I have my brother in laws 15 Ecodiesel, doing some work on it after the stealership really screwed things up. Long story short, went to dealer 2 years ago to get broken glow plugs removed (an independent mechanic broke 5 out of 6 off in the heads plus an extractor tool) and he got it back in May of this year with a new engine. A/C hasn't worked since he got it back. Said dealer told him it needs a compressor but when I got a hold of it there was no R1234YF on the system. I leak checked and then charged system by hot wiring compressor. Cools great just doesn't kick engine fan on. So with everything hooked up properly, there is no power to F62 in tipm. I get a full 12 volts and compressor and engine fans kick on for about 5 seconds upon first start up but then back to nothing. I have taken time loose and checked connections, cleaned some body grounds and even swapped a rebuilt tipm ( from MAKS) with the same results. Checked power on light blue wire with red tracer for a/c signal from pcm to tipm and its good at 14 volts when running. I am at my whits end and so is my brother in law. I hope someone can shed some light on this for me. Thanks in advance!