You will find the low presser service port on the A/C accumulator which is located on the frame, driver's side. Just follow the low A/C line from the compressor to the Accumulator and you'll be good to go. Here s a link to help you find it.
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http://www.compnine.com/index.php?u=1&year=1998&artnbr=MW09-010&artsfx=NULL&supplgroup=NULL&catcode=18W&modelcode=W&makecode=C&modelseries=WA&uid=1&modelid=1147577283&capuid=1&majorgroup=09&grouptype=B
Have the air-conditioning system discharged or evacuated of refrigerant by certified personnel at a dealer service department or automotive air-conditioning repair facility.
Raise the hood and disconnect the negative battery cable terminal from the battery using a box-end wrench.
Disconnect the electrical plug-in connector from the compressor clutch by hand.
Remove the drive serpentine belt from the compressor clutch pulley by taking the tension from the pulley using a breaker bar and compressing the torsion spring tensioner.
Disconnect the refrigerant lines from the compressor with the box-end wrenches. Plug the open fittings to prevent the accidental entry of dirt and moisture; quarter-inch rubber stoppers are a good fit for these connections.
Loosen the mounting bolts with the box-end wrenches, and remove the bolts from the compressor clutch mounting bracket and lift the clutch out of the vehicle.
Pour out the refrigerant oil into a graduated container so you know how much new oil to add to the new compressor.
Installation is in the reverse order of removal. Always replace all O-rings with new ones that are specifically made for use with the new R-134a refrigerant. Lubricate the new O-rings with R-134a-compatible refrigerant oil.
Evacuate and recharge the system with the proper amount of R-134a refrigerant by the same certified mechanic that discharged the unit before you replaced clutch. Have the mechanic start the engine and let it run for a few minutes; this will let the system stabilize and the compressor cycle on and off.
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