R-134a Systems

Do not pressure test R-134a systems with compressed air. Some mixtures of air/R-134a have been shown to be combustible at higher pressures.

A leak detector designed for R-12 will not detect leaks in a R-134a system.
1. Check charge level as described under "Performance Test" in this section.
2. When performing this test with original discharge pressure less than 30 psi, reclaim remaining refrigerant, then connect suitable vacuum pump and evacuate system to lowest vacuum possible.
3. Ensure system holds vacuum reading for at least 15 minutes. If system holds vacuum for 15 minutes a leak is probably not present. If vacuum did not hold for 15 minutes proceed as follows:
a. Ensure transaxle is in Park.
b. Run engine for five minutes, then ensure engine is idling at 700 RPM.
c. Charge system with 10 ounces of R-134a refrigerant.
d. Set A/C control to 100 percent outside air.
e. Set panel mode to full cool.
f. Set blower to high speed.
g. Place A/C button in ON position.
h. Open vehicle windows open.

4. Shut engine Off, wait approximately 5 minutes, then use a suitable electrical leak detector designed for R-134a refrigerant systems and leak check system. If a leak is found repair as necessary. If no leak was found fill system as outlined under "Performance Test in this section.