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Radiator: Due to the larger chambers in the
radiator, flushing the radiator initially allows
kinetic waves to pass through the water,
wherein residue is removed more effectively.
Flood the lower part of the radiator. With the
radiator cap in place, firstly flush from the
bottom to the top. After one or two minutes,
flush the system from top to bottom.
Heater core: Connect the cooling system
flusher to the inlet hose (H) and commence
the flushing process. Ensure that the heater
regulator valve (G) is open or has been
removed, as described above.
Engine block: Connect the cooling system
flusher to the upper radiator hose (E) and col-
lect the water via the lower radiator hose (C).
9. Check the radiator hoses, the thermo-
stats and the water pump and replace as
necessary.
10. Firmly tighten the drain valve (B)
on the underside of the radiator.
Ensure that all hoses are correctly attached.
11. Fill the cooling system with the
correct coolant as recommended by the
vehicle manufacturer and ensure that you
bleed the cooling system correspondingly in
accordance with the vehicle manufacturer's
instructions.
When the coolant is drained from the cool-
ing system it is replaced with air. When the
system is refilled, air can become trapped
in the cooling circuit. Air in the system
must be avoided at all costs. Air bub-
bles considerably reduce the coolant
circuit and can lead to overheating of
the engine.
CAUTION
Take particular care when flushing
cooling systems that are in poor
condition.
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Design and function
HAZET-WERK Hermann Zerver GmbH & Co. KG
Furthermore, they accelerate the corrosion
process and reduce the service life of the
system. Some systems are equipped with
an air-bleed valve on the upper radiator
hose through which trapped air can escape
from the system. Other systems require the
expansion tank to be removed or to be lifted
upwards so that the trapped air can escape.
HAZET therefore recommends that the ve-
hicle maintenance instructions are checked
to ensure that the prescribed air-bleeding
procedure is used.
Vacuum radiator filler
HAZET 4801-1
12. Check the radiator cap (A) and the
expansion tank cap (A) (if applicable), and
replace where necessary.
13. Check the coolant level of the engine
at operating temperature, and top up as
required after the engine has cooled.
14. Carry out a final visual check to ensure
that there are no leaks.
Bear in mind that some leaks only become
visible when the engine is cold, and others
only become visible when the engine is hot.
G
H
A
E
D
F
C
B
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