DSG-423 COOLING SYSTEM
05-8
Cooling System Pressure Test
WARNING: REFER TO CAUTIONS AND WARNINGS
AT THE BEGINNING OF THIS SECTION.
1. Remove the radiator cap from the radiator filler neck.
CAUTION: Do not pressurize the cooling system be-
yond 138 kPa (20 psi).
2. Fill the radiator as needed.
3. Fit the pressure tester to the radiator neck.
4. Pump the cooling system to a maximum of 138 kPa
(20 psi) and hold for 2 minutes.
5. If the pressure drops within this time, inspect for
leaks and repair as necessary.
Radiator Cap Pressure Test
WARNING: REFER TO CAUTIONS AND WARNINGS
AT THE BEGINNING OF THIS SECTION.
1. Inspect radiator cap and seals for damage or
deterioration - replace as necessary.
2. Fit the radiator cap to the pressure tester using an
adapter.
NOTE: If the plunger of the pressure tester is depressed
too fast, an incorrect pressure reading will result.
3. Slowly pump the pressure tester until the gauge
stops increasing and note the highest pressure
reading.
4. Release the pressure and repeat the test.
5. Install a new radiator cap if the pressure is not 124
kPa (18 psi).
Thermostat Operational Check
1. Hold thermostat up to the light.
2. Visually check the valve to be sure it is air tight.
• Leakage of light all around the valve (at room
temperature) indicates a bad thermostat.
• A slight leakage of light at one or two locations on
the perimeter of the valve is normal.
3. Place the thermostat and a thermometer in water.
4. Gradually increase the water temperature
5. Replace thermostat if it does not open at the
specified temperatures:
• Starts to open: 90°C (194°F)
• Fully open: 97 - 106°C (206.6 - 222.8°F)
Pressure
Tester
Adapter
Cap
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