Old or New Thermostat

[james Callahan]

I have the new type in my 1950 dodge coronet, I was told that I need the old "bellows" type with the four by-pass ports.

And I have the new water pump to the one with ball bearing, not the old type with the grease nipple, but on the new water pump, the back cover plate is off set a little from the hole in the water pump the too hole do not line up even, I was told that would not hurt any thing?

any comment

Thank You

James Callahan

[Don Coatney]

James;

The difference in an internal and external by-pass system is the backing plate on the water pump. Pictured below is a external water pump (the blue one). Use of this pump requires a short hose between the thermostat gooseneck and the top of the water pump (picture # 2 below). Internal by-pass systems look like picture #3 below and do not have the short hose. What system do yoiu have? Follow this thread for more information.

http://www430.pair.com/p15d24/mopar_forum/showthread.php?t=5810&highlight=thermostat

[Norm's Coupe]

My water pump is like Don's and it does not have a grease fitting to grease it either. I use the old type thermostat. They are available at NAPA. Had a bubble wrap store try to sell me the new type though before I found the right type at NAPA.