Maybe a bad valve
passenger side behind the carpet by your foot on the right side
It's located right behind the driver side rear wheel. You have to take that off, and the plastic cover behind it.
The PCV valve on the 98 is located in the top of the right (driver's side) valve cover near the back.
GM vehicles use side post batteries. The terminals are on the side of the battery. 98 Lumina with 3.8 it's on the drivers side under a red plastic cap for positive.
Just did mine on 98 Lumina... low and high side connectors were under air filter chamber box on drivers side. unscrew the top, remove filter, disconnect rubber neck and take our chamber to see AC connectors below. good luck Cat5Cane
bend valve,burned valve,ring,or a crack
low side port is the one at the compressor
Right behind crankshaft pulley on side. Depends on the amount of clearance you have to whether it is a piece of cake or not.
The low side ac port on a 98 Pontiac Transport should be on the side of the drier. The drier should be mounted on the passenger side near the radiator.
on right hand side of engine,on drivers side by back valve cover.it is round and has wires going to it on top!
if your tolking about the a/c low pressure switch it is under the hood on the pass- side back kind a close to the fire wall it screws onto the side of the a/c dryer which is black the switch has 2 wires that plug into it unplug and unscrew the switch