'91 FJ80 AC Recharge (R12)

[SteveH]

Note: if your system still has pressure in it and produces some cold air, you don't need to evacuate it to add R-12. Just purge the lines with a little R12 as you connect them, and add the needed refrigerant.

 

[Toekneesan]

Sorry to ask you a question that doesn't have anything to do with your ac, but I was wondering. Does your fj80 get really hot undnerneath your driver side floor panel. Not sure if it's the cat that's causing it, but it did pass smog. Plus I notice when it gets to hot my stereo fuse pops every time.

I was reading about the A/C and saw you asked about the heat radiating from the floor board and on my 1991 FJ80 3FE Toyota Land Cruiser it radiates from the floor in the entire cab. I took the temp with my laser thermometer after driving, it was 119°, I could barely stand it. I want and bought a roll of that silver insulation and laid that all under the carpet shifter box and also under and up inside the console, never took a shot inside that but you I could definently defrosted a meal in there for sure. Its helped somewhat, dropped the temp down to around 90°. The heat shields are all there so I didnt know what else to do. Searched the web for a mastic or something like that to apply to the floor but didn't come up with anything.
It's been a while since you asked the question, did you ever fix your problem? Thanks

 

[Nikofzj80]

@BDA130
I'm running 134 on my 1HDT, that originally had R12. Feels nice and cold to me and cost just over $200 for the conversion and refill at a local shop.

What does the conversion consists of? Any hardware?
What happens if you charge an R12 system with R134? Im afraid they have done that accidentally on my truck

 

[Vasiliy]

What does the conversion consists of? Any hardware?
What happens if you charge an R12 system with R134? Im afraid they have done that accidentally on my truck

r12 - r134 Compressor oil is incompatible, cannot be mixed.

Important: You must flush the entire system of old oil for conversion.
Ideally: replace the expansion valve too (because it may operate at a different pressure) and recommended old seals(o-rings) which may be incompatible with oil and r134 freon

 

[kekione]

I was looking to convert my r12 system to r134, but I found a replacement gas for the r12, and didn’t need to do the conversion.

It’s called Freon MO49 plus

After checking my system was leak free, proceeded to recharge with this gas, and now it’s ice cold again!