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Thermostat installation on an 87 Ford Mustang 5.0

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Drain the coolant of the radiator or pull the lower radiator hose off. Follow the upper radiator hose to the engine where the distributor is. The hose clamps on to the thermostat housing right there. Remove the big hose and removed the little hose and remove two half inch bolts holding the housing to the intake manifold remove the thermostat in clean the gasket surface with a putty knife and a wire brush. Install the thermostat and then gasket using shellacke or sealants. Reinstall bolts and hoses. Fill with coolant. Remove one of the heater hoses for the throttle body to vent the trap air out of the engine. Do this with the engine running then check the coolant level again. Good luck.

Posted on Jul 27, 2010


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1. Make sure the engine is cool.
2. Using a clean bucket disconnect the lower radiator hose and carefully drain around 1 gallon off coolant then reconnect hose.
3. Follow the upper radiator hose to the engine where it's connected to the gooseneck on the engine.
4. remove the 2 bolts holding the gooseneck and lift it up to remove the thermostat making a mental note on how it was installed.
5. Clean both sides of the gasket surfaces, install new thermostat in the same position it was removed and replace O ring(only use a Motorcraft replacement to avoid having fit issues) alternate tightening bolts until tight.
6. Refill radiatior to proper level.
7 Leaving the raditor cap off, start the car turn on the heater and let it warm up keeping an eye on the coolant level, it will go down once the air works it's way out of the cooling system.
8. Top off the system and tighten radiator cap. Check the coolant level several times during the week, there may still be some air left in the system.

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