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Air conditioning

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Have not seen many postings on a/c's. When switching over to r134 on a 70 MC, do you need to replace any of the valves (suction,throttling,ect)before recharging with the 134 ? I have not kept up with the switch overs.

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no valve switching , using the r134 is not as bad as once thought.a company called interdynamics has a excellant web site on the switch over. gene

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I had an airconditioning guy purge my old freon out and install the R134. He didn't change anything else in the system. That was over two years ago and it is still working great. Many people feel some components must be changed out for the R134 to work. Mine is a 1970 and with no other components changed out works fine with all the original equipment.

Rob

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As far as changing to 134, the only thing i have seen is any seal that is borderline will leak. The 134 molecule is smaller then the r12 so it can leak in spots the 12 didn't. Make sure whatever kit you use is approved for AUTOMOTIVE a/c systems. There are alot of kits out there with all knids of stuff in them that are very flamable and will eat the rubber lines and seals over time. Just look on the can and it should say automotive on it somewhere, if it dosen't, choose another brand. Also make sure you use the oil charge that comes with the kit. It conditions the left over mineral oil to work with the pag oil for 134. Most a/c failures are from lack of lubrication. Hope this helps, any other questions just post em

Jim

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I've heard that inside the POA valve (large valve attached to the evaporator case) there is a small set screw that needs to be turned a 1/4 turn counter clockwise to set the pressure correctly for 134A. R12 and 134A operate at different pressures. This procedure is only required if you want max. cooling from 134A.

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