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post #11 of Old 06-11-2015
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Re: Coolant puzzle

I have the same engine on a Catalina 36. It does not use a header tank. There is an overflow hose from the radiator cap that just goes to the bilge. Your system may be designed such that you do not need the header tank. If you open the cap like the one you have shown when the engine is still hot, you will get bubbles. When the engine is cold you should see coolant level at about and inch or more below the hole opening for the cap. Do you have a temperature gauge? If your engine is running at about 180 degrees or lower, you should be OK.

1984 Catalina 36 Tall Rig
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