Question about 2005 GMC Sierra

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Can't find relay for radiator cooling fan on 2005 GMC sierra

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  • GMC Master
  • 5,537 Answers

Go to Autozone.com and sign up and register your truck for FREE. Then you can scroll down to the Diagrams section which also has Fusebox and Powerbox layouts.

The Relays are usually in the Powerboxes under the hood. Sometimes the horn relay is identical to other important relays like your cooling fan relay.

If the layout shows this is true and the part numbers on the case of the part matches, then you can switch the relays and see if the fan works or the horn works.

The diagrams are also for the chassis and will help you trace the wires by color and will indicate through the wiring pattern of whether the relay is in the Powerbox or next to the fan.

Posted on Feb 08, 2012

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  • GMC Master
  • 14,036 Answers

Relays are located left end of the instrument panel.look inside owners manual in glove compartment, it has all fuses and relays locations.

Posted on Feb 08, 2012

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6 Suggested Answers

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Posted on Jan 02, 2017

  • 12650 Answers

SOURCE: 1997 Gmc Sierra fuel pump relay has no power

check fuse and fuse panel connections

Posted on Oct 29, 2009

Molson02536
  • 3854 Answers

SOURCE: 2004 GMC Sierra 4dr truck. the fan does not work

The switch or the wire harness at the blower motor has gone bad. The highest setting 5 has no resistor, so the blower runs on high but the high current flow ends up burning up the switch's contact on that setting or the resistor wire harness at the blower motor has gone bad. Common would be the switch it self, if the switch is good. Then it's going to be the wire leads at the speed resistor by the blower motor under the glove box by the passenger leg compartment. Keep me posted, be glad to help you get your Sierra running 100% again soon.

Posted on Jan 06, 2010

  • 172 Answers

SOURCE: 2005 GMC Sierra 1500 - heater blows, but only cold air

Check coolant level. Check for heat at the heater hose going from water pump to heater core at firewall. Check to see that cable is moving coolant control valve from the closed to open position. Low mileage so it shouldn't be plugged heater core.

Posted on Jan 07, 2010

Testimonial: "You were absolutely correct. Low coolant level. Put in some 50/50 and we're nice and toasty now, but need to find out why coolant was so low. Thanks."

  • 1024 Answers

SOURCE: 2005 gmc sierra fan won't blow high heat or A/C

check pins at the blower motor resistor
a- tan- med 1
b- yellow- low
c- pink - med 3
d- light blue- med 2
e- black- ground
f- orange- high
g- red- battery +
it could be the resistor

Posted on Mar 04, 2010

  • 462 Answers

SOURCE: cooling fan relay location on a 2005 gmc sierra

Check the fan clutch operation. And also check for leaks.

Posted on Mar 05, 2010

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1 Answer

2010 GMC Sierra radiator fan loud and seems to run all the time 5.3 vortex


Deanna, check to see if your A/C is in the on position, this could cause fan to run a lot. If this is not the case, take truck in for diagnoses at a good shop, could be a faulty heat/fan sensor or sticking relay. Check the attached links,instruction and guides, Good luck
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In the under hood fuse / relay box ! There are three of them COOLFAN/relay 1-2-3 . It's marked on the under side of fuse box lid .
The engine cooling fan system consists of 2 electrical cooling fans and 3 fan relays. The relays are arranged in a series/parallel configuration that allows the powertrain control module (PCM) to operate both fans together at low or high speeds. The cooling fans and fan relays receive battery positive voltage from the underhood fuse block.

Dec 22, 2015 | 2005 GMC Yukon XL

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I own a 2005 GMC Sierra which has been consistently low on radiator coolant and fluid level for a few months. There are no apparent leaks, have had the radiator looked at, but have not solved the...


look at the oil level and color if it is choco milk color probably head gasket.is the engine noisy or fan. if fan? it is locking up because of the high heat from rad.normal. if engine possible coolant in the oil.

Jan 27, 2015 | 2005 GMC Sierra

1 Answer

Cooling fans not working


a 2005 sierra comes with a cluch fan not an electric fan. sounds like you need to replace the thermostat

Mar 25, 2013 | 2005 GMC Sierra 1500

2 Answers

2005 gmc sierra radiator fan staying on


its coolent temp sensor for the radiator fan check it if not that a bad radiator fan relay.

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Dec 02, 2012 | GMC Denali Cars & Trucks

1 Answer

I have a 2005 Gmc Sierra. The fan doesnt work anymore and I checked the fuse and its fine. How hard is it to replace the relay?


When you say fan I assume that you are talking about the heater fan?? The fuse and relay are usually plug in modules. Fuses are usually under the dash and relays and some fuses are under the hood in a large black box on top of the drivers side fender. A description of fuses and relays is on the inside of the lid that you take off. If replacing them doesn't work then time for a new fan.

Nov 01, 2010 | 2005 GMC Sierra

2 Answers

Cooling fan relay location on a 2005 gmc sierra


If air is hot then cold it sounds like you have a sizable air pocket in the cooling system. This could be caused by a leak or if you have recently done anything to the system without bleeding it afterward.

Mar 05, 2010 | 2005 GMC Sierra

1 Answer

The fans begind me radiator willnt shut off in my 2005 gmc sierra


If you read the label on the radiator shroud/fan cowls, you will see that it says "Warning--These fans may operate at any time, even if the ignition is off."
This means that the computer monitors the coolant temperature through the sensor in the water neck, block, or radiator, and turns the fans on if any of them reports (true or not) that the coolant is too hot.
Obviously, there is nothing wrong with the fans, because they run.
First, check your coolant level; if it's too low, then the engine actually boils the coolant in the radiator, causing it to flash over to steam, which is hotter than the thermostat is set to allow the engine to operate. Check this in the radiator itself, not the coolant bottle, with the engine of course cold at the time of your check.
You have, at the least, a false signal from one of these sensors.
You could also have a faulty fan relay in the distribution box under the hood on the driver's side of the vehicle.
You could also have a faulty ECM (hope it's not that one...$$$).
Please let me know if this helps you, and remember to vote/comment.

Feb 16, 2010 | 2003 GMC Sierra

1 Answer

GMC Sierra A/C Stops Cooling After Driving a Few Minutes


It sounds like you either have an condensor fan problem or low freon. The condensor fan is near the radiator. In some cases the radiator fan doubles as the condensor fan. So look there too.

May 09, 2009 | 1991 GMC Sierra

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