Here we have a manufacturer that has been equipping its vehicles with hydocarbon refrigerants:

http://www.hydrocarbons21.com/content/articles/2010-12-09-world-s-first-oem-chooses-hc-refrigerant-for-vehicles.php No one got hurt

Here we have a comprehensive scientific assessment of usage and risk of hydrocarbon refrigerants in vehicles: http://www.hychill.com.au/pdf/usage_risk_mvac.pdf

"The actual accident frequency and hence risk of using hydrocarbon refrigerant
in motor cars is much lower than predicted when commercial use commenced."

Here's the famous porsche 928 sliced refrigerant hose underhood episode, the perennial favourite trotted out by HC fearmongers : http://www.youtube.com/watch?v=k0K1WPCWm2k Yes it burns.

And here's the video of researchers blowing themselves up in simulated worse case scenario - emptying HC refrigerant straight from the can into the passenger compartment and lighting it with an open flame:

http://www.youtube.com/watch?v=k0K1WPCWm2k

Yes it explodes as do gasoline (what most cars in the US run on)vapors.

Hope this serves as an antidote to the hand-wringing pontifications of armchair doomsday hypothesizers long on talk short on fact i.e. real world evidence.

__________________
'83 SD, 2x '85 SD
You are entitled to your own opinions, you are not entitled to your own facts.