Question about 1999 Chevrolet Silverado 1500

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My fans stays running on high speed even when key is off and truck is left. 1999 Silverado 1500. I disconected the dash fan speed switch and it is still running. I can pull the 30amp fuse in the underhood electric panel to kill it. I'm thinking it is the relay at the fan motor. Is this a seperate item or do I have to replace the whole fan motor assembly?

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There's a fan relay in the relay/fuse box under the hood. sometimes they get stuck on.

Posted on Oct 04, 2009

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1 Answer

How do you fix a fan speed switch that won't blow until it's on 4 or 5 in a 2004 z71 Chevy Silverado 1500


you need to replace the fan resistor located by fan motor if not there then trace red and black power wires to locate resistor behind or under dash it wont be mounted far from fan motor

Mar 13, 2016 | 2004 Chevrolet Chevrolet Silverado 1500...

1 Answer

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

Blower moter will not shut off when I turn the key off.


More than likely it's the blower motor resistor. Gm's wonderful electrical engineers decided it was a good idea to run constant power to the high speed fan relay which is part of the resistor assembly. When the relay stick the fan stays on. The resistor is located under the dash on the passenger side ne'er the blower motor. There is a plastic trim pannel that will need to be removed from under the dash in order to see it. It is typically help in place with two screws that you will need a 5.5mm socket to remove (yes it's a 5.5mm socket). Lmk

Jan 31, 2012 | 2002 Chevrolet Silverado 1500

1 Answer

Blower running full power - unable to control


your high speed fan relay contacts are stuck together that power the fan,normally the selectot switch on the dash controls power to the relay for on and off,but when the contacts weld themselves together you no have control over the fan speed even with the key off,its probably under the hood in a black box marked relays and fuses,remove the relays one at a time till it kills the fan,sometimes hitting the offending relay on the ground will break the contacts loose,but still replace it

Jun 15, 2010 | 2003 Chevrolet TrailBlazer

1 Answer

1999 silverado fan switch only runs on speed3 and up how I fix this problem


Either your fan resistor pack needs changed or the fan switch itself.

The resistor simply unbolts from the blower box by two screws .

The switch, you must remove it from the dashboard.

Nov 13, 2009 | 1999 Chevrolet Silverado 1500

1 Answer

2003 silverado blower fan stays on..


under the passenger side dash, right above floor board there is a wire connector. That connector is for your blower resistor. If you unhook it, the blower will stop running, hook it back up and you will have a blower. You can also remove the fuse. Point being you can use your truck. Order the new part and replace it. I can't remember how many wires went to it off hand, its rectangular, mayber 6-7or 8ish.

Jul 11, 2009 | 2003 Chevrolet Silverado 2500HD

1 Answer

Blower working on and off minimally


either the blower motor is about to go out or the wires to it are shorting.check the wire going to the motor from the blower resister.It is possible the plug itself has gotten hot and is burnt. passenger side under dash

May 15, 2009 | 1999 Chevrolet Silverado 1500

1 Answer

99 chev. Silverado heater motor problem


its time to replace the fan motor before it goes all the way out

Feb 05, 2009 | 1999 Chevrolet Silverado 1500

3 Answers

2004 Chevrolet Silverado Heater/AC Blower on without Ignition ON


there is no relay for the heater fan it's a 15 amp fuse and is on the accessories circuit. the reostat is responsible for all 3 speeds .with the key off there should be no voltage to the blower motor whether the fans speed fan switch is on or off. the fuse will be located in the fuse paneleither on the drivers left side in the dash or underneath the dash in the fuse block. you have a short in the harness that is under the dash and most likely it's a bad plug on the harness. your going to have to do some searching but that's where the problem short is... please rate

Oct 03, 2008 | 2004 Chevrolet Silverado 1500 Crew Cab

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