Re: '47 356 modern thermostat

Posted by HH56 On 2018/9/14 10:27:30

The bellows or diaphragm type thermostats were replaced with the capsule type when radiator pressures were increased over the no or very low pressures used until the early 50's. There are several places that go into detail explaining the theory and reasons why there were issues but Packard saw fit to include an abbreviated version in a service article and a separate tech bulletin when they made the change.https://www.packardinfo.com/xoops/html/downloads/SC/SC-VOL28NO5.pdf The bulletin we have on site is poor quality but the counselor explanation article is on page 39.