HELP: A/C, trans temp, fuel pressure
 

Ok my Ac blows cold in every position but if it's in a lower position sometimes the fan will speed up so to speak then go back down to original setting any suggestions?

Next my trans seems to be running a little but hotter 180-185* on my glowshift gauge
I can't get a reading from my SCT HANDHELD (it said invalid)

And finally ive noticed my fuel pressure drop from 60-62 psi at idle to about 52 psi idle and drops to 46-48 psi WOT again on my glowshift gauge
(could this be caused my farm diesel)
Any advice to fixing fuel pressure

Mods:
Egr delete
New oil cooler
Sct with extreme street tune
Arp head studs
Gaskets

Fuel pressure is a known isssue, there is an updated spring for the fuel regulator that is located on the front of the filter housing on top of the engine. You can get just the spring, they also sell it in a kit with new cover and is alot more exspensive.

a/c will do that if you have a leaking vacume numatic line

Just saying... I highly dislike glowshift gauges.

Trans in these typically runs like 90* hotter than ambient temp. No matter what. 185* is not hot at all. I don't think the thermostat in the trans even opens until around there.

Get the blue spring like Bob said, the P/N has been posted numerous times here.

What's the difference between your farm diesel and pump diesel? Nothing other than taxes. I used to run offroad a few years ago when I was east of where I am now. One station sold it at the pump... it was pretty nice.