94 jeep cherokee heater diagram diagram base website heater

JavaScript seems to be disabled in your browser. For the best experience on our site, be sure to turn on Javascript in your browser. Welcome to HeaterTreater. No Mechanical Experience Required We have Motors! Chances are it's caused by a common blend door failure. The blend door is a small plastic door inside your car that regulates the flow of air through your heater core. It's a small, inexpensive part, but it's buried in the heater box and the dealer repair requires removing your steering column, your dash panel, disconnecting your AC system and radiator in order to remove the heater box, only to replace the blend door with the same weak, poorly-designed part that failed in the first place.

But Heater Treater has developed a far easier and cheaper way, that anybody with basic mechanical skills can do. Heater Treater provides an easy-to-install custom solution to the common blend door problem. Our fix often takes as little as an hour to complete, even by someone with no mechanic experience. We offer ongoing customer support and detailed written instructions as well as video demonstrations. If you feel uncomfortable doing the repair yourself, go Here to find a HeaterTreater certified garage near you.

We are American made.

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We do not outsource parts or skimp on quality in any way. Using cheap Chinese plastic parts will lead to failure in the future. Our parts are steel and guaranteed by us to last for the life of the car.

We are the experts in this field. Our company is a team of engineers who offer full customer support. When using our product, help is only a phone call away. Don't be left stranded by the other guy!

I followed your instructions and took my time and it worked out great.

94 jeep cherokee heater diagram diagram base website heater

If I can do it, anyone can! My '97 Ford Expedition was very chilly in northern Canada. I told them to leave it. I typed in HVAC system on my computer and came across you! I asked my husband what he thought and he said to try it, and it is awesome!

They wanted to replace the heater box, heater core and blend door and when I think of the money and time saved, I am in awe. My 65 year old dad and I put it together in an afternoon and I am so proud for finding you. I love you guys! If you have a specific question or concern, feel free to Contact Us.

Toggle Nav.If the heater in your Grand Cherokee isn't working properly, several things could be the culprit. It usually isn't serious or tough to work out, but the heater core can be a chore. If the heater core has gone out in your Grand Cherokee, the heater won't work. The heater core is a small radiator-type unit located way up under the dash area. The blower fan uses the heat created by this unit to blow hot air into the cab. Because the heater works directly off the engine's hot coolant, if the system is low then no heat can be produced.

If the blower fan turns on and you don't have any leaks under the dash of your Grand Cherokee, check the radiator's coolant level and top it off if it is low.

The blower fan is responsible for moving the heat from the heater core to the vents. If it is not working then your heater settings will not work. Check the fuse panel in the Grand Cherokee first, and if the fuse is okay then it may be the blower fan motor itself which has stopped working. This article was written by the It Still Works team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information.

To submit your questions or ideas, or to simply learn more about It Still Works, contact us. Blower Fan The blower fan is responsible for moving the heat from the heater core to the vents. About the Author This article was written by the It Still Works team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information.

Photo Credits car heater vent image by robert mobley from Fotolia.Orders Comparison list Return requests Wish list Track my order s. Track my order s. Sign in Register Email. Password Forgot your password? Register for a new account.

94 jeep cherokee heater diagram diagram base website heater

Sign in. Remember me. Connect with our Jeep Expert! Cart is empty. View cart. Diagram Part 1. Part : Defroster Vacuum Actuator. Add to cart Add to wish list Add to compare. Part : AA. Diagram Part 2. Fits: Jeep Wrangler TJ. Air Conditioning Evaporator Core. Diagram Part 3. Diagram Part 4. Diagram Part 5. Availability: Availability: In Stock. Diagram Part 6. Part : AB. AC Compressor. Part : AC. Diagram Part 7. Diagram Part 8. Part : AC-K. Air Parts, AC Kit.How do I fix my heater?

Blend doors are small airway control doors that move into positions to blend hot and cold air to your liking based on where you have the temperature setting knobs positioned. The material has caused them to be weak and brittle allowing them to fall apart leaving you with icy cold air as the only option.

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That's fantastic if you live in Florida or Arizona in the summertime but for the rest of us we are going to need our heater. Complete the final Check List here. We have outlined a way to see if your heater blend doors have failed.

If you have no heat on the drivers side - this test will work for you. If you only have no heat on the passenger side only, please use the electronic method outlined above. Please follow the steps below. The code numbers will be displayed on the screen one at a time. For more failure codes click here. If you see the codes 54 and 56, you are in the right place! Once all codes have been displayed, the system will repeat the fault code numbers. This will continue until the ignition is turned off.

Record all of the fault codes. These plastic doors blend doors are what determines how much heat and cool air you receive when you turn the temperature knob on the dash. If you turn the knob for hot air, they move up. If you turn the knob for cool air, they move down. These little doors are made of a cheap plastic that falls apart after a while allowing them to fall down in the cold air position.

This causes the loss of temperature control - mainly the loss of heat. The OEM factory made blend doors are cheap and prone to cracking. The little drive motors used to move them up and down are very strong and can put too much pressure on them causing them to crack, break and eventually fail.

Once broken - your heater stops working. Labor Charges! The dealerships and auto repair centers do things "by the books" and they have plenty of reason to. Lots and lots of labor when done their way. The dealerships rules require them to drop the steering column, remove the center console, evacuate the AC system, pull off the entire dash, drain out the vehicles coolant, disconnect the heater core and disassemble all of the heater box.

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That's a ton of work and flag hours. That adds up to big bucks for them. Do you have the problem? The usual symptoms are that one side of the cabin will loose heat, followed by the other side at some point. Air Conditioning is working on cold but not hot no matter the control knobs setting.

You can electronically read the fail codes on the system by following this procedure:. It's really that easy! The hardest thing to do is make the first cut. This job will take between 30 - 45 minutes for most people. Click here for complete online detailed instructions with photos.

Click here for printer friendly instructions. Choose an option below for more detailed instructions with photos.JavaScript seems to be disabled in your browser. For the best experience on our site, be sure to turn on Javascript in your browser.

This is a kit to do a complete repair on the blend door malfunction that is common to the 01 Jeep Cherokee. Every Cherokee in this range either has, or will have, this common failure. The pictures show the hardware provided for the fix. All work is done from the foot area of the passenger side of the Jeep, with a Dremel cut in the bottom of the heater box Once completed, the alterations are under the dash panel in the foot area and are not visible.

The work to install the fix is relatively simple and can be accomplished by the average shade tree mechanic. The work could easily be done by any local independent garage. Product returns are accepted within two weeks for a full refund minus shipping. The standard fix for the blend door failure is to remove the heater box and replace the plastic door. Removal of the box requires removing the dash panel, evacuating and disconnecting the AC compressor, draining and disconnecting the heater hoses.

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Fixing the door is relatively easy, but the labor and cost of getting to the door makes this a time consuming and expensive job. The HeaterTreaterTM avoids the hard work by providing a kit that allows the repair to be done with superior components without having to disassemble the automobile. The blend door controls air flow through either the AC evaporator or the heater coil, or any combination in between.

The doors are controlled by a stepper motor. The issue with the system is that the drive motor has a wider range of motion than the movement of the door will allow. At the extents of movement full heat or full ACthe motor overdrives the plastic blend door into the the internal stop point in the heater box until the motor stalls. This is considerable force on the door and over time, the door cannot withstand the force and will break.

Once the door breaks, you lose control over the ability to regulate between heat and AC. The process entails removing the heater box which requires - removing steering wheel and steering column, removing radio and all dash panel control modules, unbolting all attachment points for the dash panel, evacuating and disconnecting the AC compressor, draining and disconnecting the radiator, removing engine side bolts that hold the heater box in place.

Once the box is removed, the fix is relatively simple, but you still have cheap plastic doors and the problem will occur again.

The usual symptom is an inability to effectively control the temperature of the HVAC system. The door hangs on a vertical axis, so turning a sharp corner, or fiddling with the fan speed can swing the door into the hot or cold position randomly. While the symptoms are fairly conclusive for blend door failure, the only way to really check it out is to remove the blend door actuator motor and look at the axle.

The blend door actuator motor is located in the upper left hand corner of the passenger side foot well. The picture below show the location of the motor. Once you have detached the motor, you can turn the HVAC system on and observe the movement of the motor by turning the temp control knob. You want to make sure that the motor is moving properly.

The motor attaches to the blend door using two different connector schemes depending on the model year as shown in the second picture. You can grasp the axle with your fingers and feel the extents of movement of the door by turning the knob. You should be able to manually regulate between heat and AC by turning the axle. The door should hit a hard stop point when you turn it to heat or AC and not have any play beyond that point.

If the axle is broken or feel disconnected from the door, this is a definitive indication of a broken blend door. It's hard to explain exactly what it feels like, but you should be able to switch from AC to heat and feel a solid stop at the max AC and heat positions. If the system is loose or ineffective, the blend door is the problem and the HeaterTreater is the solution.

This kit replaces the plastic door and axle with stainless steel components that can withstand the force and will last longer than the Cherokee. All work is done from the passenger side foot well, and no disassembly of the dash or evacuation of the AC system is required.

Tools required are a screw driver, pair of pliers, and a Dremel tool if you don't already have one, this is a good excuse and the tool has many uses. My favorite tool for the work is a Harbor Freight mini benchtop grinder with a flexible rotary cutter attachment.Thanks for a well thought out site, and permission to borrow content. I'll show you my solution to the kit from Jeep. I was able to remove and manipulate the outside most blend door actuator, connector and door without any issue.

These both will be very easy to find at your local home center. The concept of the repair is to rivet the truss plate to the hinge, manipulate the hinge barrel to work on the OEM connector, and cut everything to fit. First I had to remove the pin from the hinge. Use the side of the hinge that has 3 barrels, not the side with 2. Using the OEM connector the white piece test the fit. Mark a line where material is to be removed to allow the key to fit.

The fit between the OEM connector and the hinge has to be incredably tight. The amount of torque that is aplied to this piece in insane. Now that your door is assembled, trim it to fit using the old doors as templates. Repeat steps for the other door.

Cut the head off of one of the hinge pins to serve as the connector between the 2 doors. This step requires the most patience.

Jeep Grand Cherokee Heater Problems

To install the far blend door you will probably not be lucky enough to have the connector key in the right place. No worries - disconnect your battery for about 30 seconds and reconnect. This clears the Automatic Tempature Control computer and it will run the calibration test automatically. Turn the ignition to run and turn the climate control on.

The actuator will begin to rotate clockwise. Push the new door onto the connector and slide the connector pin all the way into the installed door. Install the second door, sliding the connector pin into the far side of the second door.

94 jeep cherokee heater diagram diagram base website heater

Align and snap in the near connector. Reinstall the near actuator and test. When you put the ignition to run and turn on the climate control system it will run though the calibration test that broke the OEM equipment to begin with.

Watch the doors move, and pay attention to the amount of torque applied to the doors - the plastic ones didn't stand a chance! Once you are satisfied the connection is secure, duck tape the doors to cover the holes.

Replace the cut piece of plastic and tape, and you're finished. Why didn't you put the foam sponge like in the original design? If I could just add, the hinge that I used was one that the pin just slid out ofso basically one less step.

Reply 7 years ago on Introduction. This is some good info, such a bummer it happens to so many JGCs. I'm not sure what a heatertreater is - care to explain? I agree though - something so "simple" and it leaves such a bad impression on most Jeep owners. Reply 5 years ago on Introduction. Heatertreater is a brand of aftermarket blend door replacement or fix, instead of a Dorman or JGC Parts. That's all.Downloads Jeep Cj7 Heater Wiring Diagram jeep cj7 heater cable diagram jeep cj7 heater cables jeep cj7 heater box jeep cj7 heater parts jeep cj7 heater box restoration project rowdy jeep cj7 heater jeep cj7 heater core jeep cj7 heater blower jeep cj7 heater controls jeep cj7 heater box rebuild kit jeep cj7 heater hose routing jeep cj7 heater core replacement.

Diagram Base Website Full Edition. There are many different questions which may be asked about what's the significance of crossing a line in a phase diagram. Often, it's this question that causes many of us to misunderstand the problem or misinterpret the intent of the diagram.

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Should you understand the purpose of a phase diagram and where it comes from, you'll also have a better comprehension of how it works. The importance of crossing a line in a stage diagram lies in its function in demonstrating the transitions between phases.

A simple phase diagram may include only one line linking two phases, which functions only to display the transition from one stage to another. If we want to know more about the changes between phases, it's useful to present another line. Crossing a line in a phase diagram is the process that is used to reveal where that line comes from. As we have already discovered, it's the first line that represents the stages that make up the item.

The second line connects each phase, giving a glimpse to the stage change from 1 phase to another. Now, some people might be wondering why a diagram could have another line. The rationale a phase diagram is used in this way is because there is not anything more revealing than analyzing the actual behavior of a circuit as it changes from one phase to another.

DIY Fix for Jeep Cherokee A/C Blend Door Failure

The information can be conveyed simply by watching a circuit along with identifying the stage that changes from 1 point to another. A phasor diagram is often used when a designer is looking for an option. Whenever there's only 1 choice between two stages, it is likely to just select one and leave the other out. This usually results in developing a bad item.

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When a programmer uses a phasor diagram, it's important to ensure that all points are displayed. The association between points is an important element of the last diagram.

Because you might be applying a blend of phases, you should also indicate which combinations of phases you're working with.