The a/c is blowing hot i checked the r134 and it is fine what could be the problem and how much money it will cost to fix

That is a real good question. However, NOBODY online can answer that question for you. There are many things that can cause your A/C system to blow hot air - even if the freon level is correct. It could be anything from a bad A/C clutch to a blend-air door actuator malfunctioning, to a low or high presuure switch alfunction, or even a cabin air or evaporator temerature sensor.

Your A/C system will have to be diagnosed before anyone can tell you for sure what is causing the problem. Even if I knew EXACTLY what was wrong and knew EXACTLY what parts (if any) are needed to be replaced, I still could not tell you how much it is going to cost for you to fix it. This is because a lot depends on where you live, how much parts cost in your area, what are the labor rates in your area, and WHO is going to do the job> Is it going to be done professionally? Is it going to be done by a new car dealer? Is it going to be done by an aftermarket shop? Are you going to do the job yourself? etc, etc. etc.