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A/C PERFORMANCE TESTING. CHAPTER 3. Page 50-53. PREPARATION. Develop a consistent routine. Use Common Sense Approach Consult Service Manuals Cleanliness Safety Windows Down. VISUAL INSPECTION. Inspect under hood for SIGNS OF LEAKAGE/HOSE CONDITION

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A c performance testing

A/C PERFORMANCE TESTING

CHAPTER 3

Page 50-53


Preparation
PREPARATION

  • Develop a consistent routine.

  • Use Common Sense Approach

  • Consult Service Manuals

  • Cleanliness

  • Safety

  • Windows Down


Visual inspection
VISUAL INSPECTION

  • Inspect under hood for SIGNS OF LEAKAGE/HOSE CONDITION

  • Inspect CONDENSER for signs of damage

  • Inspect COMPRESSOR BELT condition

  • Inspect COOLING SYSTEM condition

  • Inspect A/C Controls Function


Stabilize system
STABILIZE SYSTEM

  • Make sure Manifold Gauge set valves are shut before hooking up to system

  • Connect to the system

  • Start Engine and Run 1500 - 1700 rpm

  • Let Engine get to full operation temp

  • Turn on A/C and set blower to high and set A/C system to max A/C

  • Put thermometer in A/C duct inside car.


Manifold gauge set
Manifold Gauge Set

  • A Manifold Gauge Set

  • 3 Pressure Hoses

  • Low Side (blue hose) Compound Gauge - vacuum to approx. 250 PSI

  • High Side (red hose) Gauge - 0 to approx.. 500 PSI

  • Two separate Hand Valves

  • Some Gauges can be calibrated


Manifold gauge set operation
Manifold Gauge Set Operation

  • Pressure Check of System - both valves closed

  • Charging with Refrigerant - Low side open

  • Evacuation - Both valves open

Page 5L


Gauge pressure check
GAUGE PRESSURE CHECK

  • Low side average: 20 to 30 PSI

  • High side average: 160 to 220 PSI

  • High side “rule of thumb”: Add 100 PSI to ambient temperature example: It’s 80 degrees outside, add 100 PSI. approximate high side pressure should be 180 PSI

  • Discharge temperature should be within specified range for system. (35 to 50 degree)


Hand feel check
“HAND FEEL CHECK”

  • RULE OF THUMB:

    • All high side hoses and components should be warm to touch

    • All low side hoses and components should be cool to the touch

  • Note condition of TXV or FOT

    • Is is frosted on inlet side = bad valve or orifice or moisture in system


Quick feel check
QUICK “FEEL” CHECK

  • If ambient temp above 70 degrees F

  • Engine warm and at idle

  • Max A/C and High Blower

  • feel evaporator inlet pipe and accumulator

    • Both same temp and cooler than ambient - OK

    • inlet pipe cooler than accumulator - Low charge

    • Inlet pipe warmer than evap outlet - overcharge


Hand tools you will use
Hand Tools You Will Use

  • Thermometer

  • Leak Detector

  • Vacuum Pump

  • Snap Ring Pliers

  • Seal Installers/Removers

  • Safety Glasses

  • Can Taps and Hose Adapters (pg.. 49L)

  • Shut Off Valve Service Hose (pg. 46L)


Test control devices
TEST CONTROL DEVICES

  • Refer to Service Manual

  • Relative Humidity

  • Pg. 8C and 53L

  • Make sure if FOT system that clutch is cycling (norm temp)

  • Can test Expansion Valve if accessible

  • Condenser Fan Operation



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