I have a 2005 1500 silverado and the radiator fans are staying on after the truck is off and drained my battery dead. Replaced the relay but no luck there. Any suggestions?


Asked by Dec 28, 2013 at 08:48 PM about the 2005 Chevrolet Silverado 1500 Z71 Crew Cab 4WD

Question type: Maintenance & Repair

In addition SES indicated knock
sensor code. Had the knock sensors,
cleared codes, and SES has not turn
back on, but the cooling fan is still
draining the battery. I read some post
about Powertrain Control Module
being relate to both.

*knock sensors replaced*

Any suggestions?

6 Answers

block temperature sensor~ https://www.google.com/#q=2005+Chevrolet+Silverado+block+temperature+ sensor

12 people found this helpful.

scrub the main ground clean with a wirebrush, as this gets a layer of corrosion with every start...wirebrush and pliers for the lug end....wirebrush for the spot where it bolts to...put them together for restored ground potential and the modules will behave themselves then~.....with a NEW battery (if older than five)~

4 people found this helpful.

Ok, I need to clean the block temperature sensor connector, or the fan connector?

1 people found this helpful.

I'd check for a stuck relay. Take the handle end of a screwdriver and tap the relays that are in the underhood fuse box. If the fans stop, it's a bad relay. And yes, the cooling fans are commanded on by the PCM if the coolant temperature exceeds a certain point. Usually around 220°F or the air-conditioning is turned on. HTH. - Jim

2 people found this helpful.

Srvelis1....replace these items...they are cheap...test for continuity...leakage to ground with your multimeter~

2 people found this helpful.

I replaced the heat temperature sensor and the relays are all good , fans are still on , any suggestions

3 people found this helpful.

Your Answer

Silverado 1500

Looking for a Used Silverado 1500 in your area?

CarGurus has 148,955 nationwide Silverado 1500 listings starting at $828.


Chevrolet Silverado 1500 Experts

  • #1
    John Carson
  • #2
  • #3
    Andrew Olsen
View All

Related Models For Sale

Used GMC Sierra 1500
695 Great Deals out of 58,592 listings starting at $1,995
Used Ford F-150
2,308 Great Deals out of 214,784 listings starting at $1,300
Used Chevrolet Silverado 2500HD
363 Great Deals out of 29,630 listings starting at $2,000
Used Dodge Ram 1500
308 Great Deals out of 9,478 listings starting at $1,750
Used Toyota Tundra
471 Great Deals out of 38,501 listings starting at $1,999
Used Toyota Tacoma
410 Great Deals out of 44,281 listings starting at $1,995
Used Chevrolet Tahoe
523 Great Deals out of 36,457 listings starting at $1,299
Used Chevrolet Colorado
265 Great Deals out of 41,257 listings starting at $1,900
Used Ford F-250 Super Duty
360 Great Deals out of 41,917 listings starting at $1,600
Used GMC Sierra 2500HD
131 Great Deals out of 15,475 listings starting at $3,705
Used Ford Mustang
252 Great Deals out of 36,666 listings starting at $2,500
Used Chevrolet Silverado 2500
207 listings starting at $4,495
Used Jeep Grand Cherokee
771 Great Deals out of 75,753 listings starting at $899

Used Cars For Sale

2018 Chevrolet Silverado 1500 For Sale
67 Great Deals out of 90,175 listings starting at $18,998
2017 Chevrolet Silverado 1500 For Sale
141 Great Deals out of 9,514 listings starting at $16,995
2016 Chevrolet Silverado 1500 For Sale
173 Great Deals out of 6,507 listings starting at $13,950
2015 Chevrolet Silverado 1500 For Sale
245 Great Deals out of 9,954 listings starting at $10,995

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.