Question about 1991 Mercury Capri

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How do i change the thermostat on a 1991 capri?

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You'll need a philips screwdriver, flat screwdriver, and a 12mm open end wrench. Buy a new thermostat and gasket from your local auto parts store. Used the philips screwdriver to loosen the hose clamps from both ends of the air intake. Remove the air intake and set aside so you have room to get to the thermostat housing. Make sure you have a drip pan under the car to catch any spilled coolant. Follow the top radiator hose on the right hand side down to where it connects to the engine. Use the flat head screwdriver to loosen the hose clamp and remove the end of the radiator hose attached to the thermostat housing. You can lift the open end of the hose up and off to the side so it doesn't leak coolant. There is a bolt on the top of the thermostat housing and a nut on the bottom towards the back. Use your 12mm wrench to remove the nut from the bottom of the housing and the bolt from the top. Once you have removed the bolt and the nut, you can remove the thermostat housing. Remove the old thermostat and the old gasket. Clean up the surfaces of the housing making sure there are no remnants of the old gasket. Put the new thermostat in place. Install the new gasket (some have adhesive on them to hold them in place during installation. If yours doesn't, you can use a little bit of grease or gasket adhesive). Reinstall the thermostat housing. Replace the bottom nut and the top bolt. Reattach the radiator hose to the thermostat housing and tighten the hose clamp. Replace the air intake and tighten the hose clamps. Fill your radiator with 50/50 mix of water and anti-freeze. Start the car and turn on the heater. Let it run to clear any air from the system. Later, when the car has had time to cool down, check the coolant level and fill as necessary. Cost: Thermostat $4.99, Gasket $.99. Time invested: about 1 hour.

Posted on Apr 25, 2010

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