I just cant figure this out . Truck was running fine but leaking freon , so, I put in the dye to find the leakage . I never got a chance , then parked it for 6 months with dye and freon in the system . Picked up the truck after a head rebuilt and head gasket , now , the fan is constantly running . The solenoid whistles when you turn the ignition. just like normal and at that time ,I can also freely spin the fan . I went ahead and changed the temperature sensor by the block and the high low ac switch on the line . When this didnt resolve , I changed the fan switch on the ac dryer thinking it would stop . The fan is still running constantly . I was thinking I had too much freon , so I tried purging the low side , but there is no pressure in the ac line . What do you guys think ? Dryer clogged up ? Quick info , the old fan switch cuts the fan on after 10 minutes of idling but the new fan switch immediately cuts the fan on when I crank up the truck
2003 columbia with 12.7 . Fan constantly running
Discussion in 'Ask An Owner Operator' started by henboy1, Jan 28, 2020.
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Sensor in dryer
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Take air supply off fan solenoid and see if that shuts the fan off.
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I thought the fan solenoid was the cylinder type thing connected to the coolant reservoir?, At least it was in my 2 freight liners......
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This is how mine is. Electrical connection to air solenoid that engages/disengages fan
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