Questionhello, i hope you can help with this, i have a 1996 grand cherokee, the blower motor for the heater/ac runs all the time(even with the key off),the only way to shut it off is to unplug it or pull the maxi fuse under the hood, any idea what could cause this? there was a recent leak in the passenger floor(stopped up a/c drain) but i could find no apparant damage, all wiring is original(nothing ever done to it)i can't find a short anywhere,(i also cant find a TSB relating to this)any help appreciated thank you GEER.
AnswerNO: 24-06-96
SUBJECT: A/C Evaporator Drain Blockage
DATE: June 28, 1996
SYMPTOM/CONDITION:
Debris may collect in the evaporator drain tube area causing blockage of the tube. This can lead to water leaking from the heater housing, water sloshing around in the housing and odor from decayed organic debris. This bulletin provides instructions to gain easy access to the drain tube for clearing foreign matter from the tube, without removal of the heater A/C housing.
DIAGNOSIS:
Operate the system in the A/C mode and verify that water is draining from the system. The water drains into the frame rail and exits in the center of the vehicle. If no water is draining, the system is blocked and requires cleaning.
PARTS REQUIRED:
Quantity
Part No.
Description
1
5255217
Plug
REPAIR PROCEDURE:
This bulletin involves drilling a hole in the A/C evaporator housing to allow for cleaning of the drain tube.
Pull the carpet down in the passengers foot well and locate the evaporator drain in the housing ( See Illustration).
Drill a 1/4 inch hole in the center of the drain tube housing as shown. Clear the drain tube with a wire or suitable tool by inserting it through the hole and into the drain tube.
Insert plug, P/N5255217 into the 1/4 inch hole drilled previously.
Verify that the drain is clear by operating the system in the A/C mode and observing that water is draining.
POLICY:
the blower motor resistor power module will need to be replaced.
