Question about 1999 Jeep Grand Cherokee

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Ok I have no heat in 1999 jeep grand cherokee limited. I replaced the heater core, blower motor and blower motor resistor. Cannot figure out what the problem is

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Maybe bad blend door

Posted on Feb 13, 2011

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2 Answers

How do I fix my heater in my 99 jeep grand Cherokee


There are two systems to evaluate.
  1. Air Blows Fine but not Hot -> Check Thermostat and coolant level.
  2. No Air Blows -> Check Blower Motor, Blower Motor Resistor Pack and Blower Control in Dash

Nov 14, 2014 | 1999 Jeep Grand Cherokee

1 Answer

How do i change blower motor resistor on 99 jeep grand cherokee


Welcome to FIxYa.com



Blower Motor Resistor and Controller Replacement

Image Blower Motor Resistor Or Controller/Power Module Remove/Install

REMOVAL

1. Disconnect and isolate the batten' negative cable.

2. Depress locking tab and unplug the wire harness connector from the blower motor

resistor or controller (power module).

3. Depress locking tab and unplug the resistor or controller connector from the blower

motor.

4. Remove the 2 screws that secure the blower motor resistor or controller to the

heater-AC housing.

5. Remove the blower motor resistor or controller from the heater AC housing.

INSTALLATION

1. Install the blower motor resistor or controller to the heater AC housing. The

housing is indexed to allow (controller power module) mounting in only one

position. Tighten the mounting screws to 2.2 Nm(20 in. Lbs.).

2. Plug in the wire harness connector to the blower motor resistor or controller.

3. Plug in the connector from the blower motor resistor or controller to the blower

motor.

4. Connect the batten' negative cable.

leedavidian_45.jpg



Thank you for using FixYa.com

Regards, Lee Davidian

Nov 22, 2010 | 1999 Jeep Grand Cherokee

1 Answer

1999 jeep grand cherokee heater fan quit. 40amp fuse under hood good. both wires at motor test hot. motor turns strong when wired direct to battery. now what?


the blower motor resistor is bad replace it and it will work good as new the resistor is located in the same heater box as the blower motor mounted on the outside of the heater box follow the wirring from the blower motor to find it or just simply buy the part and match it up

Jan 11, 2010 | 1999 Jeep Grand Cherokee

1 Answer

Getting heat in the heater core,heater door are opening, but no heat coming out the vents,help thanks


It sounds like the blower motor is not working. If you don't hear it running when you switch it on, check the fuse first. If the fuse is OK, you will probably need a new blower motor. It could also be a faulty fan switch or blower motor resistor. Once you remove the blower motor assembly, you can test it by putting battery voltage across the contacts with jumper wires, making sure to get correct polarity. If it does not spin, it should be replaced. If the blower does work when removed, the fan switch is probably at fault. The resistor is usually indicated when the fan works only at certain switch positions, but not all.

Dec 19, 2009 | 1998 Jeep Grand Cherokee

1 Answer

1999 Jeep Grand Cherokee the heat is not working or blowing?


2 problems?
No blower motor: Blower motor resistor very common or motor itself or heater controls.
No heat: Start simple with check antifreeze level after vehicle has sat for a few hours. If that's OK then it could be thermostat, heater controls, blend doors, water pump, restriction in cooling system

Oct 17, 2009 | 1999 Jeep Grand Cherokee

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