2002 Jeep Grand Cherokee Limited Blower Motor Resistor Diagram

ImperialCrown said:

There may be an orange lock-tab that has to be slid ~1/8" over to then depress the latch and pull the connector off.
This is a high-current circuit. It is possible that with a poor connection (i.e.-high resistance) the plastic has melted from excessive heat. Take a closer look at the situation if you can.
If terminals have overheated and discolored, I would replace both the module and connector.

Good thought; I will examine the connector more carefully. I know the type of connector with both the sliding lock and the push tab release because that is what is used in the tail light assembly of this Jeep.

I had to remove both tail light assemblies and fiddle with the connections to make it pass state inspection. Both tail lights and both brake lights were non functional. The problem was not the connector with the sliding lock, but the contacts in the tail light housing which the twist in bulb holders make contact with. The dealer service advisor once told me that the only repair is to replace the tail lamp assembly, but I have made a temporary fix by bending up the contacts in the tail light assembly. This enabled it to pass inspection on the second try. I think a more permanent repair might be to insert a shim under the contact to be it raised up.

It was while driving over to get the inspection that I discovered that the heater fan was not working. The immediate job was to take care of the tail and brake lights, only then did I turn my attention to the heater fan. My relative that owns this Jeep doesn't used it much and I had to set up a battery maintainer (0.8 A max) to keep the battery from going flat.

However having a working heater (and especially a windshield defroster) is a safety item in that a fogged up windshield is extremely dangerous. Alternatively freezing rain can coat the outside of the windshield while driving. Once in about 1960, when I was 16 years old, four friends and I were driving around in icy weather. The vehicle was an old Studebaker driven by the owner, Dan, and it did not have a functioning heater. The wipers were the old vacuum type which would slow down if the intake manifold vacuum lessened under acceleration.

We drove into freezing rain and Dan could not see to drive. We stopped and scraped the windshield, but it was soon coated again. At a filling station we got a can of spray de-icer, then sprayed, scraped, and wiped the ice away and got underway again. However the windshield was soon coated again and we had to pull off the road to re-spray. We were on Forest Lane in Dallas which at that time was a 2-lane high-crowned asphalt road with no paved shoulder falling away in broad ditches on both sides.

During this stop someone came up with the idea of one of us sitting on the hood and to spray de-icer on the windshield so we could drive. It wasn't my idea; I did not like the idea; I didn't volunteer and refused to be drafted. One guy took on the challenge and we were off with four of us in the car and one guy perched on the hood clutching a can of spray de-icer in one hand and I guess holding on somehow with the other hand.

We were hardly underway when the driver lost control and the car began to yaw back and forth. Looking through the windshield I saw the guy on the hood go from being concerned to being scared. He dropped the can of de-icer and put one hand on each of the arms of the moving windshield wipers. After a couple of cycles one of the wipers one came off the post. I looked right into the face of the guy on the hood and he was terrified.

The car slid across the center line, did a 180 and came to a stop in the ditch on the opposite side of the road. Somehow the guy didn't fall off and no harm was done.

Source: https://www.allpar.com/threads/heater-blower-fan-not-working-2001-grand-cherokee-ltd.152918/

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