Judging by this write up it appears that Envirsafe has a ignition temp of 1585 F at both 5 PSI and 0. Take a look....

http://www.autorefrigerants.com/Envirotechnical.htm

In gasoline engines you have large fuel rails filled with pressurized gasoline,so that seems more dangerous than some Envirosafe.

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1985 300TD Turbo Euro-wagon
1979 280CE 225,200 miles
1985 300D Turbo 264,000 miles
1976 240D 190,000 miles
1979 300TD 220,000

GONE but not forgotten
1976 300D 195,300 miles
1983 300D Turbo 175,000 miles

http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg

I doubt that this will happen to anyone in my lifetime, but how about a stone piercing the condenser, right next to the engine intake? That might be fun...

As for 134a being flammable, well, yes it is, but you'll never notice. It cannot burn unless it is combined with air at higher than ambient pressure. The oil is another story entirely. And refrigerant hitting other burning stuff in the car could break down into some rather nasty chemicals.

The potential for problems with HC refrigerants are not in the condenser. A leak there is unlikely to cause trouble, even in a wreck. There is so little of the stuff in there. The problem is if the evaporator leaks and propane mixes in the air inside the car, potentially causing an explosive atmosphere. There's a video online showing some HC sellers showing how safe it is -- until they do explode the car, bending the window frames out. Evaporator leaks are not exactly rare.

Is that pressurized gasoline in front of the radiator ?

I am sure you are just being contrary... because it would take a real idiot to not understand the concept of ' UNNECESSARY RISK'...and I am sure you are not a real idiot....

That gasoline is also required for the car to GO...

There are safe and effective refrigerants to use instead of the hydrocarbons and blends....which by the way, also make your car serviceable by any local or perhaps more important... far away AC shop... meaning if you have AC troubles on a trip you are not up a creek by having some junk installed in your system.

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1980 240d ,

chain elongation, cam marks reference:
http://www.peachparts.com/shopforum/showthread.php?threadid=10414

http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html

evap fin cleaning:

http://www.peachparts.com/shopforum/showthread.php?t=156207&highlight=evaporator

A/C thread

http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html

Well, I think my question is answered, thanks again 79Merc, so I guess let the hydrocarbon refrigerant war begin......

If there was a leak at the engine intake, all it would do is give your car a good little boost - ive wanted to try propane injection anyway to give the 240D a little boost

In RE to unnecessary risks, there is a lot that can be said about that. Any time you get in a car period, you are taking a risk. To avoid unnecessary risks, walk. If you must drive, then get a brand new car with all the new safety equipment. Think of the 240D, there is no airbags, and while it has a very strong frame, "new" cars are made to a much higher safety standard.

ANY refrigerant has dangers. Health, environmental, safety.... all have their own issues. I dont smoke, so I am not worried about sparks in the cabin - if I get in an accident (front end), and it is an accident that causes both a leak in the refrigerant lines AND there is a spark or fire big enough to actually ignite the refrigerant, then I will be more concerned about the accident I just had.

Further, I keep many other explosive things in my car all the time anyway - for example how bout my can of either to start the car in case of emergency (yes I know I need to have my glow plugs off to use it)? That would cause quite a boom as well.

R134A sucks for Phoenix Arizona weather, period in these cars. Hydrocarbon refrigerants do a very good job of cooling me off in the summer. R12 is not an option because I am not willing to drain the oil in the system, get a license, obtain the R12, and refill just because I am afraid of an accident.

As far as anyone else working on my system, ill probably own the car till either I die or it dies. Maybe we will both die at the same time in an accident caused by my AC blowing up

I completely respect and thank those who care about my safety. I certainly think that if someone is doing something that is potentially dangerous, the right thing would be to warn them - especially if they are not aware of dangers.

Leathermang, you have helped me out on other posts I have done and appreciate your advice and experience.

I am aware of the potential issues with doing what I am doing. Inst that where the comments about the refrigerant I am using should end? I thought I clearly said something about that in my original post.....

Its like religion. Everyone has their own opinions about which one is right. Your more than welcome to tell me about your religion but if I dont pick yours dont start telling me how I am going to go to hell......