Another "What's That Noise" Thread
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New User
Joined: Jul 2008
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Another "What's That Noise" Thread
2004, F250 SD, KR, 6.0 PSD, Fx4 w/Off-Road Pkg, 48K miles, no mod's.
I pulled a 9,500# load Saturday for the first time.
At average speed of 50mph, periodically heard a noise sounding like the radiator fan kicking on. The sound would go off-on-off sometimes for just a few second cycles, other times it would stay "on" for a minute or so.
Is it just the cooling fan?
If so, why would it "fast-cycle", and not stay on longer?
If not, what was it?
I pulled a 9,500# load Saturday for the first time.
At average speed of 50mph, periodically heard a noise sounding like the radiator fan kicking on. The sound would go off-on-off sometimes for just a few second cycles, other times it would stay "on" for a minute or so.
Is it just the cooling fan?
If so, why would it "fast-cycle", and not stay on longer?
If not, what was it?
Post Fiend
Joined: May 2006
Posts: 10,007
Likes: 4
From: Central Florida
The cycling makes it sound like the AC compressor. The AC is active during AC (duh) and when you use the defroster (to dry the air a bit). The engine coolant fan should have a thermostatic clutch of some kind. If the air temps were low, I could see where the clutch would lock and unlock as it cooled off.
Lead Driver
Joined: Jul 2003
Posts: 7,406
Likes: 52
From: Wheatland, Mo
It sounds like the cooling fan for the radiator. With the weather temps being lower this time of year, it shouldn't be kicking in unless you are hauling a heavy load and really heating up the engine. I would first check coolant levels to make sure you aren't low.
