Excessive engine fan cycling

[axe]

(03-02-2017 )Matt Wrote:  I'm having trouble with the fan having random 'fits' of where while going down the road the fan will start cycling on for 30 to 60 seconds then off for a second and then back on. It'll do this a few times and settle down. It seems to be triggered by acceleration up a small hill in the road bit not every time. Temps are totally normal at 185 coolant and 230 oil. It's on a 08 kw t660 with a isx871 with MM. The only other thing to mention is that the ac system sprung a leak and is discharged at the moment. This didn't start when it discharged though. Any ideas on what to look at?

Low Freon will make it cycle, AC high pressure switch bad will, along with air leak at fan clutch or air line feeding it, as well as the solenoid. On our Pete it was dirty connection on high pressure switch. Hope that helps.