2nd Gen Non-Engine/Transmission Should I add R-134?

[Royk]

On hot days it seems to take forever to cool my little quad cab, and then it isn't really all that cool, just tolerable. I have never done anything with the A/C in the almost 10 years I've had it, so I figured it was just getting low and needed some added. So I looked at a thread here about A/C and it said the low side should between about low 20's to about 40. I looked at a chart online that said between 70-80 degrees outside, it should swing from 16 to 29. It was 75 outside when I checked it and I got about 18 to 38, which is what the chart says it should be when it is 80-90 outside. So my numbers seem pretty close to what they should and if anything, a bit high. So now I'm thinking I may do more harm than good by adding refrigerant. What do you guys think? I'm leaving on vacation tonight or tomorrow with the family and want to be comfortable.



Roy

 

[ata]

At 75 ambient temp the pressure shoud be 30 to 40 psi with a swing of about 5 psi. The air coming out of the center duct should be 38 degrees at 70 ambient temp or 44 degrees at 80 ambient temp. You should have these readings after 3 minutes at 1500 rpm's with air on high. Sounds like you are a low. Make sure you do not go past 40 psi at 80 ambient. The swing can go past a little.

 

[dresslered]

I juiced mine up last year. Fell a little short of full pressure (ran out of r134 and Kalifornia puts a $20 deposit on each can and didn't need the rest sitting on my shelf for ever) but it has been ice cold ever since.