2001 Cherokee - no heat & it's cold outside


Clark21221
01-16-2008, 05:54 PM
This is my first time on any forum. I'm frustrated! The heater in my 2001 Jeep Cherokee Sport works intermittently. And it's cold, cold, cold outside. The fans works but it blows cold air. The temp gauge registers OK and the engine runs fine. Once after I drove for an hour the fan finally started blowing hot air. Sometimes I get heat; and other times I don't. Any suggestions?

dave92cherokee
01-16-2008, 06:26 PM
Check the heater control valve under the hood. The vacuum line might have come disconnected or have a hole in it. Best way to check is let the engine get to normal temp and then turn the heat on full blast and feel the rubber hoses going into the firewall and see if they feel hot or cold if cold then problem is around the heater control valve if hot then you might have a problem like a clogged heater core.

AlohaBra
01-17-2008, 09:50 AM
Note: the late model Xjs including the 2001 does not use a heater valve.

Both heater hoses under the hood should be hot to the touch. The heat to the floor inside the cabin is control by a blend air door in the heat/AC unit in the vehicle.

The blend air door in the 2001 model is electric and controlled by the panel electrically.

From service information (2000 model year):

BLEND-AIR DOOR MOTOR
WARNING: ON VEHICLES EQUIPPED WITH AIRBAGS,
REFER TO GROUP 8M - PASSIVE
RESTRAINT SYSTEMS BEFORE ATTEMPTING ANY
STEERING WHEEL, STEERING COLUMN, OR
INSTRUMENT PANEL COMPONENT DIAGNOSIS OR
SERVICE. FAILURE TO TAKE THE PROPER PRECAUTIONS
COULD RESULT IN ACCIDENTAL AIRBAG
DEPLOYMENT AND POSSIBLE PERSONAL
INJURY.

REMOVAL
(1) Disconnect and isolate the battery negative
cable.
(2) Disconnect the wire connector from the blendair
door motor.
(3) Remove the screws that secure the blend-air
door motor to the housing (Fig. 15).
(4) Remove the blend-air door motor.
INSTALLATION
(1) Reverse the removal procedures for installation.
(2) Install and tighten the screws that secures the
blend-air door motor to the housing. Tighten the
mounting screws to 1 Nm (10 in. lbs.).
(3) Connect the battery negative cable.

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