Welcome Offer : Use Code WELCOME5 for 5% OFF your first order!
Free Shipping Across USA
Welcome Offer : Use Code WELCOME5 for 5% OFF your first order!
Free Shipping Across USA
Welcome Offer : Use Code WELCOME5 for 5% OFF your first order!
Free Shipping Across USA
Welcome Offer : Use Code WELCOME5 for 5% OFF your first order!
Free Shipping Across USA
Welcome Offer : Use Code WELCOME5 for 5% OFF your first order!
Free Shipping Across USA
Welcome Offer : Use Code WELCOME5 for 5% OFF your first order!
Free Shipping Across USA
Welcome Offer : Use Code WELCOME5 for 5% OFF your first order!
Free Shipping Across USA
Welcome Offer : Use Code WELCOME5 for 5% OFF your first order!
Free Shipping Across USA
Welcome Offer : Use Code WELCOME5 for 5% OFF your first order!
Free Shipping Across USA
Welcome Offer : Use Code WELCOME5 for 5% OFF your first order!
Free Shipping Across USA
- No EU import duties. - Ships within 3-5 business days. (USA) - Ships with 8-12 business days. (International)
⚠️ California Proposition 65 Warning : Some products sold on this website may expose you to chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.
For more information, visit www.P65Warnings.ca.gov.
Sierra's 18-3668 Thermostat Kit fits GM V-6 and V-8 engines with standard cooling ( 1983 and newer). The kit contains (1) 18-2552 Thermostat Gasket Cover, (1) 18-2553 Thermostat Gasket, (1) 18-2554 Thermostat Cover Gasket, (1) 18-2917 Thermostat Housing Gasket, (1) 18-3551 Thermostat, and (1) 18-7173 O-Ring. It is interchangeable with GLM 13390, Mallory 9-43150, and Mercruiser Stern Drive 807252Q4, 807252T4, 807252T7. Each Sierra product meets or exceeds the original equipment part it replaces.
Yes, we offer free standard shipping on all orders within the United States.
When will I receive my item?
Domestic orders typically arrive within 3-5 business days. Delivery times are estimated and may vary depending on your location, weather conditions, or other unforeseen factors.
Can I change or return my item?
We hope you love your purchase, but if you need to make a change or return your item, we’ve got you covered! You can initiate a return or exchange within 30 days of receiving your order. Please ensure the product is in its original condition and packaging. For more information on our return policy, please visit our Returns & Exchanges page.
Frequently Asked Questions
Q: What engines are compatible with the Sierra 18-3668 Thermostat Kit?A: The Sierra 18-3668 Thermostat Kit is designed to fit GM V-6 and V-8 engines with standard cooling systems manufactured from 1983 and newer.
Q: What components are included in the Sierra 18-3668 Thermostat Kit?A: The kit includes (1) 18-2552 Thermostat Gasket Cover, (1) 18-2553 Thermostat Gasket, (1) 18-2554 Thermostat Cover Gasket, (1) 18-2917 Thermostat Housing Gasket, (1) 18-3551 Thermostat, and (1) 18-7173 O-Ring.
Q: Is the Sierra 18-3668 Thermostat Kit interchangeable with other brands?A: Yes, the Sierra 18-3668 Thermostat Kit is interchangeable with GLM 13390, Mallory 9-43150, and Mercruiser Stern Drive models 807252Q4, 807252T4, and 807252T7.
Q: What is the temperature rating of the Sierra 18-3668 Thermostat?A: The Sierra 18-3668 Thermostat has a temperature rating of 142°F, ensuring optimal engine performance.
Q: How do I ensure proper installation of the Sierra 18-3668 Thermostat Kit?A: For proper installation, follow the manufacturer's guidelines provided with the kit, ensuring all gaskets are securely in place and that the thermostat is installed in the correct orientation.
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