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Old 12-09-2014, 10:15 PM
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I have an electrical issue that is driving me crazy

I recently purchased a 1996 Jeep Grand Cherokee, used of course.

Everything on the Jeep worked just fine at the time of purchase with the exception of the heater blower, which the dealer repaired.

After repair the heater/air, regardless of how hi you twist the knob, would only just barely come out of the vents, and even then, the only vents that really seemed to have much flow were the defrost and the floor vents, at one point only cold air would blow.

It was suggested that this was a vacuum issue or that the gates were not opening/closing but this was disproved and you can very clearly hear the “thunk” when you turn the heat on. When the system worked however there was still the issue of only working at a fraction of the pushing power it should have had.

This issue continued for roughly a month and I was intending to take the vehicle in to have this specific issue corrected by the dealer as every other shade tree expert, including myself, has come up empty handed in trying to understand the specific issue.

5 days ago the heater died completely, the display went out, you cannot even hear the fan running… It’s dead Jim. So I proceeded to track the obvious problems and solutions and found the fuse for the heater was blown, I replaced it, it blew again immediately, I replaced it with a higher amp fuse… it also immediately blew.

The dealer asked me to bring the vehicle in and as I was doing so today, I mean, literally as I was backing out of the parking spot to go to the dealer, the radio died, the interior lights died, my turn signals died, and power seats no longer function.

I managed to make it to the dealer and as expected one fuse on the small board was blown and then it was discovered that one of the 50 amps under the hood was blown, these were replaced, however, the heater still does not work, the turn signals do not work, my interior lights do not work etc… It is worth noting that these blown fuses were all checked as recently as 3 days ago and were in fact in tact at the time.

For some reason the Jeep is blowing fuses on these specific systems and we cannot seem to track the issue.

When I was attempting to fix this problem when it was simply the blower motor that was not functioning all signs pointed to either the motor itself being blown or the resistor behind the instrument panel being blown.

So my question is this.

What is wrong with my Jeep?
If I replace the blower motor or resistor will this correct the electrical issue? Meaning to say, is it possible that the issue with either of these two could create an environment that would then cause other systems to be affected in the manner in which I have described? And if so, when the motor or resistor is fixed will that give me back the functions I have lost?

Other “fixes”: It was suggested that I check the cabin air filter to make sure it was not clogged and thereby obstructing the fan to the point of causing an overworking issue that blew the fuses and started the cascade. My Jeep is not equipped with a cabin air filter but there was a good deal of debris present in the trap, certainly not enough to restrict airflow however. The debris has been cleared but I am still left with the issues as described above.

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Old 12-11-2014, 07:22 AM
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Re: I have an electrical issue that is driving me crazy

Wellcome to the garage.
First of all its not a good idea to replace a fuse with a higher rated one. The fuse sits in a circuit to protect the wiring and is rated so that it will blow as soon as a maximum Amps for that wire is reached. Putting a higher rated fuse could cause the wire isolation to melt and cause a short in between wires.
Regarding the fan, it can be that it runs in the wrong direction, making normal noise, but almost not supplying any air. Swapping the wires on the resistor would help in that case.

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