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RJ, Ford Technician
Category: Ford
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Experience:  Ford senior master and ase master certified 19years Ford dealership experience
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1993 Ford F-350: the thermostat located..7.3 Liter..Liter Diesel

Resolved Question:

Where is the thermostat located in a 1993 Ford F-350 7.3 Liter Diesel, and how do you change it out?
Submitted: 7 years ago.
Category: Ford
Expert:  RJ replied 7 years ago.
THe thermastat is located in the upper radiator hose housing on the engine i will attach the info from the sh
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1993 Ford Truck F 350 2WD Pickup V8-7.3L DSL

Vehicle Level Engine, Cooling and Exhaust Cooling System Thermostat Service and Repair
Service and Repair

NOTE: The specified thermostat does not contain an internal bypass, since the bypass is located in the cylinder block. Whenever the thermostat is replaced, it Is mandatory that only Motorcraft E5TZ-8575-C or Navistar(NNN) NNN-NNNNC1 thermostat be installed.

Thermostat Assembly

  • Do not attempt to repair the thermostat. It should be replaced if it is not operating properly.
  • Check the thermostat before installing it.


  1. Disconnect ground cables from both batteries.
  2. Drain coolant from radiator until coolant level is below thermostat.
  3. Remove accessory drive belt.
  4. Disconnect alternator electrical connectors and remove alternator.
  5. Remove the water outlet housing attaching bolts. Bend the radiator upper hose upward and remove the thermostat and gasket.


  1. Clean the water outlet housing gasket surfaces. Coat a new outlet housing gasket with Perfect Seal Sealing Compound BA-19554-A (ESR-M18P2-A) or equivalent. Position the water outlet housing gasket on crankcase opening.
  2. Install thermostat in crankcase opening with the copper pellet or element toward engine and the thermostat flange positioned in the recess. If thermostat is improperly installed, it will cause a restricted flow of coolant.
  3. Position the water outlet housing against the crankcase. Install and tighten the attaching bolts to 27 Nm (20 ft. lb.) .
  4. Install alternator and connect electrical connectors.
  5. Install accessory drive belt.
  6. Fill and bleed the cooling system.
  7. Connect ground cables to both batteries.
  1. Operate the engine until normal operating temperature is reached, then check the coolant level. Inspect cooling system for leaks.



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