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With engine running, place tester on coolant compensation
tank.
By actuating rubber bellows, air is sucked from coolant
compensation tank. Coolant must not be sucked out. If blue fluid in
upper chamber of test apparatus turns yellow, cylinder head gasket
or 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.
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