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Do head gasket test kits work in coolant expansion?

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As per title.

I bought a head gasket test kit online. 

My wife's car has oil in the coolant reservoir. I want to test to see if it has a head gasket issue.

It's possible that it could be a bad oil cooler seal which allows oil to enter the cooling system. 

Pack says to put the S shape instrument on the radiator opening. But the car doesn't have one. I only have an expansion tank
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