hello i buy a freightliner century with a 3406 cat ,1998 and the fan clotch,,is free when the truck have no air ,,,but if i turn on the truck and get air the fan turn on and dont came off again ,,i already change the valve below the antifreeze tank, and still the same ,,please anybody know about ut ,,thank you
3406 cat fan work all the time
Discussion in 'Trucks [ Eighteen Wheelers ]' started by yoelmoreira, Jul 14, 2014.
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Is the manual override switch on?
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no is not swicht on dash
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Check temperature sensors one might be bad. Also check the electric wires runs into the air switch.
yoelmoreira Thanks this. -
thats the sensor on top of the motor¿.¿ and the wired coming from where¿. bcz i put a new air valve today,, the one below the tank
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Possibly one of those coolant temperature sensors screwed into the cylinder head is telling the fan to come on. On my 3406 I think it's a two wire switch/sensor located between the two head covers above the exhaust manifold.
Does the engine fan still come on when the air conditioning is switched off?yoelmoreira Thanks this. -
ok i will tomorrow thank you much
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