Posted by Tiger Joe on April 21, 2016 at 10:42:20 from (205.254.147.8):
In Reply to: R 134A Freon posted by popinjohn on April 21, 2016 at 08:38:02:
yes somewhere on the AC system the tag should be there with the specs. but it could be lost. mine was not on my truck.
high and low pressures both vary based on air temp. However, 12 psi is way too low for low side.
@ 70 degrees you probably want ~35 low, somewhere around 150 high I think.
Also, if you are filling with small 12oz cans you NEVER get the full can into the system. I believe they say knock 1 oz off.
Also are you checking at idle or with the RPMs slightly elevated? AC system are not designed to work their best at idle, so you should take pressure readings around like 12-1500 rpms.
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