Sierra 18-3666 Thermostat Kit
- Brand:
- Sierra
- Part no:
- 18-3666
Where to buy
View on Amazonpaid link
The Sierra 18-3666 is a thermostat kit that is also labelled with the numbers 875580-3 and 55-103. No opening temperature, contents or engine fitment are stated for it, so there are no further figures to give here. Compare those numbers with the kit you are replacing before relying on it.
Our take
The 875580-3 and 55-103 numbers shown with the 18-3666 give you cross-references to compare against the kit on your engine. No opening temperature or fit is stated, so those numbers are what you have.