Blend door actuators. If you have the AZC system (automatic zone control) used in the limited (the one with dual digital readouts) you can use the on board diagnostic to read the code. while running, press the a/c and recirc buttons at same time then turn drivers temp control one click clockwise. release a/c and recirc buttons. If you have codes that show up, write them down and google search for these codes. It will tell you exactly what is wrong.
Thermostat or heater core bad
FIRST THING I WOULD CHECK IS UNDER THE HOOD AFTER THE VEHICLE IS WARMED UP FEEL THE HOSES GOING THROUGH THE FIREWALL TO THE HEATER CORE TO SEE IF THEY ARE HOT AND THE SAME TEMP.IF NOT THE HEATER CORE MAY BE PLUGGED.WHEN THE ENGINE IS COOLED YOU CAN UNHOOK THE HOSES AT THE ENGINE AND FLUSH WITH RAD CLEANER AND WATER MIX .POUR IN ONE HOSE AND CATCH IT IN A CONTAINER ITS POISONOUS.THEN POUR BACK THROUGH THE OTHERE HOSE TO FLUSH THE OTHER WAY.YOU CAN FILTER IT WITH A PAINT FILTER OR PANTY HPSE,RINSE WELL WHEN DONE WITH WATER. THIS IS A CHEAP FIRST STEP I HOPE IT HELPS.EFBIL
My Jeep start with similar problems,
AT the moment that I turn on the system just the right side blow hot air and today morning no onw of the sides do.
Does anyone have the heater system diagram>?
I will go and check first my core and hoses!
I will keep you posted !
I put a new radiator in and whent the jeep is running it over heat what could it be
My 2000 jeep cherokee ,the heater fan only works on high
You most definitely have a broken blend door. Typically the fix for a broken blend door is expensive because a mechanic will remove the entire dash and replace the plenum assembly. There is now a diy kit at www.heatertreater.net which provides instructions on how to replace the broken plastic blend door with steel components, by removing the glove box and making an incision in the plenum box rather than removing the entire dash. The fix saves a lot of time and money, and is worth serious consideration if you have a broken blend or recirc door.
Blend door?????? lol ... its a resistor (Blower resistor)
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