I'm going to evacuate and refill my AC lines and was just wondering what the high and low pressures should be. Also about how much R134a does it take? I don think this is covered in the Rave CD.

 

Why are you thinking you need to do this? Do you have front and rear air, makes a difference in the amount of freon to install? You don't really want to do that, because to be done correctly, you would need to use a pump to build a vacuum inside the system to remove any moisture.

 

I don't have rear AC. Anywho I did it already and yes I have a vacuum pump and AC manifold gauges. I evacuated the lines with the vacuum pump for 30 minutes and then I filled it with 36 ounces of R134a and a couple bottles of oil. That put me at 35 PSI on the low pressure side which is probably a bit low but my AC is blowing ice cold now.

 

Good, glad you had a pump. Just curious, why did you need to do this instead of recharging/topping it off?

 

I thought I had a leak but have never been able to confirm where it is even with a sniffer. I've been topping off every summer for a few years but this year I have noticed that even though my pressure was 40 PSI my AC was not blowing very cold so I figured I would start from scratch. I have not driven the truck since I evacuated so hopefully it is still blowing cold. But now that I have the equipment (only cost $140 from Harbor Freight including 2 year extended warranties) if I do have a leak and need to do AC work I have the pump and gauges.

 

I'm a girl, so don't beat me up too badly...There is a valve with an L and a valve with an H (although the H looks to big to be the one to refill with Freon, the L looks too small...loose...help?

 

Nothing to do with you being a girl. A lot of people don't know much about A/C systems. The only sure way of doing this correctly is how the original poster did, with manifold gauges. But if you MUST use a quick charger can for some reason.... like you are miles from home or your mechanic.... you always connect to the LOW side, or you risk the can blowing up. Fortunately with R134a, as you noticed, the ports are different sizes.