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From: Hank Dozier
Remote Name: 18.104.22.168
Date: May 03, 2002
Can.....I cannot agree more about some of these methane gas based refrigerents! They are BAD news, and for a variety of reasons. First, is the explosive characteristics of them. Second, they do not have very good Joule-Thompson coefficients (the ability to exchange energy when expanded across an orifice), which is the premise which makes pressure exchange refrigeration systems work in the first place. Third, they can react with the oils and form sludge compounds in the ssytems. Forth, they absorb water, and when methane and water combine, methanol (wood alcohol) is formed, which then reacts with the seals and aluminum in the system and corrodes both, causing leaks! Best is sticking with either R-12, the new HC-134a, and doing a first-class insulation of the vehicle, including solar tinting of the glass.