40 AIRCONDITIONING 6. Excessive Refrigerant, or Insufficient Condenser Cooling Problem Cause Check and remedy - Check refrigerant quantity. 1. Pressure is high - Slowly vent out reon both low pres- Excessive frigerant if oversure and high refrigerant charged. pressure sides. - Check and repair 2. Bubbles can not Poor con- condenser fan. be seen in the denser - Check vehicle cool sight glass cooling ing system. 7. Air Entered in the Cycle Problem Cause Check and remedy 1. Pressure is high on both low pressure and high - Replace the refrigpressure sides. erant 2. The low pressure Air is en- - Be sure to evacupiping is hot to tered in the ate the air after finthe touch. cycle ishing the remedy. 3. Bubbles are visible in the sight glass 8. Expansion Valve Opens too Far Problem Cause Check and remedy 1. Pressure is high - Check expansion on both low pres- valve. sure and high - Check the installapressure sides. tion condition of 2. Frost (dew) ap- Expansion the temperature pears on the low valve fault sensing bulb. pressure side pip- - This problem freing quently occurs after replacing the expansion valve Fig. 58 - Excessive refrigerant, or insufficient condenser cooling Fig. 59 - Air entered in the cycle Fig. 60 - Expansion valve opens too far
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