MANUALS · HEATER, AIR CONDITIONER AND VENTILATION [55] · страница 88 из 118 · Открыть оригинал PDF ↗

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COMPRESSOR NOISE

ESSFXAA

Wheninvestigatinganairconditioningrelatednoise,you
mustfirstknowtheconditionswhenthenoiseoccurs.
Theseconditionsareweather,vehiclespeed,ingearor
neutral,enginetemperatureor any other special conditions
Noisesthat develop duringair conditioning operationcan
often be misleading: For example: what sounds like a failed
front bearingor connecting rod,maybecaused byloose
bolts, nuts, mounting brackets,Ora loose clutch assembly.
Verify accessorydrivebelt tension (power steering,alter-
nator or air pump). Improper accessory drive belt tension can
cause
misleading noise when the compressor is engaged
and littleornonoisewhen thecompressor is disengaged:
Drive belts are speed sensitiveThat is,at different engine
speeds, ad depending upon belt tension, belts can develop
unusualnoisesthatareoftenmistakenformechanical
problems within the compressor.

Adjustment Procedures

(1) Selectquietarea for testing:Duplicate conditions as
much as possibleSwitch compressor on and off several
times to clearly identify compressor noise.

To duplicate high ambient conditions (high head pres-
sure). restrict air-flow through condenser. Install mani-
fold gauge set tomakesuredischarge pressure does
not exceed 2,070 kPa (21.1 kg/ cm?300 psi): R-12,
2,550 kPa (26 kg / cm?, 370 psi}: R-134a.

(2) Tighten allcompressor mounting bolts, clutch mounting
bolt, and compressor drive belt, Check to assure clutch
coil is tight (no rotation or wobble).

(3) Check refrigerant hoses for rubbingor interference that
can cause unusual noises

(4) Check refrigerant charge (See "Charging the System

(5}Recheck compressor noise as in Step

(6)Ifnoisestill exists,loosencompressor mountingbolts
and retorqueRepeat Step
If noise continues, replace compressor ad repeat Step

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