Shane Posted July 19, 2014 Share Posted July 19, 2014 I was wondering if anyone knew when the cooling systems were switched from closed to open? I know a lot of changes happened for the. 91-92 models, but I've been seeing a lot of 1990 models for sale and it appears to be an open system. There is no pressure bottle on it. If someone could shed some light on this it would be appreciated? Link to comment Share on other sites More sharing options...
HOrnbrod Posted July 19, 2014 Share Posted July 19, 2014 According to the parts manuals, the change year was 1991. Link to comment Share on other sites More sharing options...
cruiser54 Posted July 19, 2014 Share Posted July 19, 2014 Correct. 91 when the HO first appeared. Link to comment Share on other sites More sharing options...
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