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Old 07-10-2013, 01:38 PM
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Coolant Level Question

I notice whenever I check my coolant it always appears to be low. Like to the bottom of the degas bottle. However, once I bleed the pressure from my degas bottle the level returns to the low mark on the tank. I dont see any evidence of puking. I also dont see any circulation in the degas bottle with the truck running.

My question is:

Is this normal?

Besides fluid expansion from heat, What causes your degas bottle to pressure up?

All help is greatly appreciated.
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Old 07-10-2013, 01:49 PM
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Coolant level will fluctuate when running. Mine would raise 1/4" when I released the pressure. However, extreme differences might indicate small bubbles (the air bubbles mixed in under pressure takes up less volume than under no pressure). This is what alerted me to pressure check my cooling system for HG leak... (about 1/2") and its a good thing, because I did find early evidence of failing gaskets. In my example, the dramatic increase in coolant level was probably both from aerated coolant and higher-than-normal system pressure.

Put all worries aside and do the infamous cooling system WOT pressure check. $15 is material and piece of mind (if you pass) or a head start (if it fails).
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Old 07-10-2013, 02:49 PM
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Thanks. I'll pressure test the coolant system and report back.


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