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Date:         Wed, 21 Sep 2011 20:22:16 -0700
Reply-To:     Travis Newhouse <travisnewhouse@GMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Travis Newhouse <travisnewhouse@GMAIL.COM>
Subject:      Re: 85-H20 loss of coolant mystery
Comments: To: Scott Daniel - Turbovans <scottdaniel@turbovans.com>
In-Reply-To:  <0b2801cc78ce$9bb24750$6401a8c0@PROSPERITY>
Content-Type: text/plain; charset=ISO-8859-1

Thank you for all of the suggestions.

I tried the at-home pressure test. Engine was cold. I removed the expansion cap to make sure I wasn't starting with pressure in the system. Replaced the expansion cap and started the engine. I let it run for about 1 minute. I revved it a little from the engine bay, trying to see some of the bubbles in the expansion tank that I've seen before. I shut it down and let it sit for 30 seconds. When I removed the expansion cap, I heard a small rush of air and I noticed the coolant level in the expansion tank rise up a little bit.

So, it could be the pressure was caused by heated air trapped in the system, or it could be exhaust gas being forced into the system. I'll call around to see if any shops nearby can sniff inside the expansion tank.

If the sniff test is positive, what is the best way to isolate which cylinder head gasket may be leaking?

Thanks, Travis


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