i decided to hook my low side pressure gauge up to the ac system bc the damn thing wont cool.

all other components work. (compressor, fans, etc.)

to begin with i cant put it on without freon spraying everywhere.(first clue)

i get it on and it reads 60psi when i rev the engine it drops down to 25psi so i decided to open a can.

psi flew into the red and i shut the system off immediately and it red 95psi

i believe i found out why the ac wont cool and it bogs the crap out of my engine

system needs to be evacuated. previous owner over filled the system.


i can partly put the gauge on the nozzle and it shoots out gas minus the neon green liquid

can i leave it part open to evacuate it that way instead of renting the gauges from autozone?

 

You may be attaching gauge connector wrong, have a defective connector on gauge set. Hose connector must be pulled back, pushed into place, and released to capture the male connector.

When adding R134a, the low pressure gauge will temporarily read high. You have to cut off the flow to measure pressure correctly. You may not need to discharge.

Because your pressure was initially low, you very likely have a leak somewhere. Have you looked for dirty/oily buildup at connections, around compressor clutch plane, etc? These indicate leaks that should be fixed. You will need to discharge system to repair leaks. Leaks in evaporator are also likely and not possible to detect w/o a senstive refrigerant sniffer.

I would highly recommend a gauge set to perform any operations on the system.

Also suggest going to autoacforum.com for help w/ charging instructions.

good luck