Question about 1987 Dodge Ram 50

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4 speed blower motor the 2 lower speeds quit working the 2 higher speeds still work. whats the problem?

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Thats how they will tend to act when the switch is staring to go.

Posted on Feb 26, 2009

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Blower motor doesn't pump well even the fan switch on high


sounds like blower bearings are dried out and will eventually lock up the blower..sometimes you can spray wd40 in the blower bearings and it will work fine for a while.. also check vacuum controls to the baffle dors in the ductwork..may have some leaks there.. should hear a slight hissing if really bad..repost findings

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Blower motor does not work on hi speed


Could be your blower motor resister,here's a link to what it looks like,it's located next to blower motor,easy to remove,disconnect electrical connector,remove 2 screws,can't look at it to tell if bad.Here's where the blower motor is.

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My fan motor quit working.... then it works... and it quits... i pulled the dash and there is no power at the switch for the fan


Thats not how it works. The blower motor has power and the switch GROUNDS the cicuit through the blower resistor (lower speeds) or directly (high speed) Check for power at the blower motor BLACK/LIGHT GREEN is POWER. BROWN/YELLOW is ground. If you have power and ground but the motor doesnt work, then its bad. If you rap on it and it works for a while, its bad. If there is no power at the switch, the motor is bad.

Aug 25, 2011 | 2001 Ford F250 Super Duty Super Cab

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I have only high speed on my ac/heat switch. have replace acdelco blower motor resistor 2 times already. works for a while and quits. whatelse do I need to check etc?.


If you have replaced the blower motor resistor block twice all ready, i would be replacing the blower motor itself. When the blower motor is drawing too much current it burns out resistors for lower fan speeds in resistor block, but doesnt blow fuse for fan. Also check for leaves and stuff in fan when removing fan.

Jul 18, 2011 | 2006 Isuzu i-280

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My heater stop working suddenly on my car. It just stop working completely and all together ... Air condition and everything.... How can I troubleshoot the problem? It was working fine one minute and then...


I assume you mean that the blower motor quit running. Did you try it to see if it will run on any speed? If it won't run on high, but runs on the lower speeds, it is most likely a bad blower motor high relay. If it will not blow on any speed, it could be the blower motor fuse (In which case, you must find out why it blew or it will only happen again.) or the blower motor itself. Buick Century is known to burn the connector at the blower motor. There is a replacement connector available in the aftermarket to repair this. I personally recommend replacing the blower motor also if it is a burned connector because the blower motor is usually partially shorted internally, which is what causes the connector to get hot and burn.

Dec 18, 2010 | 1998 Buick Century

1 Answer

A/c and heater fan runs on speeds 3,4,5 but not on 1,and 2 how do i replace the switch and if so how do i get to it? is the switch really the problem?


Sounds like a blower motor resistor and not the switch. The resistor is mounted near the blower motor. the resistor has four resistors in it that drop the voltage to control the blower speed. It sounds like the resistor for speed 2 has burned out. This resistor is used by speed two and by speed one. If it burns out speed one will not work also. Since the higher speeds do not need the speed 2 resistor they continue to work.

Oct 04, 2010 | 2002 Chevrolet Silverado 1500

1 Answer

2000 Buick Century. Blower quit working for


I had the same problem. It turned out to be the ignition switch. i have no idea how that is connected to the fan but... it worked, got me my fan speeds back, although it is not working again...

Jul 16, 2010 | 2000 Buick Century

1 Answer

Blower motor has quite what is the probable reason 2005 Hyundai Sonata; the blower motor quit for no obvious reason. wehn I went to lunc it was working fine when I started the car to return to work it was...


probley one of five possiabes problems

1. blower motor is bad (if case alot times will take resistor or relay out with it)

2. blower resistor (conrols fan speeds usally one speed will go out first example still have high speed but now low)

3. relay (may be one or up to three) (if more than one usally wont have the resistor stated above)

4. fuses

5. blower switch

Jun 12, 2010 | 2000 Hyundai Sonata

2 Answers

My fan has the 2 highest gears of the blower working but the 2 lower gears are out. i have replaced the switch and the fan motor and i have checked the fuses and nothing is working. any ideas on what it is


Its the relay for the motor. When the relays go the high speeds will operate but the low speeds will not. Should not be too expensive and is easy to replace, only hard part is that sometimes they put them in places that are hard to acess.

Jan 09, 2010 | 1991 Toyota Pickup

2 Answers

Heayer doesn't work


The resistors provide resistance in the circuit, dropping voltage to the blower motor to slow the motor speed down. On high, the blower receives full voltage through the blower relay.

If you had High but no other speeds, then the resistor pack is usually the culprit. If you have all other speeds but high, the most common problem is going to be the blower motor itself, relay, or the switch panel.

You can check this by turning the fan speed to "high", unplug the blower motor, and check to see that you have roughly at least 12v at the plug. If you have 12v, that means the switch panel is activating the relay and the relay is working. Over time, heat kills the magnetic properties of the magnets inside an electrical motor. Without enough magnetic energy, you may not get enough opposing force to spin the rotor full speed when the windings energize, but still enough to spin at lower speeds.

Another thing you can check is the connector at the blower motor and the switch panel. Sometimes these will heat up, start to deform, and cause a bad connection. The bad connection may be able to handle the lower current draw on low speeds, but the higher resistance from the bad connection won't be able to handle the higher current while in the full speed position.

Hope this helps, keep me posted. be glad to help you get your heater working again soon.

Jan 07, 2010 | 1995 Chevrolet Tahoe

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