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Cooling fan - A/C question


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Our trucks have a 2 speed hydrolic fan powered by the power steering pump. When the A/C compresser is turning ...



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Old 06-13-2014, 07:05 PM
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Cooling fan - A/C question

Our trucks have a 2 speed hydrolic fan powered by the power steering pump. When the A/C compresser is turning will the fan run on low or high speed? The fan turns but hardly moves any air. The shop tells me the high pressure cut out switch is turning the compressor off. Now they are trying to determine if it's mechanical or electrical. Everything seems to be pointing to the ECM not sending a signal for high speed fan. The motor does seem to run a little bit hot but The engine is new and this is the first time I drove the truck in about 3 months so I'm trying to remember how everything was. The stock P/S lines were just replaced with a braided kit (because of leak). I don't necessarily think this had anything to do with it. The steering works perfect so I think all the air is out of the system. Can the rack work but the fan still be air bound? Think anyone help me out?

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Old 06-13-2014, 10:09 PM
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Can some one please go out to the truck and see if the fan turns on when the AC compressor cycles? If so is it moving a lot of air?
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Old 06-13-2014, 10:18 PM
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Can some one please go out to the truck and see if the fan turns on when the AC compressor cycles? If so is it moving a lot of air?
Tried it on the car, truck is at the alignment shop, and fan stays on low. I let it idle up to temp and the fan never kicked up to high speed
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Old 06-13-2014, 10:29 PM
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Fan will not kick into to high unless temps get over set point for a predetermined time by ecm. This can be adjusted by a good tuner .
Unless you are seeing temp way over 210 to 220 on a stock tune it will always be low speed .The speed of fan is adjusted through a coil that proportions the flow of oil ,it is not a high or low voltage switch .The voltage to coil is increased allowing the valve to open to let more flow through
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Old 06-13-2014, 10:33 PM
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Just because a/c is on does not determine whether the fan is on high or low.
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Old 06-13-2014, 11:50 PM
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You can very much have air in your lines as well as when replacing lines fan module drains fluid.
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Old 06-14-2014, 12:33 AM
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The Hydraulic Fan IS NOT A TWO SPEED. It technically has well over 100 speeds, and is Duty Cycle controlled.

The fan does NOT kick to "High" when the A/C turns on like the Electric Fan cars. The fan will remain Duty Cycle controlled with the same fan target, but with a slightly altered routine. Fan speed is directly proportional to the difference between fan target temp and actual temp.
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Old 06-14-2014, 04:27 AM
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We'll thanks for the input. It gives me a better idea what's going on. So the fan can be air bound but have the P/S work ok then?
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Old 06-14-2014, 05:18 AM
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Fan will not kick into to high unless temps get over set point for a predetermined time by ecm. This can be adjusted by a good tuner .
Unless you are seeing temp way over 210 to 220 on a stock tune it will always be low speed .The speed of fan is adjusted through a coil that proportions the flow of oil ,it is not a high or low voltage switch .The voltage to coil is increased allowing the valve to open to let more flow through
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Old 06-14-2014, 07:54 AM
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We'll thanks for the input. It gives me a better idea what's going on. So the fan can be air bound but have the P/S work ok then?
If your fan is running on low speed and the engine is not overheating then your fine .
What is your temps once it is warmed up????
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