HOW DO I KNOW IF MY HEAD GASKET IS BLOWN OR THE SEAL IS BROKE

  • Tiny
  • ray9191
  • 1998 Pontiac Bonneville
  • 240,000 miles

I think my head gasket is blown but I cant tell for sure

Sunday, January 15th, 2012 AT 4:01 PM

11 Answers

  • Tiny
  • jacksprat
  • Member

What are the symptoms? Is it over heating? Is the oil mixing with coolant or vice versa?

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Sunday, January 15th, 2012 AT 4:18 PM
  • Tiny
  • saturntech9
  • Expert
  • 28,434 posts

You can use a chemical tester which you can rent at auto zone to see if you have a head gasket or cracked head issue.

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Sunday, January 15th, 2012 AT 4:32 PM
  • Tiny
  • ray9191
  • Member

Its not over heating but I can see coolant come out the passenger everytime some one revs the car and I can smell it

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Sunday, January 15th, 2012 AT 4:34 PM
  • Tiny
  • M_H_RITZEL
  • Expert
  • 2,768 posts

If you don't have any water in your oil and vise versa auto zone also has a compression checker you can borrow to check the compression of each cylinder.

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Sunday, January 15th, 2012 AT 4:37 PM
  • Tiny
  • saturntech9
  • Expert
  • 28,434 posts

Where does compression come into play here?There talking about coolant. To find a blown head gasket you use a chemical tester to see if exhaust gases are entering the coolant from a bad head gasket. Where is the coolant coming from when you rev it up?If its just leaking coolant then I would use a coolant pressure tester to pressurize the cooling system. If you think its leaking coolant externally because of a bad head gasket or something like a cracked head you can use a cylinder leak down tester.I have used those to find exhaust ports leaking coolant from bad heads etc.

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Sunday, January 15th, 2012 AT 5:10 PM
  • Tiny
  • ray9191
  • Member

Here is a pictue where it leaks from

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Sunday, January 15th, 2012 AT 5:26 PM
  • Tiny
  • saturntech9
  • Expert
  • 28,434 posts

What size engine do you have?

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Sunday, January 15th, 2012 AT 6:13 PM
  • Tiny
  • ray9191
  • Member

It is 3.8l v6 3800 series

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Sunday, January 15th, 2012 AT 6:19 PM
  • Tiny
  • M_H_RITZEL
  • Expert
  • 2,768 posts

I see what your saying, After reading post again realized it was running all right just leaking fluid. Had one that kept missing from crack in cylinder wall.

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Sunday, January 15th, 2012 AT 7:20 PM
  • Tiny
  • ray9191
  • Member

Yeah it does not over heat it just leaks and makes a little grinding but I replace the intake about 3 years ago this all started when my friend floored it going around a coroner

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Sunday, January 15th, 2012 AT 11:53 PM

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