87 elcamino v6 4.3 t.b.i.
Extremely comprehensive and specific. I.d.k. how u know those numbers ,but I'm sure grateful. Next step , get guages,dye,134. Question? If I'm introducing 134 to low side as ive learned,how do I control high side pressure? Or are your figures what a properly functioning system has on hi side after @ 30 p.s.I. on low side?If you have even a couple of pounds of pressure, then that says there is still some R134a in the system, so you might get by without having to pull a vacuum. R134a is so cheap these days, it might be worth adding a few cans and see what happens. You should also add some leak dye at this point ( it will help you find a leak if there is one). You will need the gauges for this, as you will not know how much R134a by weight is left, and you normally charge by weight. Too much or too little will affect the performance, but you can get close by watching the gauges, and using a temp probe in the center vent of your dash. Trying to get to low pressure around 30, and high pressure about 2 to 2.2 times the ambient temp ( 80 degrees outside, high pressure 175 +/- 10%). Vent temps should approach 40 degrees. Charge with the revs about 1500 on the engine. make sure the radiator fan is in good working order.
If this doesn't work, and the dye doesn't show up a leak, then you are probably in for the full process as outlined above.