Question about Jeep Grand Cherokee

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I have an electrical issue that started with my heat/ac blower motor and is now affecting other systems. I need an expert...

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?

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  • Eric Kimbrow Jr.
    Eric Kimbrow Jr. Dec 10, 2014

    I have not tried that, but I have inspected the air filter and it seems to be relatively clean. I will however attempt this and report results.

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  • 41 Answers

Hello, have you tried removing the cabin air filter from the inside of the vehicle if equiped? i have seen these so clogged that the motor has blown fuses because it cant blow any air through the filter

Posted on Dec 10, 2014

Testimonial: "Okay. Just went out to check if this was the issue. My Jeep is not equipped with a cabin air filter but there was a good amount of debris in the trap, however, not enough to significantly impede airflow."

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1 Answer

Why does My thermostat Not switch between ac,heat,defrost . there's cold air coming out of vents but not cold enough to be ac. Initially when this started the ac was blowing hot air


If the air flow cannot be controlled from vent/defrost/floor you may have a blend door issue. This is an electric motor that operates a door in the heating system to control airflow. There are usually 3 motors controlling airflow direction,heat and recirculation. The Ac not blowing cold may also be another problem. If the AC is operational, the compressor will be engaged and the Ac low pressure line under the hood will bw cold. If this is all ok then a blend door issue should be suspected

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Usually a vac leak. I would check for a leak in the HVAC control system and the line thru the firewall to the engine.

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Why is my jeep stuck on defrost?


you have to check vacuum canister and vacuum lines. when a vacum line is cracked or canister has a crack you cant control air directing doors in hvac system, becasue engine creates vacuum and this canister is connected to vacuum lines and you can only control hvac system when vacuum exist on electric panel equipped Ac systems, you do not need vacuum to control blending doors. there are electric motors.

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Heat and ac controls do not work. also rear window defrost will not operate


There are few things that has to be checked.
  • Check Engine Coolant Level
  • Inspect Heater Control Valve
  • Check Vacuum Feed
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If the blower motor is faulty it will affect both the heat and cold in the car. Also check the fuse in the blower motor fuse panel.if the fuse is faulty ,then can also be the reason.if every thing checks out OK.then its the fault in wirings of the AC system.
Thanks. you can rate this solution and show your appreciation.

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1 Answer

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Check the relevant fuses with a test-light or VOM, don't just "eyeball" them as they often break at the very end. Then check the heater/A/C relays on the electrical panel. The heat/cool is controlled by a stepper motor which opens and closes the air "mixing box", but it won't work with a bad relay. If all of those check-out, you need a OBDII code reader to check the "engine" computer, as it controls the electrical modules. Also check the fusable links going to the electrical panel, and the cable from the battery to the panel. The cable may be corroded in-two and you'll never see it, so no juice to the panel, no juice to the heat/AC system. (I had a Dakota do that.) PS: Double check the grounds that they aren't corroded. Learned about that from a BSA Gold Star production racer.....

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3 Answers

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1 Answer

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The lower speeds are controlled by a resistor block. That's what needs to be replace. It's usually located next to the blower. It will have electrical wires connected to it. High speed bypasses the block so it alway works.
If you want to replace it then;
) Disconnect the battery negative terminal if the vehicle have air bags. Wait 2 minutes for system to discharge.
) Remove the kick block on the passenger side. )Remve the glove box ) Remove the bolts holding the blower motor resistor. Push the red lock up and press down on the click ) Pull the block out. ) Install new block and reverse steps above.

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Remove the insturment panel cover right behind the radio, remove the switch assembly look on the back right hand side there is a black plug connection (5 or 6 prong flat). this plug is and will always be a problem with jeeps. somtimes when a raido has been put in, the plug can be pushed away and there you go no heat, no fan. it could also be vibration from going down a rough trail.

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