How to check and replace a thermostat in a cooling system on Saturn LS and LS1?

Before replacing the thermostat, inspect the coolant level, drive belt tension, and temperature gauge operation. In 2004 models, remove the exhaust manifold heat shield, drain the coolant, remove the thermostat cover, and replace the thermostat. For V6 models, remove the intake manifold, and disconnect the radiator hose.

Genuine Saturn LS1 Thermostat

Engine Coolant Thermostat

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2 Thermostats found

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Saturn LS1 Thermostat Assembly, Engine Coolant
Part Number: 12622410
- Other Name: THERMOSTAT, Engine Coolant Temperature; Thermostat
- Replaces: 21018811, 90537453, 55350941, 12615097
$75.03 MSRP: $152.26
You Save: $77.23 (51%)

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Fits the following Vehicles:
2000 Saturn LS1 | LS, LS1, LS2, LW1, LW2 | 4 Cyl 2.2L
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Saturn LS1 Housing Asm,Engine Coolant Thermostat
Part Number: 90537819
- Other Name: HOUSING, Engine Coolant Thermostat; Inlet Assembly
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Fits the following Vehicles:
2000 Saturn LS1 | LS, LS1, LS2, LW1, LW2 | 4 Cyl 2.2L
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Saturn LS1 Thermostat Parts Questions & Answers

Thermostat Assembly, Engine Coolant
12622410
Q: How to check and replace a thermostat in a cooling system on Saturn LS and LS1?
A: Before replacing the thermostat, inspect the coolant level, drive belt tension, and temperature gauge operation. In 2004 models, remove the exhaust manifold heat shield, drain the coolant, remove the thermostat cover, and replace the thermostat. For V6 models, remove the intake manifold, and disconnect the radiator hose.