Failure in the blower motor power module (automatic temperature controls) or resistor block (manual AC) may cause the heater blower motor to work only on the high setting. The connector to the power module/resistor block is known to overheat (and sometimes melt). The connector or terminals should be replaced; a replacement connector is available.
Car Problem Reports
Jeep Grand Cherokee AC Blower May Only Work on High or Melt Connector at Blower
Jeep Grand Cherokee Problem
Average Mileage: 108,928 mi (48,000 mi - 160,000 mi)
My experience with the ac blower connector melting is one of the flaws in that year of jeep. I simply cut that connector out and put a connector from Dorman® Tech Choice™ - Blower Motor Resistor Connector Part # 973-304 $9.99 can be purchased from Orielly auto parts or online at Dorman.com.. Replaced that connector and I have (NOT)had that problem again. One of many poor designs flaws from Chrysler.
Visitor, 2003 Jeep Grand Cherokee, 160,000 mi
2nd time this module melted.
Visitor, 2002 Jeep Grand Cherokee, 120,000 mi
Wires at the heater blower resister burnt and melted the resister. Had to replace wiring and resister
Visitor, 2001 Jeep Grand Cherokee, 124,000 mi
Blower controls would randomly turn on / off. Wire was melted near the resistor. Replacement took place on 02/2011 and cost $190.00
Visitor, 2004 Jeep Grand Cherokee, 102,000 mi
ac/heat only blows out on high, there are no mid-level blow levels
Visitor, 2000 Jeep Grand Cherokee, 100,000 mi
I just needed another connector installed and made the mistake of taking my 2000 jeep to Suncost Chysler in St. petersburg FL. After they were done with my car it cost over $1800.00 as they broke my vent doors after replacing not only the connector but the resistor. It now required removal of the dash to fix vent doors. All these systems worked fine when brought into Suncost. After they removed the dash they claimed the condenser was leaking freon. This car could freeze your legs before they got ahold of it.
Visitor, 2004 Jeep Grand Cherokee, 120,000 mi
Blower motor resistor block strip failure. New resistor over $100 so I tried just resoldering the resistor block and it has worked fine since. That was about nine months ago.
Visitor, 2004 Jeep Grand Cherokee, 127,000 mi
I just purchased this vechicle used, and the first thing to go wrong was the bender doors. i brought back to the dealer and made them repair. Now my heater works on occassion. I discovered that the wire is loose at the resistor. I have not made the repair yet. I am going to try replacing the wire and connector first. I do not want to spend more than this truck is worth!!!
I'm going back to Chevys!!!
rewired the terminal ends
Visitor, 1999 Jeep Grand Cherokee, 120,000 mi
my blower freaked on high and then stopped working all together and it was smoking really bad and smelled like burnt rubber