How to Replace the Thermostat in a 1991 Ford Ranger
If engine sludge has built up around the thermostat in your 1991 Ford Ranger, you have noticed that the vehicle has stopped producing heat inside of the cabin. The reason the truck does not produce heat is that the Ranger is allowing fluid to flow through the engine unrestricted. A thermostat replacement will allow the engine to properly regulate the amount of fluid going through the engine and restore the truck’s ability to warm the cabin again.
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Instructions
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1
Locate the thermostat cover by tracing the top radiator hose to the location where it connects to the engine. The metal housing that the hose connects to is the thermostat cover.
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2
Remove the thermostat cover by removing the two bolts that hold it onto the intake manifold of the Ford Ranger, then pulling upward on it.
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3
Pull the old thermostat out of the intake manifold of the Ranger and replace it with a new one. The thermostat must be orientated correctly. The end marked “up” sticks out of the engine.
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4
Remove the old thermostat gasket and replace it with a new one. The gasket has holes cut into it for the thermostat cover bolts to go through. Position the holes in the gasket so they line up with the holes in the intake manifold.
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5
Bolt the thermostat cover back onto the intake manifold of the Ranger.
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Tips & Warnings
It is common to use RTV gasket sealer in place of the thermostat gasket. This is a personal preference and is not needed to ensure a good seal between the thermostat cover and the intake manifold.
References
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