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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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 :)

May 27, 2014 | 2004 Ford Expedition

2 Answers

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.

Apr 21, 2013 | Cars & Trucks

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.

Mar 22, 2011 | 1998 Ford F150 Regular Cab

2 Answers

Heater motor does not blow


I suggest that you start by checking the fuse labeled HVAC 30A in the engine compartment fuse box. If the fuse is good, then check the blower relay for functionality by listening for a click while an assistant switches the blower on and off. The relay should be in the engine compartment fuse/relay box. If the relay appears to be working then check the blower motor resistor unit. Using an ohmmeter test the resistance between the DK BLU wire terminal C, and the LT BLU wire terminal A the reading should be around .26 ohms. Between the LT BLU wire terminal A, and the TAN wire terminal C the reading should be 2.1 ohms. And between the BRN wire terminal B, and the TAN wire terminal C the reading should be .71 ohms. If the readings are significantly different then replace the resistor unit. The attached drawings show the possible locations of the resistor assembly. If all of these things check out then either the control switch, or wiring are faulty, or the blower motor is bad.

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Feb 11, 2011 | 1999 Chevrolet S-10 Pickup

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.

Nov 13, 2010 | 2005 Jeep Grand Cherokee

2 Answers

Heater bower won't blow


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

Apr 12, 2010 | 1998 Ford Contour

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.

Apr 02, 2010 | 2002 Chrysler Sebring

1 Answer

Blower motor not working on 94 buick lesebre


is the blower motor resistor good? will it blow on high? if so i sespect resistor

May 05, 2009 | 1994 Buick LeSabre

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