Not a blown head gasket,what are these very small bubbles?

victtor · #1 Jun 27th, 06, 12:08 AM

HI two seperate tests done on my zz454 not a blown, head gasket as first thought ,no hydrocabons in rad ,so what are the very small bubbles in rad?
These bubbles are the size off a pin head ,is this normal to have some very small bubbles in these crossflow 4 row rads ,would a leaking intake gasket cause these minute bubbles ,this is when rad is filled right to fill neck u can see them ,have any u guys seen these bubbles and not had any water consumtion issues
thanks once again 4 the input
victtor

GM Parts1 · #2 Jun 28th, 06, 05:38 AM

airation.

**Everett#2390** · #3 Jun 28th, 06, 06:40 AM

Agreed. Since you have the cap off, coolant sytem cannot pressurize to help prevent cavitation.

**JimM** · #4 Jun 28th, 06, 06:42 AM

yup, not a problem.

But don't fill it to the top unless you have a recovery system on it. Fill to the full cold mark on the rad tank or it will puke all over when the pressure comes up.

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