Question about 1992 Jeep Cherokee Sport

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WHEN YOU TURN THE A/C OR HEATER ON THE FAN WILL NOT WORK ON LOW MED HI CHECKED FUESE AND IT GOOD

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Fan control switch is probably bad

Posted on Oct 07, 2010

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1 Answer

Cab fan doesn't work? 1998 Buick Labsaber


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ok under the hood were the blower motor is, or under the dash were over it may be there is a resistor there has 2 screws holding it in pace with a plug should have 4 or 5 wires on it with a test light or mult meter test for power there if you have power at the red wire the other 3 wires one is your low speed the other is med speed the 3rd id hi speed test them for power, you will need to turn your speed switch from low to med then hi to see volts there if you have power at one and not the others unplug it and put a jumper wire in there and you fan should work on what ever speed wire you have it in and if it work on all 3 speed by installing a jumper you will need to replace the resistor there a round 20 bucks .....

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Ac/heater will only work on low when you move it to med or high it shuts off


need to check switch,resistor and fan ---ur switch might have resistor built in it would need to be tested for continuity for the other speeds --if your truck [didnt specify which ] has a separate resistor it should be attached to the heater fan motor housing again resistor needs to be tested -also test ur fan for any resistance or overheating

Apr 10, 2014 | 1993 Toyota Pickup

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The heater fan only works on high


Item that need to replace is the blower resistor.

It is on the firewall side.

Jan 11, 2014 | 2001 Chevrolet Astro

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Hi,
Don't go there just yet ! Most heater motor speed problems relate to the heater resistor ! It's located in the ducting close to the motor assy and usually has 4/5 wires on to it and a 2 screw fixing. This componant must be cooled (hence air duct location) and is solely responsible for motor speeds ! You can check motor fan by test lamp/meter ! Good Luck

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Rear AC fan will not run in lo med or hi, switch or is there resistors on the fan that need checked?


When a blower motor does not turn on in low or med. and only turns on high its usally a resistor block. If nothing works it is most likely the bolwer motor itself or a fuse.

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1998 Ford Ranger super cab heater fan problem


Check the resistor block. It is located under the hood on the passenger side firewall under the fan motor. It has two small screws holding it in place with a wiring plug attached. Clean out corrosion to restore good electrical connections. If cleaning does not restore operation a new resistor block will be required. Weatherproof the outside of the wiring plug to prevent further corrosion and reassemble.

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1 Answer

Heater blower works intermitantly


If you have access to a DC voltmeter; try this:
Check for voltage on each of the heater resistor terminals, when it is unplugged, key in the on position. With the heater switch on low, you should have 3 volts DC, on lo-med, 6 VDC, hi-med, 9 VDC and on hi, 12 vdc. It looks to me like you might have a bad heater switrch, if the voltages do not match exactly what is posted above, or vary when you slightly manipulate the switch, the switch contacts are bad. Hope this helps. If not, please repost for additinal info.

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