Always check your evaporator coil for any foreign material such as dirt, leaves and bugs which may have been pulled through the air filter. Debris on the evaporator coil or fan blades will impair the cooling and reduce the air flow. Clean debris by using a air hose or vacuum hose. Be careful to not damage other components such as wiring, blower wheels and capillary tubes. Make sure the condensation drain hose is always clean of all debris.
A blocked condenser can cause excessive pressure and reduce the cooling of the system and shorten the compressor and clutch life. Check the condenser coil often and clean any debris in the same manner the as evaporator coil.
Loose belts cause slippage, check belts for proper tension. Slipping belts can result in damage to the belt and cause intermittent cooling. Belts under excessive tension can cause damaging stress on the compressor, bearings, clutch and crankshaft.
Check your hoses for wear. Check bends, clamps, and check for rubbing against other parts. Inspect for bake out hardness on the compressor discharge hose nearest to the compressor.
Check nuts and bolts on the compressor mounting bracket, the clutch should be tightened securely before checking and adjusting the belt tension and pulley alignment. Alignment of pulley should be rechecked with the unit running.
If your system is a heating air conditioning combination, check to make sure the water valve shuts off the water flow to the heater core.
Check the drain hose from the evaporator making sure it is not forced into the unit causing looping which can restrict the flow of moisture. Drainage restriction due to a kink or debris will over flow the evaporator drainage system and can cause leaking of the unit.
Check the sight glass for freon amount. On a 134A unit some bubbling should occur. If you see excessive bubbling your freon level may be low, if you see no bubbling your freon level may be to high. When adding freon make sure not to over fill, always know amounts needed to prevent unit damage.
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