KC95SC400

iTrader: (3)

Well put. Dont forget to charge with the 154 to 80% of the r12 capacity. If the system holds 2 lbs of r12 charge with 1.6 lbs of 134.

FYI...I'm pretty sure that's a Fedral offense equaling jail time and some very hefty fines.

KC

1sxyrxy

i have done my dads corrado all i did was replace the reciver dryer and all the o rings. sense r134 runs at higher pressures the propper way is to get a bigger condensor and evaperator but you dont really have to. i have access to a ac machine so it wasnt that big of a deal. just do all the work your self and go to a place and have them charger it and tell them you have converted it. not a big deal. my dads car blows 40 degrees at idle and even colder while driving

kyoso23

Thanks for pointing that out, it was certainly not on purpose (each time)I just assumed since it was not running cold that it was empty, so there was nothing to leak out.

SC300_704

iTrader: (5)

i've converted to r-134a in my SC and is running w/o any problems at all, a lot colder than before...

lexdud

Please elaborate as to how you did it and the costs involved.


Thanks ...

twizted

iTrader: (2)

I would just look into fr12 also known as freeze 12 or r416a. They are both direct replacement...

lexdud

Do you have to evacuate the system before you add the direct replacement refrigerants or can you just add them to the system?

Thanks ...

twizted

iTrader: (2)

You "can" just add it to the existing system. Chances are though you adding cuz you have a pretty good leak. Check and see if you low side is putting out 10 units or less during idle. If so there is going to be air in the system and you need to evacuate. Chances are you need to add oil at this point and you have to do that first before putting any refrigerant in.

SC400DAVE

I've doon it on two other cars of mine. No problems and it works just as good! Just make sure the system is evacuated of R-12, change the fill valves and you are all set.

lexdud

I just called a local shop and got a quote of $170 to convert to R-134a. They really didn't go into too much detail as to how they convert EXCEPT to tell me that they did not have a machine to extract the R-12. To ge tthe R-12 out they simply release it to the atmosphere. I was told this is highly illegal (a felony).

SC400DAVE

I did it myself. The R-12 was already gone because of a leak in one of the valves. I believe any reputable shop would have one because like you said it is illegal to just vent the R-12 into the atmosphere on purpose. Find another shop!

sc250tt

Are you guys even adding oil when re gasing the system? The proper way to do it will include replacing drier, o rings and what not ,then you have to vacuume it andd oil and after that then you add freon. Failure to do this will cause the system to get contaminated and parts will start to fail.

SC400DAVE

I just changed the valves and recharged it with what was in the kit, which if I remember included the oil. It lasted for years with no problems.

pinto096

let me chim in here, first auto zones kit wont work the low side valve is too large you will only be able to adapt the high side not recommended unles you shoot the freon in small tiny burst and you will need a high pressure guage up to 300 psi or more. the correct kit for the nippondenso compressor is called READY AIRE THEY MAKE 3 KITS ONE WITH OIL ONE WITHOUT ETC. summit has the valves any other kit wont be able to work on the low side,if you vacumm it completely you will mneed the correct oil. if you put it in an empty system you can use the neutralizing oil wich cancels the old oil and allows for the newer oil for the 134, included in the kit, my recommendation is as follows, remove compressor, fir it with new seals kit can be bought at ac store compressor seal kit comes with all o rings and seals, change dryer, be carefull the dryer holes are diffferent on some of the dryers better to take yours out and match it at the store also replace those o rings ,forgot to mention remove freon first from system use vacuum, drain compressor oil, clean compressor so when you put it back will make it easier to see any leaks, once everything is back together again vacuum the system best way is to keep vacuum overnight but most cases this cant be done because of lack of equipment also after vacuum put dye in and fill system with nitrogen dosent harm syste and cakn be released in the air after leak test, when you determine that it is not leaking, hook up low side and fill with 134a while ac is on and car is running, r12 compressor uses a low pressure system 134 uses a high system, so it wont get as nearly as cold but it will be satisfying, different opinions on the feel of coldness, no 2 the same, easier way if your system is tight the r-12 replacement without mods s called FREEZE 12. put it in and go the secret to it all is no leaks and correct high and low pressures i think 250-300 or more high side 250 to be safe low side 40-45 psi not sure check with lexus or an ac spec book, this is just my expierience with the change over still working on it cant find a leak suspect its in the compressor waiting for another one will update when done

cbrasian

ok so heres the thing the fitting kits work you pretty much need to evacuate the system and place the new fittings on high side and low side then recharge it and your good to go doesn't work as great but it works enough.