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How to Install a Thermostat on a 1999 Saturn

The thermostat on your 1999 Saturn is located on the lower front of the engine on the passengers side, just above the water pump. The thermostat controls the flow of the coolant thats needed to maintain the proper operating temperature of the engine. As the engine temperature rises, the thermostat automatically opens and allows coolant into the engine. A malfunctioning thermostat will fail to open, preventing coolant from entering the engine and causing the engine to overheat. Replacing the thermostat is a fairly simple process that requires only a few tools.

Instructions

Removing the Thermostat

1

Allow the engine to cool. Put on your safety glasses, raise the hood and remove the radiator cap to release the pressure in the hose. Disconnect the negative battery cable for added safety.

2

Remove the carburetor air cleaner and filter unit to provide for better access to the thermostat. Unscrew the cover bolt in the center cap with your hand.

3

Place a clean bucket directly under the drain bolt on the bottom of the radiator.

4

Slide underneath the Saturn on your back and loosen the drain bolt using a socket wrench. Drain just enough coolant to clear out the upper radiator hose and tighten the drain bolt. Check to see if it is clear by squeezing the hose and feeling for any remaining coolant. Repeat this step until the upper radiator hose is empty.

5

Detach the spring-type hose clamp from the upper radiator hose where it attaches to the thermostat housing. Squeeze the clamp using channel-lock pliers and slide it off of the cover. The end that connects to the radiator can remain attached.

6

Remove the two mounting bolts that secure the thermostat housing cover to the engine block, using the socket wrench. Tap the cover using a rubber mallet to break the seal. Remove the thermostat. Scrape off the old gasket using a razor, being caul not to allow any gasket debris to fall into the engine.

Installing the Thermostat

7

Test the new thermostat before installing to confirm that its working properly. Fill a deep bowl with very hot tap water. Grab the thermostat upright using the channel-lock pliers and hold it in the hot water, making sure the entire thermostat is submerged. The lower spring side of the thermostat should open immediately, indicating that it is working correctly.

8

Apply a small amount of gasket adhesive to the new gasket using your finger. Place the gasket directly onto the engine block at the thermostat opening. Be sure that the mounting holes are correctly aligned so that the thermostat will seat correctly.

9

Install the new thermostat with the spring side inserted into the engine, and caully reposition the housing cover. Do not to move or disturb the gasket. Secure the housing cover on the engine block with the two mounting bolts.

10

Reposition the carburetor air cleaner and filter. Reconnect the upper radiator hose to the thermostat cover. Secure the hose in place with the spring clamp. Inspect the hose for bulging and replace it if necessary.

11

Reconnect the negative battery cable and start the engine. Pour the drained coolant back into the radiator and allow the engine to idle for several minutes. Inspect the thermostat and hose connections for leaks.