Question about 1996 Jeep Grand Cherokee

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1996 Jeep Grand Cherokee Limited. The Automatic Temperature Control system only blends in hot air when the thermostat is set above the numerical choices to the setting High, whats wrong?

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  • Jeep Master
  • 14,585 Answers

Replace the controller..Done a few of these.

Posted on Nov 11, 2014

  • amyjhodgson Nov 11, 2014

    Thank you. And, ummm, what is a controller?

  • Randy Ohler Nov 11, 2014

    The controller is what you use to set the temperature, or where the air blows. In the dash. with the knobs.

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1 Answer

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Hello! The Blend Door Actuator (motor) is defective...The temperature/blend-air door motor is used on all models, whether equipped with manual or automatic temperature control. This motor is located under the heater-A/C housing directly over the floor panel transmission tunnel, and can be removed from the passenger compartment without instrument panel or heater-A/C housing removal...See diagram below...

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My 2000 Grand cherokee only blows warm air from defrost or any vent, 105 to 110 on a 32 degree morning with high fan, about 10 degrees warmer on low fan. It gets warmer when it warms up outside.Engine...


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In the heating and cooling system you have doors that open and close to give you warm and cold air and a mix of both.

What you have is an arm that pulls a door with peg on top, the peg tends to snap off. As you said your dealer replaced the blend door or doors I would take it back as is has blend door all over it.

Yahoo and youtube "jeep grand cherokee blend door repair"

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Since your blower is working and it is a heat issue,thats where we'll start,First thing is have you checked the coolant level in the radiator when engine is cold,make sure it is filled to top,next verify you have coolant in reserve ,Start your van and get it up to normal operation temperature,If your heat gauge on the dash works correctly it should be 190 degrees,Now lift the hood and locate the two heater hoses going into the heater assembly at the fire wall,Both hoses should be hot to hold on to,if both are hot and no heat inside your problem will be the blend air door in heater assembly.
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1 Answer

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Probably broken blend doors if everything else is working, but its just blowing cold air. Do a google search for "Jeep Blend Doors" or "Heater treater" for more info.

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1 Answer

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If jeep is a limited model it has automatic temp control for the heater blend door, it is controled by a electric motor, and can be problematic with age,sometimes it makes a clicking noise when the blend door is stiff ,which then it must be lubed and freed up

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