Idiomas disponibles
Idiomas disponibles
GB
HC-CARGO Temperature testing tool
With the new HC-CARGO temperature testing tool, you can now easily test and diagnose potential
failures within the air conditioning system (Expansion Valve – Receiver Drier System & Flooded and/
or Evaporator System – Orifice Tube/Accumulator System).
How to use the HC-CARGO temperature testing unit
1. Turn on the engine
2. Turn on the A/C system at the lowest working temperature and bring the engine up to full
working temperature.
3. Place the testing unit's 'arms' on the inlet and outlet of the air conditioning component.
4. On the testing unit's display you will be able to see the measured temperature of both the
inlet/outlet and the difference between inlet and outlet in either Celsius or Fahrenheit. When
measuring the condenser inlet and outlet, please see the condenser testing chart
Note: Ambient temperature, Recirculation air, blower speed, doors open and engine RPM can
influence the test result, and should be taken into consideration when evaluating the result.
Condenser Testing Chart
Temperature change from condenser inlet (top) to condenser outlet (bottom) in Celsius
5º
8º
11º
14 º
Poor cooling and/or
high head pressure
Potential symptom causes
• Poor air flow across
condenser:
• Bent/damaged fins
• Debris on surface or
between condenser/
radiator/other coolers
• Missing air dams
• Bad/slow cooling fan
motors, weak thermal
fan clutch, inoperative
electronic fan clutch,
broke/missing fan clutch
• System overcharge of
refrigerant may be due
to improper service or
replacement of original
condenser with up-graded
design
17º
19º
22º
Normal operationel range
1970-1996
• Lower range: 14-17 º Celsius difference – typical of
tube and fin design
1996-2008
• Upper range: 19-28º Celsius difference – typical of
multi-flow
• 6mm round tubes grouped together unable to flush
• May fall into higher temperature range if some tubes
are stopped up
2001 – current
• 19-28º Celsius difference – typical of parallel flow
• Can have hundreds of tubes, smaller than the
diameter of a paper clip, that cannot be flushed. May
fall into higher temperatures range if some passages
are stopped up
• Parallel flow condensers vary be the tube count,
number and size of passages, which change the
refrigerant required (typically less refrigerant with
smaller, more narrow tubes
• Since late model systems and front end crash vehicles
require condenser replacement when repaired it is
possible a condenser with different configuration
than the original factory unit may have been installed
requiring an adjusted refrigerant charge from the
factory specifications (less charge)
24º
28º
Vedpak 199_Version 1_18.11.2014
2
253528
30º 33º 36º 39º 42º 45º
Poor cooling and/or high
head pressure
Potential symptom causes
• Internal restrictions - will
distort all pressure/
temperature readings and
must be resolved in order to
evaluate compressor function
and the balance of the
system (especially variable
compressors)
• Orifice tubes may appear very
clean because of extremely
small passages in parallel flow
designs trap debris flowing
through the condenser
• Condensers in this tempera-
ture range will usually require
replacement to produce
an efficient A/C system.
Especially when a failed
compressor is replaced
