I don't truly understand what you are asking but if the a/c system is cooling you don't need to replace the freon...
If you are trying to evacuate and recharge the a/c system then you will need to do the following..
1. Take the truck to any auto a/c shop and have them reclaim the freon..
2. Using a set of a/c gauges put the red hose on the high side and the blue hose on the low side then put the yellow hose on your vacuum pump..
3. Pull a vacuum for around 1-hour and then let it sit for 1-hour.
4. If it holds then add the correct amount of both freon and oil.
5. When finished the low side should be in the area of 35 to 40 psi and the high side should be in the area of 200 to 250 psi..
will a 1995 Chevy 350 lt1 motor work in a 1990 Chevy pick up
how do you replace the rear wheel bearing on a Chevy pick up
Low on refrigerant
Yes I have a 1990 with a 454 from the factory...
How do you replace the front drivers seat on a 1996 Chevy S10 pick up truck
how do you remove the ignition switch on a 1990 chevy half ton pick-up?
green
by a Honda
on mine i had the option of dropping the fuel tank or movink th pickup bed 2 feet back
Need to know a diagram of what.
That's usually an indication that the refrigerant level is low.
No, the frames are different lengths.