39 AIRCONDITIONING 3. Refrigerant Fails to Circulate (Cycle Is Clogged Up) Problem Cause Check and remedy 1 when completely clogged up -Check receiver, exVacuum is imme- pansion valves, diately indicated EPR, etc. on the low pressu- -A temperature difre side. Clogging of ference occurs beA/C cycle tween IN and OUT 2. When slightly of the defective clogged up parts. Vacuum is gradu- -Be Sure to evacually indicated on ate the air after finthe low pressure ishing the remedy. side 4. Moisture Entered in the Cycle Problem Cause Check and remedy 1. The air conditioner operates Freezing of -Check the expannormally at the expansion sion valve, etc. beginning, but valve from -Replace receiver over time, vac- the press- (or dryer) uum is indicated ence mois- Be sure to evacuon the low pres- ture ate the air after finsure side. ishing the remedy. 5. Compressor Compression Failure Problem Cause Check and remedy 1. Pressure on low -Check compressor pressure side is - in the case of a high; pressure on compression malhigh pressure function of the side is low. Compressor compressor (the 2. When the A/C is defect compressor is not turned off the hot to the touch) low and high pressure sides soon equalize. Caution With a variable capacity type compressor, it is easy to mistake compression failure depending on several variable conditions. therefore, per- from troubleshooting by following the test procedure for the capacity compressor. Fig. 55 - Refrigerant fails to circulate Fig. 56 - Moisture entered in cycle Fig. 57 - Compressor compression failure
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