11. EXPLANATION OF COMPONENTS 11.8.6 CLEANING AIR FILTER If the air filter for the FRESH or RECIRC air intake becomes clogged, the cooling or heating capacity will drop. To prevent this, clean the air filter with compressed air once a week. For details of the cleaning method, see “24.2 WHEN RE- QUIRED”, 11.8.7 CHECK TENSION OF COMPRESSOR BELT AND VOLUME OF REFRIGERANT (GAS) If the compressor belt is loose or there is a lack of refrige- rant, the cooling performance will be poor. For details of the maintenance method, see “24.2 WHEN REQUIRED”. 2-33