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Cooling fan started coming on frequently. It comes on full speed, doesn't matter if I am going 20mph or 60mph. Comes on for a mintue, then shuts off. It is cold outside (25°F) and engine/Trans temps are low end of normal. Seems to do it a lot more when the defrost is on, working the AC compressor. Waiting for a AC high pressure line sensor. Engine was recently replaced, runs like a dream. No codes on the tuner. Anyone have any other suggestions?
 

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Are you able to monitor as you drive/data log? Watch trans temp, ect, and eot when it happens. The trans temp sensor is really common to fail and thats one of the early signs, eventually it will throw a code/wrench. You may even see the gauge max out on the dash when it happens.

Not 100% your issue, but its something to watch.
 

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Cooling fan started coming on frequently. It comes on full speed, doesn't matter if I am going 20mph or 60mph. Comes on for a mintue, then shuts off. It is cold outside (25°F) and engine/Trans temps are low end of normal. Seems to do it a lot more when the defrost is on, working the AC compressor. Waiting for a AC high pressure line sensor. Engine was recently replaced, runs like a dream. No codes on the tuner. Anyone have any other suggestions?
And what is wrong with the A/C pressure switch?
 
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