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I believe it is '88 and early'89... (archive)
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Posted by michael on August 19, 2001 at 13:53:18:

In Reply to: Re: 64-21-1-370-807 looks like the one (more) posted by Bill on August 19, 2001 at 12:10:55:

due to too high pressure to the interior heating core. A bypass valve was added to the hose from the rear of the head that feeds the heater. It has a thin hose that goes to a "T" and bleeds pressure off from the core. It is located near the firewall in the engine bay on the 3/4" hose.

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