1998 kw w900 n14
So recently we got my fan clutch working and my AC.
Problem now is my AC works but the fan doesn't come on when it's needed so I have to run the fan manually as not to damage my compressor. We've checked everything. Installed a new fan switch and nothing. At this piont we think there is a broken wire.
Can I run a new jumper wire? Like from the fan override sensor to the compressor? Or where ever it goes? Does anyone know where a can run a jumper wire?
Fan doesn't come on with AC
Discussion in 'Kenworth Forum' started by irishluck09, Jun 14, 2022.
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So if you look at the diagram I attached in your other thread, the A/C high pressure switch is an input to the ECM. It is called a Unitary Switch on diagram, has A5 next to it. Wires going to it are gray (common from ECM) and green/white (signal to ECM). Signal goes to connector A of ECM, pin #8. If circuit is intact, just unplugging the pressure switch should make the fan come on.
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Not necessarily. If you look at the diagram, the switch is a Normally closed switch. When refrigerant pressure on high side increases, the switch opens and circuit is opened letting ECM know to turn on fan. If wire was open the fan should run all the time. You really need Insite or a quality scan tool so you can see the status of the a/c high pressure switch that ECM sees and go from there.
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When we got the AC fixed we did try a brand new High pressure sensor and also put on a brand new plug as well. -
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I want to charge the ac on my 04 Ken t800, can’t find the low side port. Can someone point me in the right direction.
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