If any method other than the CRUISE ON-OFF switch was used to cancel cruising speed and the system is still activated, the most recent set speed will automatically resume when you move the lever up.
It will not resume, however, if the vehicle speed has dropped below approximately 30 km/h (20 mph ).
Air bag non-inflation conditions
...
Air Conditioner Refrigerant/Compressor Repair procedures
Refrigerant Recovery
When removing HFC-134a (R-134a) from the air conditioning
system, use only U.L.-listed service equipment certified to meet the
requirements of SAE J2210.
  ...