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Changing thermostat in a 1995 BMW 318i?

Tools and Materials Needed:

- New thermostat

- Gasket for the thermostat housing

- Coolant

- Screwdriver

- Pliers

- Funnel

Instructions:

Step 1: Drain the Coolant

- Open the coolant drain valve: Remove the drain plug from the bottom or side of the radiator. Position a drain pan below the valve and allow all the coolant to drain out.

- Close the drain valve: Replace the drain plug once the coolant has completely drained.

Step 2: Remove the Thermostat Housing

- Locate the thermostat housing: It’s typically found near the top of the engine, usually on the front or side.

- Remove the housing bolts: Use a screwdriver or pliers to remove the bolts holding the thermostat housing in place.

- Take off the housing: Carefully remove the housing, paying attention to the gasket that sits between it and the engine block.

Step 3: Remove the Old Thermostat

- Pull out the old thermostat: It should come out easily, but be cautious as there might be some residual coolant.

- Clean the housing surface: Use a rag or brush to clean the housing surface where the thermostat was located. Ensure that all the old gasket is removed.

Step 4: Install the New Thermostat

- Place the new thermostat: Insert the new thermostat into the housing, ensuring it’s seated correctly.

- Fit the new gasket: Place a new gasket on the thermostat housing surface, making sure it fits snugly.

Step 5: Reinstall the Housing

- Replace the housing: Carefully put the thermostat housing back in place, ensuring the gasket is positioned properly.

- Secure the housing: Tighten the housing bolts to secure the housing in place.

Step 6: Refill the Coolant

- Open the radiator cap: Remove the radiator cap to add coolant.

- Pour in coolant: Slowly pour coolant into the radiator until it reaches the “FULL” mark indicated on the coolant reservoir or radiator cap.

- Replace the radiator cap: Once the coolant level has been reached, securely replace the radiator cap.

Step 7: Check for Leaks

- Start the engine: Run the engine for a few minutes to let the coolant circulate.

- Inspect for leaks: Check the thermostat housing area, hose connections, and radiator for any signs of leaks. If there’s a leak, tighten the connections or replace the faulty component.

Note: It's important to properly dispose of the old coolant, as it is toxic. Always refer to your vehicle’s repair manual or consult a professional mechanic if you’re unsure about any of the steps involved.