Description

Sierra’s 18-3555 Thermostat fits 1998 and newer GM V-6 and V-8 engines with closed cooling. It is interchangeable with GLM 13040, Mallory 9-43001, 9-43016, Mercruiser Stern Drive 991551, 99155A1, 99155T2. It features a temperature rating of 143°F. Each Sierra product meets or exceeds the original equipment part it replaces.
Fits 1998 and newer GM V-6 and V-8 engines with closed cooling
Interchangeable with GLM 13040, Mallory 9-43001, 9-43016, Mercruiser Stern Drive 991551, 99155A1, 99155T2
Temperature Rating: 160°F
Each Sierra product meets or exceeds the original equipment part it replaces