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?

280

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?

5 Answers

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

5 out of 5 people think this is 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)~

2 out of 2 people think this is helpful.
280

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

1 out of 1 people think this is helpful.
56,845

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 out of 2 people think this is helpful.

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

1 out of 1 people think this is helpful.

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