Question about 2004 GMC Envoy

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The first 3 speeds of the 5 speed fan control do not work.How do I access the fan.

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I'm thinking the blower motor resistor.

Posted on Oct 02, 2009

Testimonial: "Thanks,that seems logical,now how do I access the resistor to replace it?"

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The problem is the fan switch

Posted on Sep 29, 2009

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1 Answer

2007 ford taurus condensor fan not coming on with ac


Fan Control The PCM monitors certain parameters (such as engine coolant temperature, vehicle speed, A/C on/off status, A/C pressure) to determine engine cooling fan needs.
For variable speed electric fan(s):
The PCM controls the fan speed and operation using a duty cycle output on the fan control variable (FCV) circuit. The fan controller (located at or integral to the engine cooling fan assembly) receives the FCV command and operates the cooling fan at the speed requested (by varying the power applied to the fan motor).


EDGE/MKX, FIVE HUNDRED/FREESTYLE/MONTEGO, FUSION/MILAN/MKZ, CROWN VICTORIA/GRAND MARQUIS, TOWN CAR: FCV DUTY CYCLE OUTPUT FROM PCM (negative duty cycle) FCV Duty Cycle Command (NEGATIVE (-) duty cycle) Cooling Fan Response/Speed Greater than 0 but less than 5% Fan off, controller inactive Greater than 5% but less than 10% Fan off, controller is in active/ready state Edge/MKX, Crown Victoria/Grand Marquis, Town Car:
10% - 90% Edge/MKX, Crown Victoria/Grand Marquis, Town Car:
Linear speed increase from 30% to 100% Five Hundred/Freestyle/Montego, Fusion/Milan/MKZ:
30% - 90% Five Hundred/Freestyle/Montego, Fusion/Milan/MKZ:
Linear speed increase from 50% to 100% Greater than 90% but less than 95% 100% Greater than 95% but less than 100% Fan off
For relay controlled fans:
The PCM controls the fan operation through the fan control (FC) (single speed fan applications), low fan control (LFC), medium fan control (MFC), and/or high fan control (HFC) outputs. Some applications will have the xFC circuit wired to 2 separate relays.
For 3-speed fans, although the PCM output circuits are called low, medium, and high fan control (FC), cooling fan speed is controlled by a combination of these outputs. Refer to the following table.
If you don't understand these thing's listed above your best bet is to take your vehicle to a qualified repair shop . Have the vehicle checked for DTC'S - diagnostic trouble codes !
If

Jun 14, 2016 | Ford Cars & Trucks

1 Answer

Ac fan speed control sometimes only works on position 5 ,sometimes all speeds work and sometimes will not work at all. replaced fan blower resistor today , still have same problem


The blower motor may be bad, or possibly the fan speed switch. May very well be the circuit breaker for the blower as well. The blower connector may be loose. Let me know what you find.

Aug 28, 2011 | Chevrolet Impala Cars & Trucks

1 Answer

2003 Chev Malibu.V6, loaded: HVAC: control head


under the dash on the right side ,look for a plug with 5 wires . That switch is called a RHEOSTAT.(fan speed control).Sounds like it is defective

Apr 05, 2010 | 2003 Chevrolet Malibu

1 Answer

How do I remove 1996 honda accord heater fan switch? I'm not sure if I need a new switch. Heater fan works only on high speed "4"


if the fan/motor only works on max No 4 setting ? then may i suggest you have a resistor fault or commonly known as a reostat in uk this is the component that provides the relevent reduced speeds on selection but when it fails only max speed works so you should find this unit attached on heater fan exterior if you follow wires from actual motor it will connect to the resistor unit ? then onward to switch control it is not to difficult diy and if you have access to manual/ it will give location/access for renewing? hope this helps/inspires you to diy ?

Dec 23, 2009 | 2000 Honda Accord

2 Answers

Need wiring diagram for fan speed switch on 2003 gmc sierra


the fan control balast (or speed controler) is burned out. by design if it only goes high, its junk. replace it and youll have it fixed. should be by the fan under the dash on the passenger side.

Nov 15, 2009 | 2003 GMC Sierra

1 Answer

Heater fan control


It is under the right side of the dash. Blower resistor and relay.

Aug 16, 2009 | 1991 Chevrolet S-10

1 Answer

The blower fan speed control stopped working


usually a bad blower resistor is at fault...

Feb 05, 2009 | 2002 Pontiac Grand Prix

2 Answers

Speed fan control is not working on 4 and 5


Had same problem on my 2000 Silhouette. The heater blower resistor block was burned out for fan speeds 1-3. This can be confirmed by disconnecting connector and using a checking continuity with VOM. The block is located behind the blower housing (just above the passenger's feet). Had to drop the blower motor to ease access. Resistor block is held in with three small screws, the back one can be a challenge - a small stubby or flex- shaft driver helps. Resistor block cost about $55 at dealer (more robust resistor pack than OEM). Haynes manual describes R&R fairly well.

Nov 18, 2008 | 2000 Oldsmobile Silhouette

2 Answers

Fan speed switch only works on #5


Call your local GMC Dealer and see if they have the climate control panel in stock. What happens is the circuit board on the back of the panel shorts out. The panel comes as an assembly and is very easy to replace. Don't go with a wrecking yard piece. I made that mistake once and it didn't work either. I got one from the Chevy dealer and it worked perfectly.

Aug 21, 2008 | 2002 GMC Sierra

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