90 Riviera A/C

Can anyone tell me where the high and low valves are to convert A/C to R134?

Your refrigerant line fittings are located by the accumulator which is on the passenger side of the engine compartment, the accumulator looks like a round, silver cylinder. The accumulator will have 3 refrigerant linees to it and a charging port on it . I have never converted a system b4 but i hope this info is helpful. i know where every part is on my 86 riviera so if you need help with anything else just leave a message and i will try to help you out as soon as i read it. [email protected]