How do i find my low pressure line on my 98 buick park ave a/c system?

Mr. plevine, you first have to determine whether your system uses R-12 or R134a before servicing or troubleshooting it. How do you know whether the system in your vehicle uses R-12 or R-134a? LOOK FOR SPECIAL INDENRIFICATION DECALS OR LABELS ON THE MAJOR COMPONENTS.What else should you look for? The high-side low-side service fittings on an R-134a system are completely different from those used on an R-12 system.On an R-12 system, the high-side service fitting is a 3/8-inch 24 for screw-on couplers; the low-side fitting is a 7/16inch 20 (also known as 1/4-inch flare fitting) On an R-134a system, the high-side and low-seide service fittings are special 1/2-inch Acme-type fittings with no external threads. They have internal threads, but they're for the specially-designed caps unique to R134a fittings. Mr. plevine look for a RED-CAP for high-side BLUE-CAP for the low-side. Be mighty-careful when you service airconditioning system.


GOOD LUCK!

How do i find my low pressure line on my 98 buick park ave a/c system?
Look for the fat or large line. There is a small line ( high side) and a large line( low side)


If you are connecting a set of gages it is not possible to hook the low pressure fitting to the high side as these fittings are 2 difference sizes.








Note : This is not a job for a laymen. Don't do this if you do not understand the ac system
Reply:98 buick will have r134a freon in it and the fitting are idiot proof the low pressure fitting only fits the low pressure line and it is the bigger fitting that is the low pressure line and usually has a blue cap