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05 Silverado 1500 cooling fans run battery down


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SWPRATHER
New User

Apr 6, 2021, 3:57 PM

Post #1 of 3 (331 views)
05 Silverado 1500 cooling fans run battery down Sign In

My 05 Silverado 1500 cooling fans start up an hour or so after ignition shut down. The fans run until battery dies.

200,000 miles. Engine swapped out a month ago but fan issue didn't start until this week.

Currently disconnecting battery after each use.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Apr 6, 2021, 5:20 PM

Post #2 of 3 (314 views)
Re: 05 Silverado 1500 cooling fans run battery down Sign In

The cooling fan system uses 3 relays. Any one sticking on can cause this. I would start pulling relays when the fan does this.





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Tom Greenleaf
Ultimate Carjunky / Moderator
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Apr 6, 2021, 6:17 PM

Post #3 of 3 (297 views)
Re: 05 Silverado 1500 cooling fans run battery down Sign In

A trick that works 1/2 the time when or if a stuck relay. When or if you can catch it, whack* those relays one at a time. If one makes it work properly is a lucky find which one.
By "whack" I mean like a somewhat firm tap/whack on relay with the plastic end of a screwdriver. Duh, toss that one + take apart the old one see points inside are odd looking.


I'm not sure these have anything to do it that's the problem with the engine swap but do look around for bumped wiring, bad plug connections from just the remove and replace many harnesses are inside that split plastic you can get a view without harming it or area that might have been squished.
It's nice to know and see something broken or wrong not just wonder till enough time never does it again,


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