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copy fomr George P: Cooling system parts circa 1975

Replacement thermostat

  • OEM-temp (192°F): Motorcraft RT-139 or Robertshaw 333-192
  • Lower-temp (180°F): Motorcraft RT-310 or Robertshaw 333-180


Note: The Robertshaw thermostats have been sold in the past by Stant, Interstate and Prestone using the 333-192 and 333-180 part numbers. The thermostats were also sold by Flow Kooler. The 333-180 thermostat was sold in Australia by Dayco under part number DT66A, and it was sold by Summit Racing under part number BRA-333-180. You should check, but it may not be available from any of those sources any longer. The thermostats have been hoarded by certain businesses specializing in Mustangs, 351C engines, etc. Whenever they become available they are sold out immediately.

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AND you need the correct radiator switch..fit for the thermosdat. I have RT 310 with the special ring for Cleveland!!! and Metzler 87..91 Cel swich at the radiator. Also the whole front wiring needs to go on relais. Happy to get you my (modified) drawings ..
Matthias  

As far as I know there has never been a problem in obtaining thermostats for the Cleveland, meaning those being manufactured with the “hat”.

The problem has been obtaining a “high flow” thermostat, with hat, for the Cleveland, which was the style originally used by Ford.

After Flowkooler stopped making their “hatted” high flow version, Marlin was the first to meet the demand for the correct high flow style of thermostat, which he created by machining the hat and attaching it to a high flow thermostat. 

If you do not know the difference between high flow and standard flow I’m sure a search of this forum will find comparative photographs in more than one of the multiple threads on this issue.

Larry

Last edited by lf-tp2511

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