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could be your temperature controls are stuck. a vacuum or cable operated flapper that closes off the heater core when a/c is in use, or allows cool outside air in. it is under the dash where the air comes out by the passengers feet, sometimes you can move the levers by hand if the cables are...

Check the coolant level. My 2000 Jeep Cherokee has a constant flow cooling system and the heater will not work if the coolant level is too low. ________________________ jeep grand cherokee parts Direct OE Replacement Parts