Cool air thru driver side, warm thru passenger side Vents

[mautzi]

Don't think I've ever had the refrigerant refilled. After how many years woudl you have to refill? also is it typically easy to find the leak if there is one? thanks for your quick response.

[mautzi]

so I took one of the valve caps off (the top one - there are 2 on the left if you are facing the engine) and I could hear a hissing noise. Is that normal? If I put the cap back on I do not hear any hissing.

I am getting a can of refrigerant and going to refill it today.