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I just replaced the ac blower motor the fan runs but when i turn the speed control to high the fan runs at low speed and wjen i turn it to loe it runs on high speed what will cause this

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Posted on Jan 02, 2017

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SOURCE: heat-a/c blower motor stopped

check for ground going to fan. If there is no ground replace a/c control panel located under radio it what you use to turn on the heater/ a/c

Posted on Aug 27, 2008

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SOURCE: 2000 cherokee sport blower motor control

It is a bad blower motor resistor and it is mounted on the bottom of the A/C heater housing on the passenger side of the vehicle under the glovebox area. Hope this helps. Please rate this a fixya if it helps. Thanks.

Mike

Posted on Sep 13, 2008

  • 1 Answer

SOURCE: Climate Control Blower motor stopped working

I had the same problem with my 2000 Mercury Grand Marquis. I ended up replacing the blower and the resistor which is on the passenger center side of the firewall tucked in where it is hard to get to. Everything worked fine for about two years. It just went out again here about a month ago. I am going to try to replace the resistor again, but I am wondering if it doesnt have something to do with the climate control switch. I do not want to replace the same part every year or two, so if anyone has a idea of what could possibaly be the bigger problem, please let me know.

Posted on Nov 22, 2008

csmock132
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SOURCE: Heater/AC blower will not operate

Replace the blower resistor.

Posted on Mar 03, 2009

  • 1 Answer

SOURCE: ac fan won't turn off

In my 2001 Town and Country without automatic temperature control, my heater/AC blower suddenly worked only when set on high. Usually, that problem is your blower resistor pack.

I had to search for the one in my van since the parts man wasn’t sure where it was except that he thought it was in the dash somewhere. (In some other vans it was under the hood.) My Haynes manual didn’t have anything on it except a picture showing it with the blower. I found it directly behind the glove compartment. Very easy to get to once you know where it is.

The glove box can be lowered all the way out of the way just by pulling in the sides so the rubber stoppers come out toward you. The sides bend easily to allow that.

The glove box being out reveals the resistor in the heating duct right in front of you. Just remove the two sets of wires and two bolts (10mm socket, I think) and the resistor pack slides right out. Then bolt in the new one an plug the wires back in (they only fit in one way). Fold the glove box back up and press the stops in to get them back in place and you are done.

The resistor pack only cost $12 and change at my dealer. It is part number 1-04885583AB which was a replacement for the same number with AA at the end, so I’m guessing they had a lot of trouble with the AAs and so made a better AB.

Last Winter my heater blower fan worked only on High. I changed the front heater/AC blower resistor pack and was surprised at how easy it is, but I had to figure it out for myself since my Dealer's parts guy was no help as to where the part lived and my Haynes manual was just plain wrong. This was on a 2001 T+C. I'd be very surprised if the 2001 Caravan was any different. Don't know what other year vans would be the same. I do know some earlier generations had this resistor under the hood and Haynes had is with the blower sort of behind the instrument cluster.

Posted on Sep 16, 2009

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2003 jETTA Fan only works high speed. For AC compressor runs but no fan other than when switched to high speed at which time the fan runs at high speed but AC switches off.


a resistor went bad for your blower motor.It is located by the blower motor on a circuit board.You can get the replacement resistor at Radio Shack and solder it in.This fixed my problem

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Yes,could be your blower resistor is bad,it's right next to the blower motor,it controls the blower motor speed,easy to replace. Duralast Blower Motor Resistor Just took a guess at the model type since you didn't state,wow,high dollar price,guess it comes with a Mercedes,paid about 18 bucks for mine on my 85 Nissan.

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Not sure I follow your question. If the blower motor runs at high speed on all fan settings, there could be a short in the controller. The fan control and ac-heat control are separate circuits in the controller.

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1992 chevy C1500: Heat works on low speed, no medium, and high only works intermittantly.


On any other vehicle it sounds like the blower fan switch.
The fan switch provides power or ground to the resistor and there would be a high speed blower relay to bypass the resistor.
But in your case the fan switch is part of the controller.
I don't have a diagram for a 92 but the 94 model shows relays for low medium and high speeds. Each relay gets power from a fuseable link. The high relay gets power thru the low relay if the low relay is not engaged.
If you have the model with 3 relays you may need to check them.

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01 grand.prix ac fan switch only works on high. has a duel temp controller when you turn fan off the only way fan comes back on is to move the temp controller levers


Hi!!
When the Blower Motor Resistor (controls blower speeds) goes bad, the blower motor works only on HIGH SPEED. REPLACE IT.
BLOWER MOTOR RESISTOR Removal & Installation
  • Disconnect negative battery cable.
  • Remove right lower instrument panel insulator panel.
  • Disconnect blower resistor connector located behind right side of dash.
  • Remove blower resistor screws and blower resistor.
To install, reverse removal procedure
Good Luck!! A HELPFUL - 4 THUMBS - rating for this solution would be greatly appreciated. Thank you for using FixYa!!

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Good Evening, If I am translating this properly your fan only works on the high setting? And the other settings do not change the speed? If this is correct respond back and I will help as much as possible.

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If you have manual air conditioning replace the high blower relay
If automatic climate control Air replace the blower module

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I will assume the heater fan also doesn't work on low. You will need to replace the fan speed selector switch

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When the light is blinking that means there is a code in the system you will have to take it to a shop and have the codes read. Sometimes "Jiffy Lube" or "Rapid Oil Change" can read the code for but they won't fix it. If the blower motor only runs on high, the blower motor resistor is bad. When you put the fan switch on high it puts full voltage to the fan motor (blower motor) when the fan switch is in any other position, the voltage is reduced by the resistor causing the motor to run at slower speeds. The two problems are probably a result of the resistor.

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