What are normal operating pressures for R134a?
For normal running pressures in the R134a system, at the lowest temperature, the coil should run at 22 pounds per square inch that is 45-20, 25 degrees Fahrenheit. While at the highest temperature it should be 57 pounds per square inches that is 60-20,40 degrees Fahrenheit.
How much freon does a 1989 Chevy truck hold?
NOTE!
| Year | Model | Refrigerant |
|---|---|---|
| Ounces | ||
| 8 Cyl. 7.4 Eng. w/ Front AC Only – w/ R4 Compressor … | 46.00 | |
| 1989 | All Engines Gas w/ Front & Rear AC – w/ A6 Compressor … | 72.00 |
| All Engines Gas w/ Front AC Only – w/ A6 Compressor … | 56.00 |
Can you charge R12 with R134a?
R134a systems operate at higher discharge-side pressures than R12, which can cause compressor seals to leak. Bottom line, R134a simply doesn’t cool as well as R12. The advantage of ester oil is that it works with both R12 as well as R134a, so you can fill the system with it and then use either refrigerant.
How much freon does a 1985 Chevy truck hold?
How much freon does a 1985 Chevy truck hold? During 1985, R-12 refrigerant capacity was bumped to 3.5 lbs. When substituting R-134a, adjust the charge weight to 3.2 lbs.
How much freon does a Silverado take?
The refrigerant capacity for the Silverado is 29 ounces or 1.8 lbs. if you want to refill the entire system. If the truck also has a back AC, it will take 48 ounces of R134a or 3 lbs.
What happens if you mix 134a with R12?
R134a systems work at higher discharge-side pressures than R12 systems, which could lead to compressor seals leaks. Additionally, since R134a is composed of much smaller molecules, it has a greater chance of leaking from an R12 system.
Is R134A a high pressure refrigerant?
As a low-pressure refrigerant system, the R134a is used in most home refrigerators as it is very effective and convenient for high-temperature applications. At ambient temperatures, the R134a is non-toxic and non-flammable. Also, it does not corrode metals like aluminum, copper, or stainless steel.
Can a 134a Charger be used with a R12 Charger?
Install 134a charge port adapters. Charge with 134a between 70-80% of the original R12 charge amount. Note: Hot gas valve will need to be adjusted during the charging process to properly adjust the low side by-pass pressure to 20psi. Replace any O-rings with 134a compatible. Ignore the sight-glass.
Which is lighter R12 or R134a refrigerant?
The volume of r134a refrigerant is lighter than the same amount r12 refrigerant. This not only is important to know for commercial refrigeration units, but it also is vital when making repairs on HVAC equipment and even cars.
Can a 134a compressor be charged with a R12 hose?
Drain the compressor oil and recharge with 134a compatible (PAG or Ester Oil) oil. This is assuming the compressor is currently functioning correctly. Replace or restore all rubber hoses with barrier hose. Install 134a charge port adapters. Charge with 134a between 70-80% of the original R12 charge amount. Replace any O-rings with 134a compatible.
What’s the difference between a R12 and are 134a heat exchanger?
In order to do the same job, an R-134a system will need a larger compressor and larger heat exchangers. As a result, a system that is retrofitted from R-12 to R-134a will have lower capacity (run longer) and will probably develop higher head pressures (not enough condenser area).