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I'm converting to 134a on 68 Shelby w/ all new components (orignial style comp) and can't get blowing air temp below 65 F. Pressures are good and we put in 1 1/4 lb of 134 as per recommendation from Classic Air (R12 charge was to be 1 3/4lb). Any thoughts? Thanks,
 

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Mount a small fan on the external exchanger, that will drop the presure and increase the coldness inside.

Jeff
Member: Flatheads ain't so bad association
Never trust an over 40 Chevy owner association (They have to cheat to win)
 

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I'm an HVAC/Refrigeration mechanic. If all the components are functioning,then the lack of 134A is the reason for the
high supply air temp. Using those hoses on the "hand grenade" cans is useless. Here's a tip. Put 134A into the system,with the car running and the AC on and watch the suction line of the compressor. The suction line is the line that will be cold to the touch. When that line starts to display condensation on the metal parts of the hose,then the charge is good. Of course the best way to add 134A is to use a manifold gauge set that has a compound gauge with the operating temps of 134A on it. Good luck
 

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Also dont forget that under the best conditions you will get a 25 degree drop from the outside air to the inside. So if your outside air is 90 degrees the best you should show is 65 degrees.....good luck
 
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