1993 Jeep Grand Cherokee Maintenance Question

I have a 1993 Jeep Grand Cherokee & have replaced the fan relay switch for the 4th time. The switch seems to last about 4-6 months but this last time it lasted 1 week & there is a black mark on one of the connectors. Is there something I can do to figure out this problem(sounds like a short to me) or will I have to see a professional? Thanks so much

Posted Aug 28th by Sandie Selph the owner of a Jeep Grand Cherokee Jeep, Grand Cherokee, Fan Relay, Switch, Electrical, Fuses

Answers from the Automotive Experts

Sandie, It is recommended to seek professional in any repair, if you have an electrical concern you may need to have your electrical system coming to and from the relay for a short. You may have a rubbed or chaffed wire in the harness that is causing your concern. A. J. Pierce

⟩ Answered on Sep 2nd, 2010 by Amanda J. Pierce, MBA "AJ", Certified Mechanic at VIGOR Alaska Industrial Shipyard

Hi Sandie, Yes, I agree with you! It sounds like a short to me too. Look between the relay and the cooling fan. Check to see if any of the wires are frayed or exposed. That would be the easiest solution. If not, the next simplest way to trace a short is using a 12V test light check. Again, check the wires between the relay and the cooling fan, where you have narrowed down the trouble. If you have no luck, a professional will also trace the wires and will not stop until they find the short. The repair itself is not costly. It is the labor to trace the short. Check the askpatty.com web site for a female friendly shop to go to. Good luck! Audra (the auto-motivator)

⟩ Answered on Sep 2nd, 2010 by Audra Fordin, Owner at Great Bear Auto Shop

Electrical issues are best left to professionals

⟩ Answered on Sep 2nd, 2010 by Barb Petrey, President - DBK Enterprises Inc at Jiffy Lube

Hello Sandie-a direct short would likely blow the relay immediately- as well as fuses- more than likely your fan motor is failing & drawing too much current- replacement of the fan motor should fix this problem- thanks Super Girls Auto.

⟩ Answered on Sep 2nd, 2010 by Laurie Sarno, Co-Owner at Super Girls Auto

Dear Sandie, The easiest thing to do is check the fuse for the switch. Look in your owner's manual and see what size it's supposed to be and then check your vehicle to make sure that it*s right. After that the next thing you*d have to do is see how much power is being sent to the switch and what it's supposed to get. If you don*t have a meter or a service manual for this vehicle it's probably best that you take it to a technician. They may be able to find the problem quickly and get you on your way. Good luck. Lori Johnson www.ladiesstartyourengines.com

⟩ Answered on Sep 2nd, 2010 by Lori Johnson, Owner and Instructor at Ladies Start Your Engines

Sounds like a bad connector or a bad fan. It could be drawing too many amps... Time to get a diagnostic test run to track down the problem. It's not common to go through that many Fan relay switches. YES, they can be defect, but that's too many in the amount of time your dealing with this... Do yourself a favor and get it in to get this MAYBE simple thing fixed!

⟩ Answered on Sep 2nd, 2010 by Pat Fleischmann, Director of First Impressions at Community Tire Pros & Auto Repair

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