Sierra 18-3555 MerCruiser 160°F Thermostat
- Brand:
- Sierra
- Part no:
- 18-3555
Where to buy
View on Amazonpaid link
Specifications
- Opens at
- 160°F
This is the Sierra 18-3555 thermostat, a replacement for MerCruiser sterndrives with a 160°F temperature rating. It is listed for GM V-6 and V-8 engines from 1998 on that have closed cooling. Sierra also names GLM, Mallory and MerCruiser numbers it is interchangeable with, which helps when cross-checking an old part.
Our take
A 160°F rating and fitment for 1998 and newer GM V-6 and V-8 engines with closed cooling define the 18-3555. If your engine is older or lacks closed cooling, it is outside the listed fitment.