Does anyone know if a 1999 Dodge caravan 4 cylinder , takes R14 or R134a, my air conditioner is blowing hot and I wanted to see if I can fix it with a bottle of r134.

You should be able to use r134 without any problems but if you have a leak in the system it won't stay cold long.Depending on the size of the leak if any will determine how long it stays cold like if you have a really small leak it might stay cold for a few days or maybe even a week if the leak is bigger might be cold for just hours or like one day.You might not even have a leak as the vehicle is 11 years old and may just need recharged.

R-134

Actually they now use R14 in all newer vehicles because it is "Greener" for the environment.If you put in something not compatible with the new A/C machines that work on air conditioning you could contaminate the system so A/C tech's will not work on them. So be safe and use a R14 refill kit with a sealer and an A/C dye so if it does leak you can see where it comes out with a special light!