The reason that propane /butane refrigerant is much more dangerous than engine fuel system fires, is that the flamible refrigerant has direct access to the inside of the cab through the AC vents. A leaking / ruptured evaporator will release hot liquid propane inside the cab that will expand aprox 200 times into highly explosive / flamible vapor that quickly fills the cab. Sparks from the brush type AC blower motor is a perfect ignition source to light off the propane vapor.
Why risk that kind of danger when R134a is legal, cheap, avalible anywhere and it works.
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Today's Featured Article - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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