Question about 1990 Jeep Cherokee Limited

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Blower motor works but evenually blows fuse

Checked the switch, seems good, checked resistor, starts with 9 ohms/low-100 ohms/high, then after been run a while goes to infinite, is this right?

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  • artismo Nov 13, 2008

    it's possible the brushes are worn,but the fuse blows for no apparent reason, so maybe there's an intermittent short or something's heating up-like the resistor? plus the blower runs really strong

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Worn brush's or bushings inside blower motor. remove motor,open it up and inspect it, rebuild or replace.

Posted on Nov 12, 2008

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Posted on Jan 02, 2017

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What is an AC diode fuse? I have a 2006 AWD Pontiac Torrent the AC/Heat doesn't work, I've changed all fuses for the HAVAC and still no AC/Heat blowing out of vents. What could be the problem?


Could be a number of thing's ! Testing the electrical circuit is the way to find out what's wrong . Using a wiring diagram and a DVOM - digital volt ohm meter . Videos on youtube showing how to test it ! Without testing i would only be guessing . Does it work in high speed ? In high speed it by-passes the resistor . If it doesn't work in any speed more then likely the blower motor is the problem !
Air Speed
The HVAC control assembly applies ground to the blower motor control circuit that corresponds to the selected blower speed. The resistors and the blower motor are in a series circuit. The following list represents the number of resistors in series with the blower motor per particular speed request:
• Low speed--3 resistors
• Medium 1 speed--2 resistors
• Medium 2 speed--1 resistor
When the operator requests High speed, the HVAC control assembly applies ground directly to the blower motor through the high blower motor control circuit. The resistor card has a fusible link which, if blown, will require that the card be replaced.

Blower Motor and Resistor Diagnostics by Wells

Jun 11, 2017 | Pontiac Cars & Trucks

2 Answers

Replaced the resister and blower motor still nothing what next


Test for current to motor. If none you have either a bad fuse, bad switch or bad wiring. Nothing else left.

Feb 26, 2015 | Cars & Trucks

1 Answer

Blower motor in front doesn't work on any speed but rear works good


9 Volts would only get you medium fan... if it did work.

Lets get down to basics. Did you actually test the ground? with a test light or OHM meter? There should be less than 3 OHMs of resistance between the ground wire and the battery.

Did you test the voltage output to the vehicles battery?? ( 9 volts on high is way to low, especially if the vehicle was running.)

You don't need a wring schematic if your willing to work for it.
http://larry.wvnet.edu/~van/pics/1994EFan.jpg


But in my Professional Opinion it sounds like the Blower Resistor pack is going bad, or you have a bad ground.

On those the resistor pack is on the ground side of the fan, so you have to check the ground after it, not through it. Witch also means if the ground is OK you have to check the switch, but you kinda did that already, kinda.

Also check the voltage at the relay to the battery, you should have battery voltage at both sides of it to the battery when it is turned on (relays do go bad to)

In my 21 year career, electrical Diagnosis has always been the most challenging............. Good thing I'm up to a challenge :)

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Air conditioner/heater/vent will not blow air or turn on


Check for full battery voltage at the resistor block, it should have it any time the engine is on, If you don't have voltage to any of the connectors, there is usually a blower motor relay that needs to be checked if all fuses checked out as good.
If it DOES have voltage to the resistor, put the blower speed to full high and check for voltage to the blower motor, if none, then there is a circuit failure, if there is voltage, check the ground side of the blower with an ohm meter, it should read near zero ohms resistance.

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1 Answer

2010 Chrysler sebring the heater isn't working. Changed the blower motor resistor and that didn't solve the problem. Took out the blower motor and checked it and it is working. I removed the insturment...


Use the test light and check for power at the resistor- one wire there would be for high speed, which basically bypasses the resistor.
Also check for power at the blower motor with key on and blower switch on high. If you have power and you know the blower motor is good, it could be a ground problem for the blower.

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1 Answer

Heat fan only works on hi


There are only a couple of things that could cause this issue, and I would start with the simplest thing first, and that is to check your fuse panel. Your blower will operate only on high because it is wired to do so on the number 4 setting as it bypasses the blower motor resistor. If the fuses are good, then the blower motor resistor is the next step, and this can be found close to the blower motor, as the blower motor, when on, cools the resistor, when the resistor gets old and to hot, it will blow, thus causing your fan to only work on high. If the resistor is good, then the last thing that you would check is the fan selector switch. I seriously doubt that it is the switch, it is usually the fuse, or the resistor.

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1 Answer

My 2005 Jeep Grand Cherokee heater only blows air on the high setting, I ohm tested the HVAC fuse under the hood and only get response on 1 leg.


when the blower motor resistor fails the blower switch defaults to the high position. autozone.com has a great tutorial on how to replace the blower motor resistor.

realfixesrealfast.com has a segment on blower motor resistors.

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There is a blower motor relay,near the motor i think,check it.

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1 Answer

Speed fun control airconditioned doesn´t work property.


Two possible areas I would check using an ohm meter. First is the blower resistor which is usually located by the blower motor and looks like a cement rectangle or a ceramic tube with wires attached to it. The resistor should have very low resistance but should not read open from the common lead to the other terminals. If it tests good test the continuity of the fan switch. Some cars have a fuse for the high and low blower speeds so you can check your fuse diagram and look for two blower or fan fuses. Good Luck.

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