High pressure on the low pressure side ( AC )

[joereef]

I converted my 93 SHO to R-134a put in the proper cycling switch, evacuated the system on 29" of vacuum for 45 min. Then added 6 oz. ester oil and 30 oz. of refrigerant. I bought manifold gauges at Harbor Freight. It measures pegged out on the low side and 240 on the High side, It sucked in all the refrigerant. Could the Drier be plugged up? It blows real cold air. it was probably 85/88 outside temp. Or could I just have a faulty gauge?
Any input would be greatly appreciated.

 

[kevinspann]

If it's blowing cold air, and not making any bad noises, I'd blame it on a faulty gauge first. Swap the gauges out with a new set and see where the pressures are.

 

[SHOtime2511]

I'd say the gauge is wrong.
If the low side was pegged you would surely not have cold air.

 

[luigisho]

I would go somewhere and get another reading just to be sure what you have. That being said, I'm ready to chuck my HF gauges in the trash.

 

[projectSHO89]

Close BOTH the valves on the gauge manifold. Your readings indicate that the high pressure side is leaking over to the low pressure side.