Question about 2004 GMC Sierra 1500 Crew Cab

2 Answers

Ac fan switch only works on high.How do you replace the switch

Posted by on

2 Answers

  • Level 1:

    An expert who has achieved level 1.

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

    Champion:

    An expert who has answered 200 questions.

  • Contributor
  • 264 Answers

HI this probably isn't the switch its the blower motor resistor. The resistor is located in the heater box by the blower motor. You will need to remove the lower trim from under the passenger side dash. Unplug the electrical connectors from the resistor and then you will remove two screws holing it the can be either 8mm or 5.5mm I have run into both. just pull down and towards you to remove the resistor it may stick at first dur to the gasket material. Good luck

Posted on Aug 28, 2010

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Master
  • 395 Answers

It sounds more like the Motor Speed Resistor that is switched into the circuit for the lower fan speeds is the fault because the resistors are bypassed when high speed is selected. The resistor is a small unit that is located in the output air ducting adjacent to the blower motor. It will have a push on connector with about 4 wires going to it. To acces the resistor remove the connector & undo the screws holding the resistor pack in the duct. The resistor pack should have 3 wire coils of varying sizes attached to the little turrets on the pack. They may be chocked up with dust or leaves that has caused them to overheat & burn out as they can get quite hot even during normal operation.

Posted on Aug 28, 2010

  • Bill Ingham May 05, 2011

    I don't think so. totally false about the resistor. take out the fan and check it its really easy.

×

2 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

leetamara
  • 702 Answers

SOURCE: 4 speed blower (fan)

You'll have to go to the dealer and buy a new switch panel. There is a circuit board behind the switch panel that went bad on yours. Don't get one from the wrecking yard, I made that mistake once.

Posted on Aug 11, 2008

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

How long for the ac fan to start working? Ive noticed that the fan does not work when i turn the ac on, can this cause my car to overheat. I check the temp and coolant liquid both seems fine.


the ac fan starts as soon as the ac is switched on
the fan is provide cooling of the condenser before the radiator to prevent high head pressures in the ac compressor
it is the fan at the front of the car mand does not affect engine temp
there is a radiator fan between the engine and the radiator that will not start until the coolant temperature reaches a set temp at which point the ECM switches that fan on
if that fan is not working when the engine is hot , check for fan, coolant temperature sensor switch , fan relay, fuses or problem ECM

Jan 13, 2016 | AC Cars & Trucks

1 Answer

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

Jun 05, 2014 | 1999 Volkswagen Jetta

1 Answer

Location of ac high pressure cutout switch on a 97 Plymouth voyager. Could it be a different problem? Had to replaced the PCM and a couple sensors because of a short in the wiring cluster. Now the ac...


HIGH PRESSURE CUTOFF SWITCH LOCATED ON AC COMPRESSOR DISCHARGE LINE LEADING TO THE CONDENSOR.THE HIGH PRESSURE CUTOFF SWITCH WILL CUT OFF THE AC COMPRESSOR IF SYSTEM PRESSURE RISES TO HIGH CAUSED BY RESTRICTION IN THE REFRIGERANT CIRCUIT OR OVERHEATED CONDENSOR.MAKE SURE COOLING FAN IS RUNNING WHEN THE AC SWITCH IS ON.THE COOLING FAN KEEP CONDENSOR COOL, IF COOLING FAN DONT RUN.YOUR AC WILL STOP BLOWING COLD AIR.HAVE THE REFRIGERANT SYSTEM CHECK OUT.MAKE SURE YOUR LOW SIDE PRESSURE IS 10 - 37 PSI. THE HIGH SIDE PRESSURE SHOULD BE 112 - 210 PSI. CHECK THE AC COMPRESSOR CLUTCH FUSE AND RELAY.

Jul 29, 2011 | Plymouth Voyager Cars & Trucks

1 Answer

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.


I have the same problem on my 1999 Jetta have you gotten any responces yet if you do please email me the solution rohintz@gmail.com Thank you Rick

Jun 13, 2011 | 1999 Volkswagen Jetta

2 Answers

Ac fan motor doesnt work on low speeds only on


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

Jul 26, 2010 | 2006 Isuzu i-280

1 Answer

Jump air compressor ac works replace relays same issue HONDA


the compressor may be low on freopn but, the fan problem is most likely the fan motor as it is the low temp fan and will run more often than both fans...to test see if you can switch the fan plugin to the other fan watch carefully that it does not get too hot as the second fan is a safety fan that works as high temp or when using the A\C

Jul 13, 2010 | 1997 Honda Accord

1 Answer

I have a 1994 es 300 and my car keeps running hot when the AC is on. It only runs hot when im in town, when im on the highway or in the country it doesnt. my dad replace everything just about! and it still...


turn on ac and see if fans come on ,,see if fans or fan kicks into high after a little while ,look for reason why fans or fans do not run with ac on they have to run ,relay? or high side switch check preasures on ac ,low side and high,high side may be to high for fans or fan to cool down ,,ac problem or to much freon,,,radiator new?

Jul 03, 2009 | 1995 Lexus ES 300

1 Answer

My cooling fans don't turn on at all. i tested fans and they work and also replaced relay. what could be causing for fans not to turn on?


do they turn on with ac ?if not look for ac fan relays and check and high side ac switch in line ,if fans dont turn on for just the engine general cooling ,without ac on then check coolant temp sensor/replace it to see if it fixes it PASS THIS SWITCH IT WILL SHORT OUT COMPUTER IF U DO

Jun 30, 2009 | 2001 Pontiac Grand Am SE

1 Answer

Fan switch only works on high


Hi! Look on the heater housing, you will find a terminal with a plug. Remove the plug, then the 2 screws, pull the unit out and replace it! Everything will work perfect! Frankster016

Nov 22, 2008 | 1999 Ford Contour

Not finding what you are looking for?
Cars & Trucks Logo

384 people viewed this question

Ask a Question

Usually answered in minutes!

Top GMC Experts

yadayada
yadayada

Level 3 Expert

75197 Answers

Freddy

Level 3 Expert

1311 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22095 Answers

Are you a GMC Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...