CPS TEMP-SEEKER TM360 Manuel du propriétaire - Page 10

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AUTOMOTIVE AIR CONDITIONING

TEMPERATURE DIAGNOSTICS

When using the diagnostic flow charts (DFC) follow these procedures: 

•

Ensure the vehicle is properly secured in "Park" and the "Parking Brake" is

properly applied. 

•

If possible, have the vehicle exposed to sun-load.

•

Open all vehicle doors. 

•

Ensure the engine is at operating temperature. 

•

The engine should be operated at idle speed. 

•

Set the blower speed to high. 

•

Operate the AC system for at least five minutes in the MAX AC mode before taking

any measurements. (MAX Mode is typically: compressor on, air directed to the

face vents, fresh/recirc door in the recirculating mode, not the fresh air mode, and

blower on high. Some systems have a MAX mode, others don't any must be set

this way manually.) 

•

Obtain the OEM's (Original Equipment Manufacturer's) spec charts for both

temps and pressures, for the vehicle you are servicing! These charts will show

both specific duct temperatures and system pressures, based upon ambient

temperature, and relative humidity levels. You will notice that today's vehicles, will

NEVER obtain duct temperatures possible on older vehicles of just a few decades

past.

For example, an OEM spec chart for a current R-134a system, with ambient temps

between 96-105+°F and a humidity level above 40%, shows duct temperature in

a properly functioning system will be no lower than 72°F. Placing a temperature

probe in a vent and condemning a system that is not reaching 38°F is NOT the

proper way to test a system. Referring to the vehicle's dedicated specification

charts is a must, for proper AC system service. 

•

Measure air temperature from the duct closest to the evaporator and compare

your reading to the OEM temperature performance chart, noting ambient air temp

and humidity level. 

•

Measure the temperature drop across the condenser from the condenser inlet

pipe to the condenser outlet pipe, as close to the condenser as possible. Refer

to the Condenser DFC-A (Diagnostic Flow Chart A) in the appendix and follow its

recommendations. 

•

Measure the temperature drop between ambient air and the discharge duct closest

to the evaporator and follow the recommendations of DFC-B, in the appendix.

•

Measure the temperature drop between the evaporator inlet (downstream or after

the refrigerant metering device) and outlet pipes and follow the recommendations

of DFC-C, in the appendix.