AC connection size?

[cruisernerd]

Hi, does anyone know what size the connections are, for the pressure ports on the AC compressor? I hope to know before trying to source them. Google didn't know, and mud search turned up nothing. Also does anyone know the size of the charge? And I believe the refrigerant to be R-12, is this correct? The truck is a 1990 hdt 80.
Thanks.

 

[inkpot]

Yes you should be running R-12, unless someone previously converted it to 134 . Ports are standard sizes, different for. 134 and R12

 

[e9999]

the ports are also different sizes for the hi and lo sides. And quick disconnects on mine. Yes, in the US at least, should be standard. Would not know for Canuxico, sorry. There is also normally in California at least a sticker under the hood with the refrigerant stated. Lots of adapters to be had for those things, to go to standard HVAC shraeder valves hoses etc.

 

[1972FJ55]

If it's still R12, the ports will be threaded, 1/4" male flare for the low side and if you compare the high side size to the low side size, it will either be the same 1/4 MF or if it's slightly smaller, then it's 3/16" male flare. If it's been converted to R134a, it will have quick disconnect (smooth sides-no threads) screwed over the existing R12 ports.

 

[cruisernerd]

I found a hose adapter, it's 3/16". I don't have a wiring diagram, but does anyone know if there is a low pressure switch, that stops the compressor from running when the charge is low?

 

[1972FJ55]

There's a trinary switch located by the battery that will shut down the system if the pressure is to high or low. The computer also will shut off the compressor if the engine temp is to hot.

 

[cruisernerd]

Do you most guys weigh in the charge? Or charge my measuring superheat? Anyone how much R-12 is required?
With AC I usually shoot for around 15-20 degrees F superheat, but I've never done auto AC before, and wonder if the console cooler/ice maker effects this.

 

[e9999]

since I never actually emptied the system totally, there never was any point in weighing what I put in, I just filled until the pressure on the low side was in the appropriate range. Worked so far. Admittedly it's a crapshoot with oil charge though.

 

[Brunorelli]

I was told we can no longer get r-12 in ca. Can anyone direct me to how to convert to r-134?

 

[LandCruisinMy93]

I was told we can no longer get r-12 in ca. Can anyone direct me to how to convert to r-134?

You can buy the conversion fittings that screw into your line ports at most auto parts stores. However it should be noted that the AC drier for the r12 system is supposedly incompatible with r134 and that is one reason there is a seperate drier for the r134 system. A true conversion would require a newer style condesor core and the line coming from the newer style drier. To forgo this, I personally changed my drier with the r-12 drier, added ester oil vacuumed it down for 2 days and charged my previously empty system with dust off using a r12 can clamp style can tap. On a 90 degree day the thermometer in the vent reads around 24-28 degrees Fahrenheit idling. Definitely not telling people to do this, but it has been done by numerous people and has worked well for me personally for the 2 years I've had my cruiser. Once again, not recommending this, just something I've done personally, and you can argue all day how it is a bomb but that just makes you ignorant and I won't my waist time justifying it to you.

 

[Brunorelli]

Thanks. You charged your system with dust off? 24-28f wow that would be frickin awesome