Crazy idea time.

Time to redo my A/C system, Florida's heat can be brutal.

-Has anyone thought of or used propane as a refrigerant in their MBZ Diesel?

-What are the potential gains or losses from this conversion?

-Can "off the shelf" propane be used?

-How does it hold up in comparison (cooling) to R134a? R12?

-What kind of oil must be used?

The potential for a runaway if there is a system dump is startling. When my 134a charge blew, it dumped right into my intake (oops) and gave me a bit of a scare. But only raised the idle to about 1,100RPM.

Discuss!

__________________
Vehicles:
2002 SLK 230
Gone but not forgotten:
1983 300D
1981 El Camino 'OILBRNR' - 6.2L diesel
OM617 powered '86 F150
1984 BMW 524td
2001 VW Beetle TDI
1994 Sunurban 4x4 6.5L diesel