[Slicer280]

Thanks joeysworld, I too have the same problem with my 97 Silverado. I went to NAPA and they sold me 2 cans of 134-a and the hose. They said also just hook it to the LOW SIDE port have the engine running and air on full the pierce the can and let it empty in. He also mentioned what you said about jumping the compressor. I went out to do it armed with gloves and eye wear for fear or coolant damage. My worry was that if I hooked it to the wrong port ( high side ) I would blow the can up in my face. I saw the two black caps you mentioned on the top of the compressor, one horizontal facing me ( smaller end ) one right next to it to the left vertical facing up to the hood.

Here's my worry. I did not find your post until after I quit for the night but...the cap to the left facing up had stamped OWS on the fitting..I couldn't read if there was an L so I assumed it meant LOW SIDE. I went through the steps but found out the hose would not fit on that fitting. I pulled the cap off the fitting facing me and it was a smaller fitting so I thought well maybe it's supposed to go there....but I was worried because it had no markings on it. Everywhere I have read said the hose will only go on the low side fitting....but then I thought if there are more then one size hose, maybe NAPA could of sold me the wrong size. So I never went through with it. Now I read your post and I'm thinking I should of hooked it to the port facing me that was smaller. If you think about it both ports are on the same hose they are just both connnected by a block. Maybe that would explain why the other port had OWS stamped on it?
I just worried I don't want to blow the can.

What are your thoughts.