> I understand your point of view with regard to the > temp issue, but maybe > you > can make another thing clear to me. > What was the the default OEM thermostat type that > was fitted when our 1960 > Imperials leaved the factory? > I thought it was 180F I do not know why going to a 180 from a 160 would have solved your problems. If swapping thermostats out were a popular solution to a problem, don't you think you'd have heard about it? I have heard about rejetting carbs based on higher altitude as an ajustment, and a few other things like using anti-freeze or electrical block heaters where it is cold, but I have not heard or read of different regions needing different thermostats. Therefore, I think that someone made a mistake and put the wrong one in your car and that the 180 one is different and you're now back to where you should be (good news!) If you look at the booklets, you'll see what I was hoping you'd notice: 160 units are explicitly specified for 413 engines in trucks with thermostatically operated shutters on the grille. 180 is the only item I've ever heard about for Imperial, but I don't know THAT much about it. When a thermostat opens, it allows flow. If a thermostat opens at a lower temp, that should not make the car run cooler is my thought, but I am not well qualified to say. Perhaps the overall diameter of the different units is different and the 160 flows more per minute for industrial trucks that are presumed to be generating more heat? Once at operating temperature with the thermostat all the way open, a 160 or 180 that's all the way open and is the same diameter should yeild the same amount of coolant flow, with perhaps the 160 yeilding MORE cooled water through, since it stays open longer, shutting only once the water has dropped back down below 160. Full flow is full flow, and once you're at 200+, they both flow the same, since they're both open. Does that make sense to you? I don't know. Since the stock unit corrected things, perhaps this isn't all that important to research anymore. Did I mention that Chrysler was known for great engineering and that putting things back to how they came sure does seem to solve a lot of problems? Kenyon Wills __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com ----------------- http://www.imperialclub.com ----------------- This message was sent to you by the Imperial Mailing List. Please reply to mailing-list@xxxxxxxxxxxxxxxx and your response will be shared with everyone. Private messages (and attachments) for the Administrators should be sent to iml.webmonster@xxxxxxxxx To UN-SUBSCRIBE, go to http://imperialclub.com/unsubscribe.htm