So I searched e-fan problems on the site and all I can find is about putting e-fans an earlier trucks that didnt have them before. My problem on my 06 is that the weather is starting to get warmer and when I was sitting stopped and ideling earlier for a good 10 min the truck got up to about 225 or so and the my fans never turned on high. Is this something that I finally need to get a tune change for or is there something with the truck I need to look into? It had a new stat and coolant flush about six months ago. What do you guys think, I want it tuned but I have a wedding coming up soon but dont want over heating issues all summer.

 

The fans will not go on 'hi' unless the A/C in on. Was it?

The fans actually were running, correct?

 

No the A/C was off and I did pop the hood to check and they were both on. Low does not seem to move much air when the truck starts getting a little warm.

 

As long as it is not getting hot enough that the 'Check Gauges' light is coming on, you should be good.

Next time you see it going up like that, turn on the A/C, it might take a little while for the pressure to build up, but the fans will go to 'high' and should cool it down.

 

I saw my 05' yukon do the same thing in 107* texas heat. It ran warm with the AC off, but turn the AC on and it drops right down.

 

Is it tuned? or factory?

Factory tune is set to turn the Fan#2 on high at 235*F off at 228*F
Fan#1 on at 226*F and off at 219*F
or if the AC pressure reaches the set PSI

It will come on if it reaches that temp and off when it gets to the lower temp.. So its all right.

You can always run a couple manual switchs to them so you can override the PCM when you want.

 

Or get it adjusted with a tune.

 

id like to ditch the clutch fan in my 02 and throw in a couple electric fans, is there a way to trigger the fans through a tune on my truck?

2002 Yukon XL Denali

 

yes, its the same PCM as the Fbodys

 

TRUE!

and still put some manual override switchs in there