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 - Oliver 550 Purchaser Checklist - by Greg Sheppard. Pound for pound the 550 is better than anything I've seen. It has great power for its size and can really hunker down and lug. Classified as a 3-bottom plow depending on soil conditions. I personally don't think it can be beat for a utility tractor in the 40 HP range. They are extremely thrifty on fuel, at least my DSL is. Most drive train parts are fairly easy to get. Sheet metal is probably the hardest thing to
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