Prostar ac

[Rawze]

It is 99% always the thermisters. You are taking it to morons and crooks! - Plain and simple, and if you spent that much, then you are only being a gullable fool!.

The programming in the cab controller on a prostar is designed to suck the money out of you at the stealershits nonstop for the A/C on a prostar! -- You are caught squarely in its grip!.

YOu have 2 solutions ...
1) learn how to replace the thermistors and service it yourself, keeping after it

,... or if you like to tinker with Arduino and are a crazy lunatic that can't leave s%it alone like me ...

2) bypass the crap s%$it cab controller and put an Arduino on it to control it yourself. Here is the one I made for mine...
   

Here is the hookup diagram...
   

The parts that I happened to have used ...
The pro micro: https://amzn.to/2VcoBHl
Relay Module: https://amzn.to/2URvUiE
Voltage converter: https://amzn.to/2JdnHTG
Temp Sensor I used: https://amzn.to/2H0h8T7



I used my 3d printer to make a nice holder, but a person could also just hot-glue the boards to the backing of a clip-board that has been cut down, and use a terminal strip at its edge ( https://amzn.to/2Vf8gll )for the connections.

* I used a long piece of small 3-conductor wire for the temp sensor that I mounted against the evaporator (the core in the cab of the truck that gets cold). I had to seal the temp sensor from moisture really well for it not to get erratic readings. I just buried it and the soldered wire connection in clear silicone and let it dry. I also used the silicone to also glue it to the evaporator core near the bottom left of it.

* I had to turn the "constant current" adjustment screw on the voltage converter all the way up to max, and i had to adjust the "voltage" adjustment screw on it for +5.0 Volts DC using a volt meter.

Here is the code I am currently running it with. I wrote it myself... Use at own risk! -- Seems to work very well for me, even better than the factory. It will not shut down or fault out unless there is no pressure in the system.

Code:

raw code: https://gist.githubusercontent.com/Rawze...C_v02a.ino

and for anyone looking for the wiring diagram for the truck, here it is as a reference: http://bodybuilder.navistar.com/General/...s08339.pdf

and an update dated 08-18-2020: http://rawze.com/forums/showthread.php?t...1#pid57281