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How to troubleshoot and charge a warm blowing A/C system on a Caterpillar 740 Articulated rock truck. this is the exact same system as a Cat 735 and very similar to most Caterpillar machines. Remember do not release Freon into the air because in the 1990's they told us that it made a big ol' hole in the atmosphere, that was before they invented global warming, and it is illegal to release it, even though if we did release enough of it could it possible reopen the (imaginary) hole in the Ozone layer and let all of the excess heat out, fixing global warming???. So there you have been warned. Also do not breath in R134a as it is very poisonous... Breath enough and you will puke your guts out for about 6 hours (ask me how I know). Breath enough and it can be fatal.