My S-10 Blazer has been having A/C problems. It is a 4.3L engine. I bought some gauges this weekend (seems like I always need some so I bit the bullet).
Pressures are psi. Refrig: 134a, factory installed. Static Pressure: H85, L87 Running Pressures: H 130, L 126 Both gauges show 102F for temparature Outside temp is about 98F Blows warm to hot air. This was somewhat gradual, i.e., it didn't blow cold one moment then hot the next.
The sight-glass in the manifold shows liquid about half-way up the glass with some bubbles on top.
The instructions with the gauges say to open the low-side while the system is running. However, it reading through some service books at the library, they say NOT to open the low-side while the system is running. If I keep the low-side closed, the pressure is around 75-80psi.
So, two questions:
1) Am I supposed to keep the low-side closed while the system is running? 2) What are my pressures supposed to be? (I realize this is ambient pressure sensitive, figure 100F 'cause that what it's likely to be around here for at least the next week or so)Thanks in advance
Bill W