This past weekend, I did the changeover from R-12 to R134a for the AC on my car. Everything was fine all weekend, nice cold A/C, no problems.

Today I was sitting at a light and I heard a sound like someone was purging nitrous.

Any idea what this might be? Did I overfill the A/C?

 

Does the AC still work?

 

Not + I dropped the car off and took the truck to work instead, seemed to still work though

 

Did you run a good vacuum and regharge on the vehicle?

 

its purging as a safety device called either a high or low side pressure relief valve... something in your ac system is not working correctly. If this is on a ford check your compressor for good operation, make sure there is no clogs in the lines and everything electrically with the ac is in good operation (a/c cycling switch, etc, etc)

 

Also you may have to run a dignostics on it as well. Could also be an electrical problem as well. Good thing you converted, R12 is expensive.

 

sounds like you just over charged it a little bit. should be just fine

 

that might be possible as well, if overcharged the system will create exxessive pressure and be released into the atmosphere