My FJ60 doesn't Have A/C

[FL cruiser]

Why? what does it do? I don't want to make more work for myself than I need to, and This 60 will only see Colorado summers and sometimes Utah desert.

I know I'm probably leaving some other minor function out, but It turns off the compressor when the engine RPM's drop below a set RPM. It has a knob where you can adjust the RPM threshold. I think the lowest it can be set is 750 RPM. So if your truck idles below 750 RPM, and you're at a really long traffic light, the compressor is off and the temp of the air out of the vents will go up.

I think it's unnecessary because I would think the 2F is powerful enough not to drop that many RPM's at idle with the compressor load and shake and idle rough. Maybe a good idea for a vehicle with a 4 cyl 20R.
I would think the thermistor could be eliminated too. I don't think the 60 evaporator would ever get cold enough to ice up. Maybe if someone operates it below 65 degrees.


Just finished up the conversion. It does blow colder. I was hoping for 43 degrees, but am now getting 48 degrees at the vents with R134A. I guess I should be satisfied and not mess with it anymore.
Before in stock form, all I could get was 56 degrees with R134A and 54 degrees with R12.
It's debatable if all the work was worth it for a few degrees. But hopefully it will now be more reliable.
In 5 years, replace two crappy GM Delphi compressors, two evaporators, one expansion valve, plus desicant bags broke in two driers necessitating removal and cleaning of exp valves. This time installed a Denso drier instead of using an Advance auto Parts chinese one.

 

[5280Hawk]

A few more questions.

Where does the AC button on the Dash come into play? I don't have one but the little hole is there where it would go. I will get the switch off a parts truck, so I guess I can figure out where it connects that way.


So the Idle up solenoid increases the idle speed when the AC is on?

But the A/C Amplifier cuts the compressor if you drop below a certain RPM?


And if i elect not install either one, I would be looking at the only control of the system would be the on/off switch at the dash, correct? If it would work, it sounds much simpler that way.




FL Cruiser, I may be hitting you up for advice when the time comes, as you certainly know your AC. Thanks man.

 

[FL cruiser]

Correct, correct.

And if i elect not install either one, I would be looking at the only control of the system would be the on/off switch at the dash, correct? If it would work, it sounds much simpler that way.

Correct. It should work fine that way.
A pressure switch in line between your on/off switch and compressor would be good for compressor safety. If there is no pressure in the system or refrigerant leaks out, which also means no lubricant , and someone turns on the A/C switch, the compressor running dry could lock up or destroy itself if left on. On the stock evaporator output line there is a pressure switch with contacts for two wires that could be used, or pressure switch could be put anywhere.
Or the pressure switch could be skipped if you're the only one driving the vehicle.