AskPatty Certified Female Friendly Logo
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

Answers from the Automotive Experts

Amanda J. Pierce, MBA 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

Audra Fordin, Owner at Great Bear Auto Shop 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)

Barb Petrey, President - DBK Enterprises Inc at Jiffy Lube Electrical issues are best left to professionals

Laurie Sarno, Co-Owner at Super Girls Auto 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.

Lori Johnson, Owner and Instructor at Ladies Start Your Engines 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

Pat Fleischmann, Director of First Impressions at Community Tire Pros & Auto Repair 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!

Contribute to this question:


blog comments powered by Disqus

Related Jeep Grand Cherokee FAQs


  • i have a Jeep Grand Cherokee Loredo 4X4 6l engine i need to replace the radiator and i ... Read More
  • A few days ago I noticed my oil pressure was getting high....it would start up at about ... Read More
  • What do you think the problem could be? car runs great at high speed but sometimes when I ... Read More
  • Hi I have a 2000 Jeep Grand Cherokee, now that warmer weather is here, the temp gauge ... Read More

Need Car Advice?

Ask The Experts!

Looking for a New or Used Car?

Search for our Certified Female Friendly® Car Buying Marketplace locations

Help Our Charities