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Robert R
Robert R, ASE Certified Technician
Category: Jeep
Satisfied Customers: 4533
Experience:  ASE Master Certified, Jeep Certified
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Electric Cooling Fan on 1999 Jeep Cherokee does not work.

Customer Question

Electric Cooling Fan on 1999 Jeep Cherokee does not work. When manually control relay the fan comes on. I believe I need schematic to test further.
Submitted: 2 years ago.
Category: Jeep
Expert:  Robert R replied 2 years ago.
Hello, welcome and thanks for asking your question. My name is***** a Certified Auto Technician with 27+ years experience. I will do my best to assist you. please keep in mind that I may need to ask questions of you before I can answer. When you reply please feel free to add as much detailed information as possible pertaining to your concern.
What are the symptoms? Is the vehicle overheating? Is the check engine light on?
Customer: replied 2 years ago.
No check engine light or codes. If vehicle sits and idles for too long it will overheat. Electric Cooling Fan does not work even with A/C on.
Expert:  Robert R replied 2 years ago.
Let me see what I can round up for you. I need some time to gather the diagram for you... Thanks for your patience and understanding while I research this for you....
Thank you,
Expert:  Robert R replied 2 years ago.
At this time, it is possible that the Coolant Temperature Sensor has failed "in range" and has not set a fault code. You would need a scanner to compare the Coolant Temperature Sensor reading with actual coolant temperature to verify this..
Other than that, here is the wiring diagrams for the Radiator Fan Relay and Fan Motor..

Here is a diagnostic flow chart for the radiator fan...
Attachment: --Click here-- to view.
Keep me posted and let me know if you have additional questions...
Thank you,
Expert:  Robert R replied 2 years ago.
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Customer: replied 2 years ago.
I have not made all the checks from diagnostic tree. I will today. That said, I think I need to trace signal wire to relay, which means I need schematic. When I take cover off relay and manually operate relay, fan comes on. So where does signal come from on this vehicle.
I will be working on around noon today.
Expert:  Robert R replied 2 years ago.
Can you post the last 9 digits of the VIN so I can gather correct service info for you??
Thank you,