Question about 2001 Jeep Grand Cherokee

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2001 JGCL heater blower motor works intermittently If you wiggle wire on blower control unit it works. I replaced wiring with new Mopar wire set. Now, it does not work at all.

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Check control unit for any burning or melting at contacts for wire harness. If damaged, change it. Also, you may have a problem with the blower motor causing excessive draw. This will cause switch /wiring to overheat. Make sure that wires do not get hot before stuffing everything back into dash.

Posted on Mar 07, 2009

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Hi Roody, Im glad to help!

Usually when a blower motor is working one moment and not the next the "Blower Resister" is trying to go bad, make sure you also check the connector to see if its burn't, if it is you can get a jump wire from Chrysler. The other thing I have seen is the "Connector" at the blower motor can burn up if there's to much resistance in the motor itself or a loose connection. If that the case, you'll need the motor and wiring. I've also seen where the control head is defective inside. HERE"S HOW YOU CHECK IT: The next time the blower quits working grab the blower speed knob and wiggle it, if the blower starts working again then you'll need a new control head. Hope this helps and have an awesome day Roody.

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This is a common failure on 1999-2004 WJ models with the AZC (Automatic Zone Control) system. The connector on the blower motor control module overheats, resulting in intermittent or no operation of the blower motor. Mopar released a connector harness repair kit to fix the problem. The damaged connector is cut off and new wires are spliced into place. Only the green wires from the kit are used. One end of each of the 3 green wires goes into the new connector end that is provided. When inserting the wires into the connector, the locking spring tabs should be on the bottom. There is a gray plastic retainer that is then installed around the three wires that were just inserted into the connector.

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When you have located the blower now look to the side on the heater box, there you will see a connector plug, it plugs into a connection on the heater box, this will be the resistor, the resistor slides into heater box and the end of it bolts to box to hold it in place and then the connector plugs into it, if you can not locate it then follow wires that plug into blower , follow wires back they will lead you to resistor,
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You replaced the resistor and WHAT relay? The blower motor circuit on a 2007 Dodge Nitro does not use a relay.

The blower resistor gets it's power from the A/C - heater control unit.

If you check for voltage at the blower motor resistor connector (Key on, relay disconnected), the DARK BLUE/GREY wire should be hot when the control switch is on HIGH. The DARK BLUE/VIOLET wire should be hot with the switch in the MEDIUM 2 position.The DARK BLUE/ORANGE wire should be hot with the switch in the MEDIUM 1 position. The DARK BLUE/BROWN wire should be hot with the switch on LOW.

If any of these are not as stated above, then you either have a bad A/C - heater control unit, or faulty wiring between the control unit and the resistor.

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Hi vith92633, I'm glad to help!

Normally blower motors do not go out after replacing them. The problem usually is wiring or connector issues. Try wiggling the wiring connector at the blower motor, if it comes on and goes off while wiggling it then replace the connector and wiring. If it does nothing when you wiggle the connector, then go to the "Blower Resister" and wiggle the connector the same way. If the motor kicks in and out then replace the "Resister and Wiring with the Connector". If neither of those are the problem then you could possibly need a A/C Control Head. Hope this helps and have an awesome day vith92633.

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That is a BSC, or blower speed controller. This is a very common concern, in most cases if you simply wiggle the harness the controller will start to work.
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when wired to the battery it's getting full power.
so if the switch is set to anything but max it won't get full power. does it work on max?
does the fan stop and start over bumps? will it come on if you wiggle the wires? check those.
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need new technician.if the blower motor works even with only one speed than the blower motor works and did not need replacement.sounds like blower motor resistor or resistor wiring,when there is a problem with the resistor or wiring you will only have one speed,this way you atleast have heat.so if your tech replaced the blower motor when it worked and did not need replacement then it sounds like he is just throwing parts at it,you have to wonder if he really checked anything.have the resistor and wiring checked and if ok then check the heater control head and wiring.

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mopar id # 1-04462841

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