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You charge it at the smaller of the two AC lines from the compressor using a pressure gage, when the low side pressure is at 28-32 PSI the system is charged, I think you are overcharging the system which loads up the engine and causes it to slow down. CHECK THE LOW SIDE PRESSURE!
cant recall on 96 if it is o-rings or gasket but defineitly has a seal that is now leaking. remove line,replace seal and use an evac. pump to pull a vacume on system. If it holds a vacume without leaking it will hold a charge and you wont waste your freon testing. Plus you should always evac. system before charging anyway
Find the ac compressor,and look at the ac lines coming from the ac compressor,then just follow the large ac line until you come to the low side service port,this is where you will connect to,to charge the ac system.If this was at all helpful,please rate,and thank you,
locate your evaporator inlet outlet lines usually coming out of the fire wall. then follow the line that runs to the compressor. that is your low side line and the service port should be on that line
There are two A/C refrigerant lines. The small line is your high pressure line and the larger line is your low pressure line.
Start at the fire wall and follow the "large " low pressure line to the compressor. The low pressure charge port will be some where on that line.
DO NOT try to recharge on the high pressure side ( small line )
Good luck, let me know.
Regards,
The largest diameter line is the suction which is low. The small one that runs to a coil by radiator is high pressure. If there is no cooling then you may have air in the system which means a leak must be fixed first. Are you sure the compressor is engaging? You should hear it click and the engine bog down a little.
The AC charge port is the on low pressure AC line (large line from compressor) near the firewall. Take care not to overcharge, there are other causes of no cooling like a stuck AC compressor cycling switch or a air temp control blend door motor malfunction, what is the issue u have? does the AC compressor run?
your a/c vaccum switch needs replaceing. one of the knobs that control the aux a/c. there is not enough vaccum to open the door for the a/c in the back
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