To start with it will be high vacuum reading as suction is low pressure
secondly it means that the system is vacant of any gas and is well below 0 psi
if it is a high discharge pressure ( after the ac compressor) it means that the condenser is not being cooled by the fan or you have excessive gas in the system or the tx valve is blocked
I strongly suggest that you seek the services of an accredited ac specialist shop as r134a gas runs at a lot higher pressure that the r12 or r22 gas before you do serious damage to the ac compressor and system
SOURCE: How do I convert or fill 92 Jeep Cherokee air conditioning freon?
If it leaks 134 it will leak R-12 .I have changed hundreds of systems over to 134 without any complaints. Don't let the 94% eff rating of 134a scare you because that does not mean that your ac system will lose 6% cooling ability .A large class 8 truck or maybe a high roof van black on black and poor insulation might tax the system in the 90% range on 100 degree days but most systems never get close .
134a high side pressure will be about 18% higher so most systems you need to change the high side cutout.The R-12 electric fan switch will be ok just make sure it is engageing the fan when the pressure comes up.You must check the condensor in front of radiator to make sure air flows easily thru it.On systems where the hoses screw on each side of the dryer I replace the dryer .Drain oil from compressor and replace with 134a oil .Replace that bad valve core (with ac valve core not a tire valve) Now very very important vaccum the system and if no loss of vaccum in 20 min charge with manufactors recomended amount of oil and freon.If a system is low on freon (cycling in & out on low pressure switch) you can add a pound of charge with those small cans of same type freon no problem but when there is a leak and the charge has been lost or changing freon types you must pull a vaccum to properlly charge the system. If you just charge R-12 or 134a your system will have traped non -condensables and a large drop in cooling ability. Hope this helps. Harold
SOURCE: what type freon is used? Which access is high side & low side?
this feron is used
R-134 Refrigrant.
thanks.
SOURCE: I have a 1998 grand prix using 134a freon i
some generalmotors cars you had to use an adapter which you can get at most automotive stores like autozone you screw it on over the smaller unit and you leave it there then you can fill it
SOURCE: AC has freon (134a) pressure is good. Compressor
Have a code reader or scanner put on the car to erase all codes,this should reset the ac system circuit.Also check the low side clutch cycle switch,it may be the problem.
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