Overheating issues

[Paperfinch]

So for starters I have a 2006 GMC Sierra 1500 4x4 v8 5.3L. it's my daily driver and I've had it for a little over a year with minimal issues just normal maintenance (brakes, oil changes, alternator). How ever it started over heating and leaking coolant recently. No big deal, I changed out the thermostat and water pump, that fixed the leaks as far as I can tell. But the temperature gauge will go up to the 3/4 mark and then the fans kick on and they're LOUD. It has the electric fans directly behind the radiator and not the clutch fan assembly. They're expensive to replace and I don't really want guess at this point. Just looking for some advice at what I could potentially diagnose myself without going to a garage. I should also mention the truck is not throwing any codes at this time. Any advice would be appreciated. Thanks in advance!

 

[G-822419]

Any updates on this? Same issue here

 

[98trck]

do you notice any differance in fan speed when the a/c is on?
the fans are variable speed, maybe a bad connection, unplug and plug back in the fans
what tempiture thermostat did you use and did you test it in a pan of boiling water and a tempiture gauge?


PETE