60 Series Detroit AC doesn’t work

Could be a short in the wiring, or a bad compressor. Check your AC fuse in the glovebox too!

 

So this is like a $7-$12 part. Went bad on my FLD few months ago. It's a low air switch that keeps the ac compressor from turning on till it sees X amount of air psi. Needs to see air psi so it knows it can activate the engine fan to blow air across the condenser..

Worth a shot to swap it out for just a few bucks..

Edit: When you say ac don't work at all, do you mean blower motor, like no fan or nothing..?

 

I am not a ac tech. But if its charged and ready. With my truck engine off, and the ac switch on, and the blower fan on for the cab. I cycle the ignition switch and i can hear the ac compressor clutch click on and off.

 

I don't have a Coronado, but a '93 FLD120. It is a series 60 powered tractor though..

1st, check the ground wire, & all connectors right at the ac compressor to make sure nothing is loose, & all is connected properly.

So my low air switch is located behind the dash. Took out the dash cover right in front of the gearshift stick in the center of the cab. There is an air manifold right there with a few air lines going into it, & the pressure switch that looks like the one I posted above..

There will probably be a few, for low air alarm, parking brake, etc. Might need a wiring diagram to find the correct one.? Or pull off the 2 wires & see what stops working..

Also the high/low switch on the air drier would be the next thing, I'd check.. Air drier is on the firewall, ditch side, or have seen some on the frame rail by the steer tire. Drier looks like this. Switch on top. Make sure is connected, & not corroded. Maybe replace that too.?

 

Wait, so the ac light, or snowflake symbol is illuminated?
But the compressor still doesn't spin.? Like the ac clutch won't engage..

 

Thats why i kinda wanted to establish that the compressor clutch was even clicking on.

 

10-4 Sir! I got it now. Key on, sends power, listen for the magnet click.
Yep, I might had been getting a head of myself. I'm no ac expert diagnoser. LoL Just had a few quick fixes myself & thought they might work for this fella.

If the ac light is on/illuminated, yet compressor clutch not engaging I'm lost..