Question about 2003 Jeep Grand Cherokee

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The fuse for the cooling and heating systems keeps blowing when I use the turn signal I have a 2003 Jeep grand cherokee laredo. they must be on the same circuit. the fuse will only blow when I use both the heater and the turn signal at the same time together. could it be a defective flasher?

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  • vncntsbr Oct 08, 2010

    after furher observation i found the when i operated the jeep without using the heater and the fuse blew in about 24 hrs using only the turn signal. this i think will rule out the heater/cooling system as a cause of blowing the fuse. could it be a defective flasher or a short in the steering colunm?

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I have the same problem and am going to trace wires for shorts-what I am reading is 80% of the time its the flasher module. Keep in mind the emergency flashers will work even though the fuse is blown and flasher module may be faulty. Flasher modules run about $70 on average-so be careful you don't roll the dice on the fix and be out $70. Again-if I cant find visible shorts, I'm replacing the flasher module. Check the internet for discussions on this subject-it is a very common problem with the 03s. Let me know if this was your fix if already repaired. Thanks and/or good luck.

Posted on Oct 29, 2010

  • vncntsbr Oct 31, 2010

    if you are still having this problem check a wire which is plugged into the oil pan of the transmission on the driver side of the car. in my case this 3 wire plug was shorting out the insulation was gone. when the wire was shorted out the turn signal worked and he heater fuse blew. i fixed the wire and all is working fine the big question is that what does a wire connected to the transmission have to do with the turn signal and heater. if any one has this problem with a jeep grand cherokee check this wire first. the dealer wanted $200-300 to fix it. it cost me lest than $10.00 and a couple days to find the short

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