Cooling Fans

[Pepper]

2005 Tahoe 5.3 seems to be drawing my idling to about 5 @ stops and almost stalling.Fans are wide open (high).Could this be a battery issue?btw,walmart battery (1 yr old).Also throwing a po480.thx newbie

 

[Pepper]

2005 Tahoe 5.3 seems to be drawing my idling to about 5 @ stops and almost stalling.Fans are wide open (high).Could this be a battery issue?btw,walmart battery (1 yr old).Also throwing a po480.thx newbie

Also the voltage gage is fluctuating @ red light/stop with ac on.

 

[OR VietVet]

Welcome to the forum.

What is turned on when this happens? The a/c will trigger the fans every time but the engine temp only when needed. I recommend you look thru the threads of the "Big Three" here and may fix your concerns. Good luck.

 

[Rocket Man]

Sounds like the fan control is acting up. Are both fans running on high? With ac on and off? If it’s constant, your battery won’t stay charged if you’re doing a lot of idling, which will make your alternator kill the engine. Might be a stuck fan relay.

 

[Mudsport96]

Also could be corrosion on the ecm pins causing a ground issue.

 

[Fless]

Need to troubleshoot that P0480; it probably has a direct impact on the fan operation.

 

[Pepper]

That’s exactly what I’am going to do is use a friend who has a SnapOn live scanner (if that’s what there called) to activate certain functions and get to the bottom,without PARTS REPLACING.The temps never go over if it’s correct.Just bought it from a one owner and it’s been well taken care of.115,000

 

[Pepper]

I pulled the fan relay housing out and it like new underneath.Put dielectric grease on the 3 relays.

 

[Fless]

Don't discount @Mudsport96's comment about checking the PCM connectors. Pull both off and check for water intrusion and pin fitment. The fan pins are low in the connector and if there's water in there, that's what will be affected.

 

[Joseph Garcia]

Welcome to the Forum from NH.

Lots of knowledgeable folks here who freely share their knowledge, experiences, and perspectives. Knowledge is power.

I hope that you will become a participating member in the Forum's discussions.

Pics of the truck, please.

You are already receiving sage advice from the knowledgeable folks on this Forum.