Message d'origine par : hvacjack ,
Look for a tag some where. Look for R 22 or R12 and a weight. 1975 is not that old. Get numbers from compressor. Does it need a heat source to heat a tank? Post pics please. Could be activated carbon/Methanol pair is chosen as Adsorbent/Refrigerant pair if it is an absorption system. Need pics. Cold is the absence of heat.