Question about GMC Denali

2 Answers

2005 gmc sierra radiator fan staying on

I have a 2005 gmc Sierra 1500 and the radiator fans are staying on after the truck is off had to unplug them and it still drained my battery dead

Posted by on

  • 6 more comments 
  • nvstein4
    nvstein4 Dec 02, 2012

    I put a new relay and coolant temp sensor and the fans still run with truck off

  • teds repairs
    teds repairs Dec 02, 2012

    you have 2 things left the fans or the computer

  •  ali abbas
    ali abbas Dec 02, 2012

    only one fan is coming on or both the fans? is it running is full speed or slow ? i am going to look at the wiring diagram reply my questions mean wile.

  • nvstein4
    nvstein4 Dec 02, 2012

    Both fans and they are on full speed

  •  ali abbas
    ali abbas Dec 02, 2012

    it seems like there are three fan relay which one did you changed

  • nvstein4
    nvstein4 Dec 02, 2012

    When i unplugged number one the fans shut off i checked all three but number one is what is kicking them on

  •  ali abbas
    ali abbas Dec 02, 2012

    ok hold on did you change the number one only ??? try taking all three out then put the number one in check if the still come on ? one circuit on this acts like a seriese circuit.

  •  ali abbas
    ali abbas Dec 02, 2012

    just use the new one in each slot one at a time. if the problen continues there could be a wire grounding some where. and its a ground wire which brings the signal from the pcm. you can also ckeck the out put signal from the pcm to the high speed fan relay if the computer is giving the ground signal then its the pcm. now keep this in mind the if there that wire is shoet to ground the reading you get from the pcm will not be good in order to get the correct reading you will have to cut the wire near the pcm and check if there is any ground signal comming out of it . its getting complicated god helps you. i hope its the relay.

×

Ad

2 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Master
  • 2,101 Answers

Check the repays that run the fans or the coolant temp sensor

Posted on Dec 02, 2012

Ad
  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that got 5 achievements.

    Governor:

    An expert whose answer got voted for 20 times.

    Filmmaker:

    Uploaded 5 video answers.

  • Expert
  • 104 Answers

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

2005 gmc sierra radiator fan staying on - 12_2_2012_10_33_30_pm.gif

Posted on Dec 02, 2012

Ad

6 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

  • 5 Answers

SOURCE: I have a 2005 GMC Sierra 1500 with 100,000 miles

On most GMC Models and CHevy for that matter. There is a hole towards the bottom but still on the side of the radiator. I had to run a small hose from that port to a container on the ground. I did this for a few times and it really helps keep your garage floor clean and clear. I also found it to be a bit of a nuissance to flush the radiator.

Posted on Oct 24, 2009

cshubart
  • 146 Answers

SOURCE: My Power window on my 2003 GMC Sierra 1500 Truck

if your main switch panel still works the passenger window and if door locks still work probaly bad window motor

Posted on Oct 21, 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

  • 167 Answers

SOURCE: 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.

Posted on Feb 16, 2010

  • 1608 Answers

SOURCE: 2004 gmc sierra 1500 blower motor location

The blower motor is on the passengers side under the dash.You might have to remove the a lower panel.This is the insulator panel.If the blower works at all just turn it on and follow the noise.Hope this helps.Good luck.

Posted on Apr 08, 2010

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

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
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
Diagnose Engine Cooling Fan Relay Problem
2007 Chevy Silverado Fans Always Run Engine Cooling Problem 2007
cooling fan running all the time

Jun 28, 2016 | 2010 GMC Sierra 1500

1 Answer

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

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


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

Feb 08, 2012 | 2005 GMC Sierra

2 Answers

My gmc sierra says engine hot ac turned off


My truck just did the exact same thing -- and it was a Sensor -- cost me $40.00 to get repaired at a local auto repair shop.

Sep 27, 2010 | 2008 GMC Sierra 1500

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

1 Answer

2005 GMC Sierra overheating


Probably the thermostat.

Jan 03, 2009 | 2004 GMC Sierra 2500

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

Related Topics:

438 people viewed this question

Ask a Question

Usually answered in minutes!

Top GMC Experts

yadayada
yadayada

Level 3 Expert

76682 Answers

Freddy

Level 3 Expert

1311 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22219 Answers

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

Answer questions

Manuals & User Guides

Loading...