Question about 1996 GMC Yukon

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High speed on blwer

Relaced blower last year because it burnt up.All speeds work except, high speed.Switch is new, and relay is energizing or deenergizing not sure.What to chech next.

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  • Anonymous Aug 29, 2008

    2005 Yukon, high speed (5) air will not blow at all, I have to lower the

    fan to 4

  • mlozano May 04, 2009

    Yukon 1996, the blower fan make a very bad noise and work only in high speed, if I turn to lower speed don't work.

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I have a 1996 yukon and i cant get 1 2 or 3 to work on the fan control but 4 does work

Posted on Oct 11, 2008

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Engine cold. Start engine reading says engine hot ac off. Fans run all time.


Are the fans running on low or high ?
Circuit/System Description
The engine control module (ECM) commands the fans ON in either high speed or low speed, depending on cooling requirements. In low speed, both fans are turned ON at a reduced speed. High speed has both fans turned ON at full speed.
In low speed operation, the ECM applies ground to the coil side of the fan low relay. This energizes the coil and applies voltage directly to the left cooling fan through the switch side of the fan low relay, which is fed by the fan 1 fuse. The right fan is connected in series to the left fan through the de-energized fan control relay so that both operate at low speed.
In high speed operation, the ECM applies a ground to the coil side of the fan low relay, the fan control relay , and the fan high relay. On the fan high relay, the energized coil closes the switch side of the relay and applies voltage directly to the right cooling fan through the switch side of the relay, which is fed by the fan 2 fuse. At the same time, the ECM energizes fan control relay pulling the switch side over, providing a direct path to ground for the left cooling fan, which has voltage applied through the energized fan low relay. In high speed mode, the fans are operated as a parallel circuit with full voltage applied to each.
You should have it hooked up to a scan tool that can read engine sensor data parameters . Check for DTC'S - diagnostic trouble codes etc...
Circuit/System Verification
  1. If DTCs P0480 or P0481 are set, perform those diagnostics first.
  2. Ignition ON, verify with a scan tool that the control module is not commanding fan activation.
  3. Ignition ON, observe that the fans are not activated.
Your best bet is to take it to a ASE certified repair shop !

Jan 10, 2016 | 2009 Chevrolet Silverado 1500

1 Answer

I'm driving in rain, wipers working good, all of a sudden they quit! I drive for 15 min, check again, they work for a while, then quit again...what in the problem?


If your not familiar with automotive electronics an module control of components , I suggest you take it to the dealer . They have the tools to diagnose this type problem !
The Wiper/Washer System consists of the following components:
?€¢
Windshield wiper/washer switch


?€¢
Body control module (BCM)


?€¢
Wiper PCB relay


?€¢
Wiper high PCB relay


?€¢
Windshield wiper motor


?€¢
Windshield washer fluid pump


?€¢
Windshield washer fluid level switch


?€¢
WPR fuse 25 A


?€¢
WSW fuse 10 A


Low Speed Operation
When the wiper switch is in the low speed position, ground is applied through the switch internal resistor and the wiper switch low signal circuit to the body control module (BCM). In response to this signal, the BCM energizes the WIPER PCB relay by applying battery voltage through the wiper relay control circuit to the coil side of the relay. This allows battery positive voltage from the WPR fuse to flow through the switch input side of the WIPER PCB relay and out to the switch input side of the WIPER HIGH PCB relay. Since the wiper high relay is de-energized and its switch contacts are normally closed to the low speed control circuit of the windshield wiper motor, the motor will operate at low speed.
High Speed Operation When the wiper switch is in the high speed position, ground is applied through the windshield wiper switch high signal circuit to the body control module (BCM) indicating the wiper high speed request. In response to this signal, the BCM then energizes the wiper PCB relay, as stated above, and the wiper high PCB relay by applying ground through the control circuit to the coil side of the relay. With the wiper high relay energized and its switch contacts closed to the high speed control circuit of the wiper motor, the motor will operate at high speed.
Wiper motor high speed operation and the wiper high speed PCB relay can also be commanded ON/OFF by using a scan tool. Refer to Control Module References.
DTC B3715 02: Front Wiper Relay Drive Circuit Short to Ground
DTC B3875 00: Wiper High Speed Relay Circuit
DTC B3922 00: Front Wiper Function Select Circuit
You could Have a switch problem , BCM problem ,PCB relay problem , the pcb relays are non serviceable an the whole under hood fuse box would need to be replaced . Malfunctioning motor bad ground some where etc.....

Dec 20, 2015 | 2008 Chevrolet Impala

1 Answer

2004 dodge Dakota heater motor won't work on high speed I think high speed relay is bad I can't find it do you know where relay is located


there is no relay for high speed, the blower relay is only for all other speeds except high. The high speed has a direct 12v lead to it (fused). you will need to check for 12v supply at the motor. If no voltage you woll need to check fuse.

Jan 21, 2014 | Cars & Trucks

1 Answer

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.

Feb 01, 2013 | 1992 Chevrolet C1500

1 Answer

All the heater blower speeds work on my 1998 Suburban except the high speed. I have replaced the blower motor and the switch. What else could the problem be? I have seen some writings about a resistor but...


Hello Boco.

In your Suburban there is a high blower relay.
When the switch to high is selected it activates a relay to another circuit that is fused separately.
This fuse in under the hood marked blower fuse 3 which is a 50 amp fuse.
This is most likely the problem.
However, if it isn't then the problem becomes the relay, the switch or a broken wire.
If it isn't the fuse, contact me back here using comments and I will help you with the next step in fixing your heater blower.

Thank you for using FixYa.

KL

Jan 21, 2011 | 1998 GMC Suburban

3 Answers

My a/c only works on high. I was told that it was the blower motor resistor not sure where is located.


It's located near the fan motor on the passenger side duct work. It will have a harness plugged into it.
It's mounted with 2 sonic welds, to remove it pry under the mounting points to snap the welds. The replacement resistor is mounted with 2 self tapping screws.

Jul 21, 2010 | 2006 Chevrolet Colorado

2 Answers

Heayer doesn't work


The resistors provide resistance in the circuit, dropping voltage to the blower motor to slow the motor speed down. On high, the blower receives full voltage through the blower relay.

If you had High but no other speeds, then the resistor pack is usually the culprit. If you have all other speeds but high, the most common problem is going to be the blower motor itself, relay, or the switch panel.

You can check this by turning the fan speed to "high", unplug the blower motor, and check to see that you have roughly at least 12v at the plug. If you have 12v, that means the switch panel is activating the relay and the relay is working. Over time, heat kills the magnetic properties of the magnets inside an electrical motor. Without enough magnetic energy, you may not get enough opposing force to spin the rotor full speed when the windings energize, but still enough to spin at lower speeds.

Another thing you can check is the connector at the blower motor and the switch panel. Sometimes these will heat up, start to deform, and cause a bad connection. The bad connection may be able to handle the lower current draw on low speeds, but the higher resistance from the bad connection won't be able to handle the higher current while in the full speed position.

Hope this helps, keep me posted. be glad to help you get your heater working again soon.

Jan 07, 2010 | 1995 Chevrolet Tahoe

1 Answer

I have a 2000 Impala LS my heater resister has blown out 3 times in the last year , also blower work in 1,2,3,4 speeds but not on # 5. what is going on ?


The blower motor is bad. Just because it runs it's drawing too much power some of them are bad when new. 5 speed runs right off the switch and the high relay as they get damaged by the high load of the bad motor too. This is common and it happens alot to cars with over 100thou miles.

Nov 02, 2009 | 2000 Chevrolet Impala

1 Answer

Blower stuck on high speed


yes it will run on high with the resistor unpluged i would have to say your resistor is bad if it does not work at any other speed than high please rate and let me know -jeff

Aug 26, 2008 | 2003 Dodge Grand Caravan AWD

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