So long story short my neighbor put 134a in my vehicle that requires r1234yf and now it's blowing hot. It was cold before just not super cold. But now it's hot. So to what I read of your writing, the 134a should be working just fine in my system designed for 1234? At a loss as to what to do at this point because I can't afford to take it to a shop. Do I just need to get a vacuum pump then add the 1234 or what could possibly be the problem seeing as you said 134 should work just fine?Figured I’d post an update to this as I’ve gotten a few private messages asking how it’s worked. I’ve had literally zero issues since charging with r134. The system has worked great for almost 25k miles thus far.