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Subject:Re: Logan Pass - blew the expansion tank temp sensor
From:Loren Busch
Date:Thu, 9 Jul 2015 10:52:38 -0700
​RE: Bleeding the cooling system
The pre '86 cooling systems (1.9L stock WBX or same system with another
engine) does need bleeding and it is not a trivial process.  The later '86
and on, cooling system is diferent and will, for the most part, be self
bleeding.  You can get lucky with the earlier system but if any serious
loss of coolant there will be air in the system.  BTDT a bunch of times
with my '85.  No problems now with my '90.