Cooling System Draining and Filling
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Warning:
With a pressurized cooling system, the coolant
temperature in the radiator can be considerably higher than the
boiling point of the solution at atmospheric pressure. Removal of
the surge tank cap, while the cooling system is hot and under high
pressure, causes the solution to boil instantaneously with
explosive force. This will cause the solution to spew out over the
engine, the fenders, and the person removing the cap. Serious
bodily injury may result. |
Note: Use only a GM
released anti-freeze mixture and ensure a concentration of 50
percent water to 50 percent antifreeze. Antifreeze does not just
prevent the cooling system from freezing up, it also protects all
the components that are in contact with coolant from rust/limescale
deposits. As a result, antifreeze should always be added, even in
tropical countries.
In addition to the anti-freeze mixture, water quality also
plays an important role. Potable tap water should normally suffice
to fulfil this requirement. The quality of regenerated sea water is
not suitable.
Damage may also be caused to the engine if unauthorized
anti-freeze agent is used.
If radiator, cylinder head or cylinder head seal have been
replaced the old coolant must not be re-used.
Cooling System Draining
| 1. |
Open cooling system. Unscrew
coolant surge tank cap. |
| 2. |
For draining the cooling
system, open the drain screw (1) on the radiator. |
Cooling System Filling
| 1. |
Vehicles with air condition,
switch air conditioning off. |
| 2. |
After draining the system,
close the drain screw on the radiator. |
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Note: Close vent
screw when coolant flows out on the loosen vent screw.
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| 3. |
Remove the vent screw (1) on
radiator and turn in one thread again. |
| 4. |
Top up coolant up to the
bottom line of the bleed nozzle on the coolant surge tank
(1). |
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When the coolant has stopped dropping top up the coolant until
the bottom line of the down pipe hole (black arrow). |
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Note: After Engine
Start top up coolant immediately until the bottom line of the down
pipe hole (black arrow) and close cap.
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Note: After removing
the heater core (located in passenger room) the following
additional work has to be done:
Kick the accelerator pedal 3 times immediately - thereby
the engine speed should not exceed 2500 RPM.
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Warm up engine at idle speed up to 2.500 RPM until radiator fan
setting switches on. |
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Note: After removing
the heater core (located in passenger room) let the engine run for
further 2 minutes at 2.000-2.500 RPM. This ensures complete venting
of the cooling system.
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Kick the accelerator pedal 3 times - thereby the engine speed
should not exceed 2.500 RPM. |
| 8. |
Switch the engine off and let
the engine cool down. |
| 9. |
Check coolant level and
correct the coolant to welding area (1) if necessary. |
| 10. |
After a test drive let the
engine cool down and check the coolant level again. Adjust the
coolant level to welding area (1) if necessary. |
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