Hey guys, I am a newbie! I have replaced the A/C compressor on my 90 model Silverado, the new comprssor seemd to be a little differnt than the OEM compressor, the old compressor has O Rings where the hoses bolt to the compressor, the new one came with a red and green metal O ring with a rubber seal in the middle and a few other thinner O rings that are the same as the colored ones, I do not know which ones go back in the compressor also there seems to be a sensor in the top of the compressor with a button type fitting, the old had a small female plug and the male is wired to the vehicle. Does any one know how I need to fix this problem? The new compressor came from a GM A/C parts distributor so I know thw compressor is the right one for the truck! Any help would be greatly appreciated!!!!