Sierra Thermostat Kit 18-3621
- Brand:
- Sierra
- Part no:
- 18-3621
Where to buy
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This is the Sierra 18-3621 thermostat kit. Its application is given as 3.0L GS engines of model years 1996 to 1999, with the LK, BY and WT codes. No opening temperature or list of kit parts is given, so check Sierra's catalog for those details before fitting it.
Our take
The 18-3621 is tied to 3.0L GS engines from model years 1996 to 1999, a narrow window, so check your engine's year and model before relying on it. No opening temperature is given.