Hey guys, '98 FLD120 w/ 6TS 3406E. A/C and defrost are NOT on. Engine has been at a constant 180-185 all day but the fan will kick on n then shut off 15 seconds later. What could it be? It started doin it last night n was normal before that.
Engine fan coming on periodically
Discussion in 'Trucks [ Eighteen Wheelers ]' started by CbarM, Oct 7, 2013.
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Had a similar issue, bypassed the wiring, and had it fixed. I'm sure you will have everyone ask you to replace the wiring harness.
Seems to be a common issue, if it doesn't, sounds like it will be time to look into ecm. This was just my experience. -
4 things control the engine fan.
1. fan override switch.
2. coolant temp sensor.
3. a/c hi pressure switch.
4. intake manifold temp sensor.deming807 Thanks this. -
Could the intake temp sensor also make it run rough at times when taking off?? Its been doing that also from time to time and getting worse as the days go by.
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