear a/c filter so i know thats not the problem


You will need to replace the Blend Door Actuator. This part controls the flow of air to the vents and when it fails, you will not get air flow to the back. Also make sure your freon is fully charged up

Jul 21, 2010 | 2001 Chevrolet Tahoe

1 Answer

I have a 2007 Endeavor with the following problem: Air does not blow out of the front defogger to defog the windshield. You hear it blowing, but it is not coming out. I have switched the knob to change the...


The air flow is controlled by an actuator behind the dash. The part is sometimes called the heater control box. When you are selecting the air flow to change from the a/c controller. The signal is not being received to the actuator. The actuator is called the blend door.
You need to have the air /blend door actuator change. I think in this car is the air recirculation door. Same thing different name .

Good luck

Oct 31, 2009 | 2004 Mitsubishi Endeavor

1 Answer

The heating and air works but doesn't blow hot or cold air there is a part under the dash board that is missing some kind of valve,could you please help me with this


There is a blend door that is know to give problems. Sometimes the blend door itself will break but there is also a blend door actuator that can fail. The blend door actuator is located behind the dash...kinda behind the temperature control knob and is a pretty easy fix if you're able to hang upside down under your dash for about 20 minutes. The actuator costs around $50.
I've never replaced the blend door itself, but have read up on it when I thought that might be the problem. Let's just say the part is cheaper but clear your weekend. I think step one of building a Taurus is the blend door....it's buried in there.
Hope this helps.

Oct 25, 2009 | 1997 Ford Taurus

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