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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.
Operating instructions:
The transparent cylinder of the tester contains a blue reaction
fluid which turns yellow when exposed to air which contains the
slightest amounts of carbon monoxide. When the test fluid is
exposed to fresh air, it regenerates, i.e. turns blue again. The
fluid can be checked by exposing it to exhaust emissions from the
exhaust pipe. The fluid should then turn yellow.
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