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