[Kuhlmankevin]

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?

 

[Kuhlmankevin]

So, I changed the EOT sensor. That seems to have taken care of it. Watching the temp on the tuner, it never wavered, but a cheap easy thing to try. Thank you for your input!

 

[Kuhlmankevin]

And what is wrong with the A/C pressure switch?

I read somewhere that the high pressure can make it cycle. So the high pressure switch is an easy one to swap.