How to change freon on 94 corolla?

Question

I found the freon fill valves and one has an "h" on it, the other an "l". I suppose that means High and low. If I want to change the freon, how do i go about doing so?

Thanks

Answer 1

You do not change freon - it is a stable compound which will not deteriorate inside the closed system.

If you have a problem with the Air Conditioning not producing cold air - it will be necessary to take the car to a qualified a/c service facility. Federal Law requires all service to meet specific requirements including recovery and recycling of all refrigerant. This is due to the adverse effect freon has on the ozone in the atmosphere. Please do not attempt to add freon to your car.  

Answer 2

Being a 94 its probably freon and you have to retrofit it to r134a since freons hard to get. Pretty much you have to buy a kit with new valves that s***w onto the old ones. You first have to empty out the system, s***w on the new valves. hook up to the low side line with your can of r134a that comes with the kit and charge roughly 3/4 of what the cars stock system capacity being that r134a is haevier than freon. Dont overcharge or the system wont work right.

Answer 3

Please, don't do it yourself.  If its low its leaking and you need to pull the A/C system down to a vacuum to get all the air out of it before you car charge it.  But the leak needs to be fixed first!  If you don't take it to a shop any fix will last only a day or so.

Answer 4

You don't change freon. If your A/C isn't cold you either have a leak or it's plugged somewhere. A recharge may make it work but for a short time only. In most states now you have to be certified to even buy freon. Also there are more than 1 type, NO NOT MIX THEM!!! Some have been found down south to be FLAMMABLE, like driving around a bomb! Best bet, take it in to a repair shop. R-12 isn't cheap so check into getting it retrofitted over to R-134a. Save money if you need to ever get it filled again. Good Luck