2005 Chevy Silverado 5.3. Fan motors turn on mysteriously and with AC on the motor misfires

Asked by Aug 25, 2015 at 11:35 PM about the 2005 Chevrolet Silverado 1500 SS Ext. Cab Short Bed 2WD

Question type: Maintenance & Repair

I'm back to square one. My battery died and had a replacement installed. Next
day, with the AC on the motor began to mis-fire.  Fuel smell was all in the
truck. Took it to my mechanic who ordered a tune up, replaced all plugs and
wires. Mis-fire continued. Got the truck back and drove it for two days. Truck
would not start. The motor fans began to run in the middle of the night and
drain the battery. Back to the mechanic and a new computer was ordered,
flashed to my VIN and installed. Less than a week later, the truck is back to
same issues: mis fires with the AC on and fan motors are running without key
in the ignition. Is is a bad computer part?  Ignition? Something else?

3 Answers

70,875

This is just a guess but I'm thinking bad engine ground. The fans, a/c compressor, and ignition system all need good engine grounds to work correctly. When you have a bad ground sometimes current will "leak" through other circuits to find a ground. Also, both the a/c compressor and the cooling fans run when the circuit is completed to ground. Either by you pressing the button on the dash (a/c) or by the PCM. HTH. -Jim

10,390

What did he find on the first repair? Change a computer is almost insane ... since the introduction of Boeing's 777 there is not one mechanical linkage from the pilot to the control surfaces. The plane is "Fly by wire" .. my point is that over 500 people's lives are dependant on that computer not failing. To have 1 fail in a car is very,very unusual but to have 2 fail with exactly the same failure is unbelievable. First thing you have to do is find a mechanic instead of a "Parts Changer"

1 of 1 people found this helpful.

Did you find the fix to this issue? I am having the very same problem.

Your Answer

Silverado 1500

Looking for a Used Silverado 1500 in your area?

CarGurus has 167,963 nationwide Silverado 1500 listings starting at $1,000.

ZIP:

Chevrolet Silverado 1500 Experts

  • #1
    John Carson
    Reputation
    2,660
  • #2
    Rowefast
    Reputation
    2,000
  • #3
    Silverado_owner_2006
    Reputation
    1,710
View All

Related Models For Sale

Used GMC Sierra 1500
1,005 Great Deals out of 66,526 listings starting at $2,495
Used Ford F-150
2,512 Great Deals out of 193,861 listings starting at $799
Used Chevrolet Silverado 2500HD
316 Great Deals out of 29,873 listings starting at $3,500
Used Dodge Ram 1500
370 Great Deals out of 10,765 listings starting at $1,500
Used Toyota Tundra
480 Great Deals out of 33,133 listings starting at $2,000
Used Toyota Tacoma
585 Great Deals out of 43,856 listings starting at $2,200
Used Chevrolet Tahoe
708 Great Deals out of 41,339 listings starting at $1,995
Used Chevrolet Colorado
269 Great Deals out of 33,734 listings starting at $1,900
Used Ford F-250 Super Duty
313 Great Deals out of 45,081 listings starting at $1,700
Used Chevrolet Silverado 1500HD
8 Great Deals out of 260 listings starting at $2,195
Used Chevrolet Silverado 2500
5 Great Deals out of 221 listings starting at $2,888
Used Nissan Titan
212 Great Deals out of 20,495 listings starting at $3,695
Used GMC Sierra 2500HD
103 Great Deals out of 13,801 listings starting at $2,999

Used Cars For Sale

2018 Chevrolet Silverado 1500 For Sale
49,496 listings starting at $22,310
2017 Chevrolet Silverado 1500 For Sale
181 Great Deals out of 56,817 listings starting at $16,013
2016 Chevrolet Silverado 1500 For Sale
223 Great Deals out of 6,931 listings starting at $17,202
2015 Chevrolet Silverado 1500 For Sale
370 Great Deals out of 11,655 listings starting at $12,950
2014 Chevrolet Silverado 1500 For Sale
401 Great Deals out of 13,053 listings starting at $9,500

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.