see above problem description
Jeep Q&AAsk Your Question
1993 Jeep Grand Cherokee Question: heat/ac fan is always on -never shuts off-even when key is off,fan still blowing
try unplugging your blower motor resistor to start with and see if that helps. iv seen this only one other time on a dodge b4
Replybbbnn, July 02, 2012, 16:54Rookie
Thanks for your response.This is what I thought it may be and previously asked a question as to the exact location of the blower motor resistor but did not get a helpful response. I will try that and see if it corrects the problem.Thanks again for your reply.
Most likely its a defective - Blower Motor Power Module