Evening folk's...I just replaced the expan. valve and drier (fun job!! NOT!!) on my 1990 type 126(420) and I'm ready to get it recharged. Everone wants to recharge it with 134a. Thats fine with me as long as it works. Do you need to flush out the system,even with the new drier? Are the oils compatible? Do you need to change the fan switch? I have a can of R12 and one guy said he could use that and top it off with "Freeze-12" but after reading the last post on that topic I'm a little leary...Any ideas?!? Thanks guy's!! Larry