From what I've read, R12 is colder. The A/C on my '69 Cadillac blows very cold. According to the shop manual, the air at the outlet vents is 45 degrees when set at maximum cool. R134 is more like 50-53 degrees..
In respect to this, is r12 colder than 134a?
In retro fitted systems, R12 is colder by a few degrees. If you use an updated condenser (most are) and a Sanden compressor, go R134a. New systems designed for R134a will freeze you out of the car. In retro fitted systems, R12 is colder by a few degrees.
Secondly, what happens if you mix r12 and r134a? The oils are different and not compatible and can cause an explosion. R134a is also a smaller molecule than r12 so if you HAD a small leak with r12 that you did not fix you have an even bigger leak now. R134a is so much smaller than r12 that it will leak right through the older hoses used for r12.
Likewise, how cold does refrigerant get?
The refrigerant is a special fluid that changes between liquid and vapor at convenient temperatures for pulling heat out of air that's at about 75° F and dumping it into air that's above 90° F.
What temperature does r134a freeze at?
-103.3 °C
Related Question Answers
Can 134a replace r12?
The R134A as a replacement for R12Using the R134A prevented the damage to the ozone layer. The R134A is now commonly used in the air conditioning systems in vehicles, but it can also be used in fridges, freezers and other coolers similar to the applications of the R12.Can you put r12 in a 134a system?
This is because R134a doesn't cool as well and needs a larger area to dissipate heat and is charged to higher pressures. That said, the oils used by R12 and by R134a are different and not compatible. If mixed, they form an acidic sludge that is bad for the system.Can you use r12?
The availability of R12So when someone says, “You can't get R12 anymore,” or “It's illegal to use R12,” those things simply aren't true. You can get it and use it.When did cars stop using r12?
1993
How do I know if I have r12 or r134a?
R12 fittings look like a tire valve stem, with threads on the outside. R134a fittings look like a air hose 'quick connect' fitting.What is the coldest freon for cars?
Interdynamics Artic Automotive Refrigerant R-134aThis state-of-the-art Freon freezes like the North Pole due to its advanced QwikBoost chemistry, meaning that you'll get colder air up to 50% faster.How do you convert r12 to r134a?
How to Convert an R12 to the R134a System - Discard any R12 refrigerant still in the system by taking your vehicle to a licensed air-conditioning professional.
- Open the engine compartment of your vehicle.
- Push the high side retrofit R134a fitting over the old fitting and use a wrench to tighten it.
Are r12 and r134 fittings different?
There is a lot of differences between the R12 and the R134a fittings, you can't mistake them. Yes, you can accidently fill a converted R134a system with R12, only if they left the R12 fittings on it. The fittings themself are so far apart from the function and operation, one will not interchange with the other.Should the suction line be cold?
When the system is operating, the large insulated suction line should be cold to the touch and sweating at any point where there is no insulation. If the suction line isn't cold, or the liquid line isn't warm, servicing should be recommended.What makes car AC colder?
The most common causes of broken air conditioning are leaks or compressor issues. If your air is blowing cool but not cold, the problem could be a clogged filter, cooling fan problem, radiator trouble, or it could simply be that you need to recharge your AC.Why is the suction line cold?
Because the coils are so cold, the condensation that forms on the coils will freeze. As ice builds up on the coils, it restricts the air flow through the coils. This cause the temperature of the suction line to drop, and just like in the evaporator, cause the condensation to freeze.Is Freon always cold?
The Freon liquid then flows through an expansion valve, which causes it to cool down until it evaporates. The result is low-pressure Freon gas. The cold gas is then channeled through another set of coils. This allows the gas to absorb heat and lower the air inside the room or building.Can you still buy r12 refrigerant?
R12 is difficult to find now a days. It was phased out all the way back in 1994 and was replaced with R-134a. There are very few places where you can actively buy R-12 today.What happens if you put the wrong refrigerant in your car?
If the wrong refrigerant is put on top of another refrigerant, the Expansion device will become erratic in operation. If the wrong refrigerant is put on top of another refrigerant, the Expansion device will become erratic in operation.What freon can be mixed with r12?
The other two refrigerants that are considered good replacements for R12 are R-401a and R-401b. R-401A is the mixture by weight of 53% of R-22, 13% R-152a and 34% R-124. It is good replacement for R12 in the applications where the evaporator temperature is -23 degree C and above.Do I need to add oil when recharging AC?
You normally do this when recharging the system after replacing one of the major components. This is tricky. The service manual normally tells you how much refrigerant oil should be added with each major component replaced on the AC system. Off-the-shelf cans sometimes come with refrigerant oil in them as well.Can you mix red Tek 12a with 134a?
Significantly less product is used to complete the same function. SYSTEM COMPATIBILITY: RED TEK® 12a is compatible will R12 or R134a systems including: Metal components.Can you use 134a in place of r22?
The Difference Between R134a and R22 Air Conditioner Refrigerants. R134a refrigerant is an alternative that contains no chlorine and hence no ozone depletion potential. It's a greenhouse gas, though, and it doesn't work as well as R22. 
John Parsons 
