My 2005 Yukon XL

[Will L.]

Air pocket most likely

 

[DieselSlug]

On your cooling fans, you can bypass the ECM on them without any ill effects or even add an extra controller keeping the ECM in the loop. I have this controller on my 95 controlling the electro-viscous fan clutch, but it's made for electric cooling fans. it's design is for dual fans and includes an override for the AC.

This one uses a sensor with 1/8" pipe thread. Haden also offers the same controller with a "stick in" sensor that you push into the fins of the radiator if you don't want to drill and tap into a coolant passage on the engine.

Amazon.com

Thanks for sharing this. Might be a low cost option. I've been looking at canned tuners, because I really don't want a full blown tune. Currently the controller works of a set of relays for that ground the trigger wires. One ground and the fans are on low. Ground the second one simultaneously and both fans come on high.

Not sure why this post is automatically putting in the below comment. Doesn't even show up on my post editing page.

 

[MrMarty51]

Thanks for sharing this. Might be a low cost option. I've been looking at canned tuners, because I really don't want a full blown tune. Currently the controller works of a set of relays for that ground the trigger wires. One ground and the fans are on low. Ground the second one simultaneously and both fans come on high.

Not sure why this post is automatically putting in the below comment. Doesn't even show up on my post editing page.

Does that whenever an amazon product is linked to this site.
IDK if it does that to other forum sites.