Something wrong with AC system...

[vikasintl]

I tried to recharge the AC system by using adapter and added R-134a refrigerant...it took about one and half cans of refrigerant and it started blowing cold but than suddenly engine cut off

now whenever I connect that electrical connector to compressor engine cuts off ....so I was told to change compressor...correct me if I have wrong info..

if not any instruction guide to change AC in my 1989 GMC S15

What type of oil and how much oil I should add along with refrigerant?

also how much refrigerant should be added? I mean what is capacity?

Also, any diagram showing low port in this model?

[LeoS41280]

delete

[vikasintl]

Well I am not sure if I used the right port to fill in ...yes its r12 system but using adapter we are changing it to 134a because it was already empty ...there was nothing in there so r12 was gone..

[LeoS41280]

delete