Don't do it.It's illegal and then you will not get an ac shop to touch it. Check to see if compresser starts if not you may be low on freon,Bad relay,blown fuse .Take one of the caps off and depress the valve just like a tire valve if there is pressure you will hear a hiss and may just need a top off could be lucky and just have a blown fuse . Hope this helps !!!!

 

It is against the law to mix any kind of refridgerant. Either way, you need to have your system evacuated and then you can convert to R-134a by buying a conversion kit, or what I would recommend, is getting some freeze 12 (google it and you can find their website) which is a direct R-12 replacement. It should give you better performance than a R-134a conversion. Hope that helps.

 

Don't do it.It's illegal and then you will not get an ac shop to touch it. Check to see if compresser starts if not you may be low on freon,Bad relay,blown fuse .Take one of the caps off and depress the valve just like a tire valve if there is pressure you will hear a hiss and may just need a top off could be lucky and just have a blown fuse . Hope this helps !!!!

Do not depress the valve on the high side.

 

If compresser is not running it will be same pressure on either side (static pressure)

 

My system was empty...and my compressor would squeal when I turned it on. I bought the R-134A kit you mention from Wal Mart and put the proper nipples on the high and low pressure lines. I then put the can with the compressor oil in first.. the squeal from the compressor immediately stopped. I then filled the system with the rest of the freon as described in the instructions. That was 3 years ago....and all I've ever done is partially re-fill the system with not even a half a can of freon per year and my system has worked fine.

 

Oh and another question is that when I turn on any of the heater/ac controls air blows out of the defroster on all settings. Does any one know if this is normal?

 

I think a little bit of air "leakage" is normal.

 

It is against the law to mix any kind of refridgerant. Either way, you need to have your system evacuated and then you can convert to R-134a by buying a conversion kit, or what I would recommend, is getting some freeze 12 (google it and you can find their website) which is a direct R-12 replacement. It should give you better performance than a R-134a conversion. Hope that helps.

do you need to buy the Freeze 12 conversion kit also or just the can? It looks like if you have the old R-12 A/C, that you need to buy a conversion kit which then makes your system a Freeze 12 A/C....this is def. cheaper then converting to R-134 or whatever....

 

do you need to buy the Freeze 12 conversion kit also or just the can? It looks like if you have the old R-12 A/C, that you need to buy a conversion kit which then makes your system a Freeze 12 A/C....this is def. cheaper then converting to R-134 or whatever....

Freeze-12 also uses different connectors than R-12, whether or not they are different from R-134a, I don't know. I know one reason for making different ones is to keep people/mechanics from mixing refridgerants. If you have not done an R-134a conversion, yes, you need to buy the Freeze-12 conversion kit. If you have done an R-134a conversion, I'd look into if the Freeze-12 conversion is any different.

 

On my 1986 what is the part called where the sight glass is cause I cant find it to buy it?

 

I dont know much about the ac system, but what will happen if I put a can of R-134a from wal-mart in my system? As far as I know it is still R-12 but I am not sure all I know is that it is empty and the sightglass doesnt show anything. Thanks for all your help.

Even if your R-12 is totally empty, you should not put a R-134A can into your system until it is retrofitted for R-134A. The two regfrigerants use different types of compressor oil, so popping in a straight can of R-134A before getting the old oil out and putting new oil in (part of the retrofit process) will damage your compressor.