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Engine at operating temperature (oil temperature >= 80
°C).
Inspect
With engine running, place tester on coolant compensation
tank.
Actuating the rubber bellows siphons air from the coolant
compensation tank. Coolant must not be siphoned out. If the blue
fluid in the upper chamber of the tester turns yellow, the cylinder
head gasket or the cylinder head is leaking.
Operation: In the clear cylinder of the tester there is a blue
reactive fluid that turns yellow when air is suctioned containing
the smallest amount of carbon monoxide. When fresh air is
suctioned, the test fluid is regenerated, i.e. turns back to
blue.
The fluid can be checked by exposing it to exhaust emissions
from the exhaust pipe. The test fluid should then turn yellow.
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