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Eric, Automotive Repair Shop Manager
Category: Ford
Satisfied Customers: 29725
Experience:  Automotive Repair Shop Manager, Technician
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How do I replace the thermostat on 1993 F150 V8

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Submitted: 8 years ago.
Category: Ford
Expert:  Eric replied 8 years ago.


Here are directions to replace the thermostat:

5.0L, 5.8L and 7.5L Engine

See Figures 2, 3, 4, 5, 6, 7 and 8

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Fig. 2: Unbolt the thermostat housing


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Fig. 3: Pull away the thermostat from the housing


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Fig. 4: Scrape the gasket material taking care not to gouge the aluminum mating surfaces


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Fig. 5: Thermostat spring always faces down in all engines


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Fig. 6: On gasoline engines, turn the thermostat CLOCKWISE to lock it into position on the flats in the outlet elbow


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Fig. 7: Thermostat positioning


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Fig. 8: Thermostat installation for the V8 engines


The gasoline-powered 5.0L and 5.8L engine thermostat is mounted vertically on the front of engine, the 7.5L engine thermostat is positioned vertically.

  1. Drain the cooling system below the level of the coolant outlet housing. Use the petcock valve at the bottom of the radiator to drain the system. It is not necessary to remove any of the hoses.

When draining the coolant, keep in mind that cats and dogs are attracted by ethylene glycol antifreeze and are quite likely to drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain the coolant into a sealable container. Coolant should be reused unless it is contaminated or several years old.

  1. Disconnect the bypass hoses at the water pump and intake manifold.

  2. Remove the bypass tube.

  3. Remove the coolant outlet housing retaining bolts, bend the hose and lift the housing with the hose attached to one side.

  4. Remove the thermostat and gasket from the intake manifold and clean both mating surfaces.

To install:

  1. For 5.0L and 5.8L engines, coat a new gasket with water resistant sealer and position it on the outlet of the engine. The gasket must be in place before the thermostat is installed. Install the thermostat with the bridge (opposite end of the spring) inside the elbow connection and the thermostat flange positioned in the recess in the manifold.

  2. For the 7.5L engine, install the thermostat in the recess, then coat the gasket with a water resistant sealer and position the gasket on top of the thermostat.

  3. Position the elbow connection onto the mounting surface of the outlet. Tighten the bolts to 18 ft. lbs. (24 Nm) on the 5.0L and 5.8L engines; 28 ft. lbs. (38 Nm) on the 7.5L engine.

  4. Install the bypass tube and hoses.

  5. Fill the radiator and operate the engine until it reaches operating temperature. Check the coolant level and adjust if necessary

Customer: replied 8 years ago.
Reply to Eric's Post: How many bolts housing to manifold? I can see two.If there are any on bottom side, this is going to be tough. please advise
Expert:  Eric replied 8 years ago.


2 bolts

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