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Air Conditioning Control Problem

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Old Jul 28, 2009 | 04:27 PM
  #1  
casslaw's Avatar
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From: Wesley Chapel Florida
Default Air Conditioning Control Problem

On my 99 frc, the a/c never worked on 1,,,every other fan setting worked, so it didn't bother me much. Today, 2 went out, so my a/c is only working from 3 and up. Any ideas to what's wrong? I don't have dual zone, and my first thought was the switch, but someone else said it has to be the fan motor resistor so I am checking with you guys. Thanks.
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Old Jul 28, 2009 | 05:39 PM
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From: Kinston North Carolina
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Could be either, Switch, Resistor, or wiring. Resistors most likely!
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Old Jul 29, 2009 | 12:33 AM
  #3  
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From: Bucks County Pa
Default Fan not working

Originally Posted by byronhunter
Could be either, Switch, Resistor, or wiring. Resistors most likely!
Hi, the problem is quite common on many cars after many miles. It is the "Blower Control Module". The resistance coils get brittle and break. You can see it on byronhunters wiring diagram in the right side near the top. Replace the Module and all will be well. See Below.
Good Luck
++++++++++++++++++++++++++++++++
Blower Motor Resistor Replacement
Removal Procedure




Remove the front floor kick-up panel. Refer to Kick-Up Panel Replacement - Front Floor in Interior Trim.
Remove the cover from the IP electrical center.
Remove the BLO MOT (blower motor) MaxiFuse® #49 from the IP electrical center.
Remove the RH lower IP insulator panel. Refer to Closeout/Insulator Panel Replacement - Instrument Panel (I/P) Lower in Instrument Panel, Gauges and Console.
Disconnect the wiring harness electrical connector from the blower motor resistor.



Disconnect the blower motor resistor electrical connector from the blower motor.



LOOSEN the blower motor resistor forward retaining screws (nearest the dash mat) approximately 5 mm (0.197 in). (The resistor is slotted at the forward retaining locations.)
Remove the resistor rear retaining screw.
Tilt down the rear of the resistor; use care to not damage the portion of the resistor which fits up into the HVAC module.
Remove the blower motor resistor from the vehicle.
Inspect the condition of the blower motor resistor seal. Replace if necessary.
Installation Procedure




Position the blower motor resistor forward retaining slots onto the forward retaining screws and the upper portion of the resistor into the HVAC module.
Align and seat the resistor to the HVAC module.
Install the resistor rear retaining screw and drive until just secure.

Notice
Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.


Tighten all the resistor retaining screws. Tighten
Tighten the blower motor resistor retaining screws to 1.6 N·m (14 lb in).





Connect the blower motor resistor electrical connector to the blower motor.



Connect the wiring harness electrical connector to the blower motor resistor.
Install the RH lower IP insulator panel. Refer to Closeout/Insulator Panel Replacement - Instrument Panel (I/P) Lower in Instrument Panel, Gauges and Console.
Install the BLO MOT (blower motor) MaxiFuse® #49 to the IP electrical center.
Install the cover to the IP electrical center.
Install the front floor kick-up panel. Refer to Kick-Up Panel Replacement - Front Floor in Interior Trim.

Last edited by bestvettever; Jul 29, 2009 at 12:38 AM.
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Old Jul 29, 2009 | 09:11 AM
  #4  
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casslaw
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From: Wesley Chapel Florida
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Well I bought the 26 dollar resistor and thanks to these two incredibly detailed responses, I'm thinking my a/c will be good to go again very soon. Thanks guys
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