Question about 2005 Chevrolet Silverado 2500HD 2WD

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Do i have a bad HVAC Fan Switch?

No fan function. Voltage tested with Fluke meter with key on and fuses checked. Regardless of switch position (5 position), "No voltage" getting to any lead at connector at fan module. At Fan switch, only (Black) has 12V. No other lead hot regardless of switch position. Bad switch?

Posted by Wade Opper on

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5 Related Answers

Anonymous

  • 94 Answers

SOURCE: 2000 CHEVY BLAZER NO HVAC( RE-POST w/MORE DETAIL)

replace the control unit this should solve your problem

Posted on Mar 08, 2009

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co7196

Ned C Cook

  • 3433 Answers

SOURCE: the amp meter shows no voltage but measuring the

An ameter won't show voltage.

Posted on Jul 20, 2009

Testimonial: "thanks "

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Anonymous

  • 2 Answers

SOURCE: 2004 Impala rear window defroster not working

the 30 amp breaker is behind the fuses ....u have to take the glovecompartment out and pull the whole fusebox out if ur hands r too big ....the power seat circuit breaker is there 2
nab

Posted on Jan 07, 2010

micronaut1

  • 114 Answers

SOURCE: 5 speed fan on h&a #5 quit 1st and now all

There is a voltage regulator somewhere in that circuit. it controls the speed of the motor by changing the voltage in the circuit. Trace the wire back from the motor and you will find it, it's between the switch and the motor. They sometimes get hot and stop working on certain speeds. Change it out with a new one and check the amperage on the circuit to make sure you won't cook your new one. Good luck.

Posted on Apr 18, 2010

csmock132

Clint Smock

  • 4669 Answers

SOURCE: Problem with a 2000 cavalier Z24 with center

Yes it switches the polarity

Posted on Jun 11, 2010

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1 Answer

Blower not working


Tell us what make an model of vehicle you are using in your description of the problem. Blower not working can be caused by:
1. Blown fuse
2. Bad fan switch
3. Bad resistor speed selector unit (changes voltage going to fan motor.
4. Melted or bad connector, usually between switch and motor.
5. You have lost the ground from the fan going back to the battery. ie, a bad connection.
You will need a volt/ohm meter after you check the fuse.
Make sure you have battery voltage (about 12 volts) coming to the fan switch. If you do get 12 volts, follow it in the circuit going to the blower fan until you stop getting 12 volts. Where it stops is where the problem is. You can also start the test right at the blower fan with a meter to see if the fan is getting 12 volts and work backwards towards the switch.
Most likely cause: Bad resistor pack or connectors melted going to it, followed by a bad fan switch.
Good luck!

Oct 02, 2018 | Cars & Trucks

2 Answers

Dawoo laganza 2009 heater fan swith not operational tried all fuses etc


Check for battery voltage at the switch, if none check for blown fuse or broken cable,if OK check voltage at fan, If none check for faulty cable or bad connection, if ok replace fan.

Dec 03, 2017 | Cars & Trucks

1 Answer

The fan that blows hot air/cold air all of a sudden wont turn on when you hit the switch..the 30 amp. Fuse is good. How do I rule out whether its the switch or the fan motor.


Check for voltage and ground at the fan connector, with hvac turned on. If good voltage and ground with no fan action, suspect the fan. Use a testlite. Did you check for voltage at the applicable fuse circuit? Even if the fuse is good, if no voltage, the circuit is still dead.

Dec 13, 2015 | 1990 Ford Tempo

1 Answer

Rear wiper stopped


Do you know how to use a volt meter ? Need to check for voltage at the motor ! , need a wiring diagram. Most of the time other people on here will tell you to check the fuse's , that doesn't end up being the cause ! Most of the time it's the motor or a wiring problem ! I have seen the wire in side the rubber boot ,when you open the rear hatch break causing a no power situation to the motor . If you open the rear hatch ,door ,lift gate , what ever you call it . If you look when it is open there is a rubber boot connecting the body to the door , there are wires in side . There have been known to break ! This next part is a FORD pinpoint test. This is how ford says how to check !
PINPOINT TEST B: THE WIPERS ARE INOPERATIVE - REAR WINDOW Test Step Result / Action to Take B1 CHECK CIRCUITS CBP43 (GY) AND SBP19 (BU/RD) FOR VOLTAGE
  • Key in OFF position.
  • Disconnect: Rear Wiper Motor C476.
  • Key in ON position.
  • Measure the voltage between rear wiper motor C476-3, circuit CBP43 (GY), harness side and ground; and between rear wiper motor C476-4, circuit SBP19 (BU/RD), harness side and ground.
    >
  • Are the voltages greater than 10 volts?
Yes
GO to B2 .

No
VERIFY SJB fuse 43 (5A) and fuse 19 (25A) are OK. If OK, REPAIR the circuit(s) in question. TEST the system for normal operation. B2 CHECK CIRCUIT GD150 (BK/WH) FOR OPEN
  • Key in OFF position.
  • Measure the resistance between rear wiper C476-1, circuit GD150 (BK/WH), harness side and ground.
    >
  • Is the resistance less than 5 ohms?
Yes
GO to B3 .

No
REPAIR the circuit(s) in question. TEST the system for normal operation. B3 CHECK THE MULTI-FUNCTION SWITCH
  • Key in OFF position.
  • Disconnect: Multi-function Switch C202.
  • Carry out the multi-function switch component test. Refer to Wiring Diagrams Cell 149 for schematic and connector information.
  • Did the multi-function switch pass the component test?
Yes
GO to B4 .

No
INSTALL a new multi-function switch. REFER to Section 211-05 .

Mar 14, 2015 | 2010 Ford Expedition EL

2 Answers

How to check fan blower switch I need diagram of the switch


id find blower motor and hit it with a hammer if it turn on its bad also look at the wire to the resistor they melt down if its bad put new connector and resistor in iv done a few

Mar 04, 2015 | 2005 Chevrolet Silverado

1 Answer

Have replaced compressor, drier, blower switch, blower motor, blower resistor, blower relay, direct +12 volts to dash controls. but blower motor inop. Any advice would be appreciated.


Have you replaced the fan switch? Or if you have a voltage meter you can check for voltage at the motor, and at the switch then in between where you can to isolate the short if there is one. Also since you mention running a separate 12 positive wire into the controls be sure that you connected it correctly. Also check and see if you have voltage at the wire you added. If you have voltage at the wire you added, then you need to check if the switch is letting power through it. So use your volt meter to test for voltage, check all the fan speeds also. I'm guessing you had problems with this before and that is why you have ran your own wire. So you probably kept blowing the fan fuse, this would most likely be from a bad switch, a short, or a bare wire.

Jun 17, 2011 | Oldsmobile Cutlass Supreme Cars & Trucks

1 Answer

I have a 2000 Pontiac Grand Prix GT. The blower motor only works in the High position. I replaced the blower motor resistor, but it didn't help. Shot the wires with a meter and get 11.8vdc through...


I would check all fuses associated with the HVAC, if all fuses are good and you are sure the new part you bought is good then the problem would be in the control unit.

May 29, 2011 | 2000 Pontiac Grand Prix

1 Answer

Recirclation light blinks on and off and will not stay on anf fan does not blow at full force when it's switch to level 5.


{: ) Regardless of the blower motor switch position, recirculation is available only in the panel and bi-level mode switch positions. Including the OFF position. The mode switch must be placed in either the panel or bi-level position before the blower motor switch is placed in the OFF position. In order to reduce windshield fogging, outside air is circulated when the mode switch is in the defrost or defog positions. If the recirculation switch is pressed into the ON position when the mode switch is in an unavailable mode position, then the recirculation switch LED will flash 3 times. If the HVAC control module detects a fault with the recirc door the HVAC control module will try to drive the actuator for a predetermined amount of time, to outside air, which is the defaulted position for the recirculation actuator.
As for your blower not full force at level 5, check first the BLWR fuse 40A at the underhood fuse block. If its okay, most likely you have a malfunctioning blower motor resistor assembly.

Jul 06, 2010 | 2006 Chevrolet Trailblazer

1 Answer

Fan only works on 4 and 5 settings? Is this a


Hello,

I have a 2003 Chevy Cavalier. The HVAC airflow dial only works on high setting. We checked the fuse and it's o.k.

What now?  Any estimate as to repair cost? 

Thank you

Sep 07, 2009 | Chevrolet Malibu Cars & Trucks

1 Answer

Blower fan only works on high


CHECK THE HVAC CTRL FUSE.

WITH A TEST LIGHT CHECK THE BLOWER RESISTOR FOR POWER ON THE YELLOW, TAN, PURPLE, AND LIGHT BLUE WIRES. THE ORANGE WIRES CONTROL THE HIGH SPEED CIRCUIT. DO THIS FOR EACH POSITION OF THE BLOWER SWITCH.

THE BROWN WIRE ON THE HVAC CONTROL CONNECTOR 1 POSITION B COMES FROM THE HVAC FUSE 20 AMP. NO POWER ON THAT WIRE WILL CAUSE THE BLOWER TO NOT FUNCTION ON THE LOWER SPEEDS.

Jul 14, 2009 | 2000 Pontiac Grand Prix

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