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A/C PERFORMANCE TESTING

This guide outlines essential steps for A/C performance testing, ensuring optimal operation and safety. Start by establishing a consistent routine, consulting service manuals, and inspecting system components for signs of damage, leakage, and proper function. Check pressure readings with a manifold gauge set, including both low and high sides, and ensure compliance with specified temperature ranges. Perform quick visual checks to assess system efficiency, focusing on component temperature disparities. Utilize necessary hand tools, including thermometers and leak detectors, to conduct thorough evaluations for effective air conditioning system performance.

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A/C PERFORMANCE TESTING

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  1. A/C PERFORMANCE TESTING CHAPTER 3 Page 50-53

  2. PREPARATION • Develop a consistent routine. • Use Common Sense Approach • Consult Service Manuals • Cleanliness • Safety • Windows Down

  3. 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

  4. 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.

  5. 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

  6. Manifold Gauge Set Operation • Pressure Check of System - both valves closed • Charging with Refrigerant - Low side open • Evacuation - Both valves open Page 5L

  7. 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)

  8. “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

  9. 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

  10. 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)

  11. 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

  12. Be Cool Out There!!!

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