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96 Chevy Blazer pressures

Tsmith99 on Sat June 05, 2010 8:05 AM User is offline

Year: 1996
Make: Chevrolet
Model: S10 Blazer
Engine Size: 4.3 V6
Refrigerant Type: r134a
Ambient Temp: 81
Pressure Low: 40
Pressure High: 105

I've had a '96 Chevy blazer for 3 years. The AC has worked fine until last summer it would cool some, but not well. Then this spring the compressor would just cycle on for a second, then back off like it was low on refrigerant. I found a good deal on a set of Actron brand gauges at a yard sale. They're model CP7806. They were brand new, still in the package for $25. They say Robinair on the gauge faces.

Anyway, I hooked them up to the blazer yesterday evening and when the compressor would cycle on, it would show 10 lbs low side pressure. I'm guessing that's pretty low. I went ahead and added one can of r134a and it's cooling really great. My pressures after adding the can were 40 low side and 105 high side, this was at 81 degrees outside air temperature with the engine at idle. Are these pressures good, or do I need to add another can? I just don't want to overcharge it.

I did not pull a vacuum on it, as I don't have a vacuum pump. As soon as I can afford to buy one I will. I figured being that it wasn't completely empty of refrigerant maybe it would be alright without pulling a vacuum on it this time.


TRB on Sat June 05, 2010 11:54 AM User is offlineView users profile

You seem to have a leak which needs to be repaired! My suggestion is to make the repair pull and vacuum and recharge to proper OEM specs.

Compressor Type
2.2LHarrison V5 5-Cyl.
4.3LHarrison HT6 6-Cyl.
Compressor Belt Tension(1)

System Oil Capacity (2)

2.2L9 ozs.
4.3L8 ozs.
Refrigerant (R-134a) Capacity32 ozs.
System Operating Pressures (3)

High Side299 psi (21 kg/cm2 )
Low Side26 psi (1.8 kg/cm2 )
(1)Tighten serpentine belt until indicator mark on movable portion of belt tensioner is within limits of slotted area on stationary portion of belt tensioner.
(2)Use PAG Oil (Part No. 12345923).
(3)Specification is with ambient temperature at 80°F (27°C), relative humidity at 60 percent and engine speed at 1500 RPM.


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