Ok, I have 2 questions: 1) can r134 and r134a be used together??? 2) Where can I buy the housing that goes around the evaporater ?? My blazer is a 2000 LT 4x4. So far I've had good luck redoing the A/C system. Last thing is replacing the compressor,charging the systek and that Dang housing.....Any help is greatly appreciated.... THANKS

 

1) I'm not sure where you even found R134, but don't use it and don't mix the two. Use only R134a.

2) You'll probably need to get that housing at a junkyard, or maybe find a used one on ebay. They get brittle when they get old and they break easily, so good luck finding one in good condition.