Hi All,
Want to preface this by saying that I have looked through many threads regarding the electro-viscous fan clutch, and I'm still stumped.
The problem started on a long road trip, where it threw a fan speed too high code. Since the road trip, the fan would not seem to change speed, nor was it fully engaged. I also hooked a snap-on scan tool to it, and when commanding it to change speeds, it would not do so. The engine would be very rough at idle and vibrate the whole vehicle, as if the fan wasn't fully disengaging.
I replaced the clutch recently, with the AcDelco/Behr OEM replacement from amazon, and now it's even worse. The fan is stuck fully engage (jet engine sounding) at cold startup, and disengages after 2500 rpm (revved at idle or driving), then seems to operate as "unlocked." I can stop the fan by hand at idle, and when revving engine, it does not start to pull/tug as if it was commanding a lockup. I have yet to test this while commanding lockup with a scan tool.
I have checked the #20 fuse and relay, and have swapped the two solid state relays in the underhood engine block with no change.
While I have found a few test procedures to try, none are very clear or seem to apply to my situation completely. If anyone can offer any advice on how to track down the problem, I would greatly appreciate it. Thank you!
2005 GMC Envoy 4.2L
Want to preface this by saying that I have looked through many threads regarding the electro-viscous fan clutch, and I'm still stumped.
The problem started on a long road trip, where it threw a fan speed too high code. Since the road trip, the fan would not seem to change speed, nor was it fully engaged. I also hooked a snap-on scan tool to it, and when commanding it to change speeds, it would not do so. The engine would be very rough at idle and vibrate the whole vehicle, as if the fan wasn't fully disengaging.
I replaced the clutch recently, with the AcDelco/Behr OEM replacement from amazon, and now it's even worse. The fan is stuck fully engage (jet engine sounding) at cold startup, and disengages after 2500 rpm (revved at idle or driving), then seems to operate as "unlocked." I can stop the fan by hand at idle, and when revving engine, it does not start to pull/tug as if it was commanding a lockup. I have yet to test this while commanding lockup with a scan tool.
I have checked the #20 fuse and relay, and have swapped the two solid state relays in the underhood engine block with no change.
While I have found a few test procedures to try, none are very clear or seem to apply to my situation completely. If anyone can offer any advice on how to track down the problem, I would greatly appreciate it. Thank you!
2005 GMC Envoy 4.2L