Mercury MerCruiser Thermostat – 853213001
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You have 30 days to request a return. All sale items are final sale.
The Mercury MerCruiser Thermostat 853213001 is a genuine OEM cooling system component designed to regulate engine temperature and maintain optimal operating conditions in MerCruiser marine engines.
By controlling coolant flow through the engine, the thermostat ensures proper warm-up and prevents overheating, improving efficiency and protecting internal engine components. OEM construction guarantees exact fitment and reliable performance in harsh marine environments.
This thermostat has been superseded to updated part number 853213002, which serves as the current replacement.
Key Features
- Genuine Mercury MerCruiser OEM part
- Maintains proper engine operating temperature
- Ensures efficient coolant flow
- Direct replacement fit and function
- Designed for marine corrosion resistance
Engine Compatibility
Mercury MerCruiser Engines
Used across various:
- V6 MerCruiser engines
- V8 MerCruiser engines
- Inboard and sterndrive cooling systems
➡️ Common in GM-based marine engines (4.3L, 5.0L, 5.7L, 7.4L applications – verify by serial)
Serial Number Fitment Notice
Fitment depends on:
- Engine model and year
- Cooling system configuration
- Serial number range
⚠️ Always confirm compatibility using your engine serial number before ordering.
Specifications
- Part Number: 853213001
- Type: Engine thermostat
- Function: Regulates coolant temperature
- Material: Marine-grade brass & stainless construction
What’s Included
- Thermostat (gasket sold separately unless specified)
When This Part Needs Replacement
Replace the thermostat if you notice:
- Engine overheating
- Engine running too cold
- Erratic temperature readings
- Poor fuel efficiency
Installation Notes
- Replace gasket or seal during installation
- Ensure correct orientation of thermostat
- Inspect housing for corrosion or buildup
- Test system after installation
Alternate / Superseded Part Numbers
OEM Cross References
- Mercury / MerCruiser: 853213001
- Superseded by: 853213002
Shipping
Shipping: Ships same or next day for fast Canada wide shipping. ⚓
💡 Parts Desk Insight
Thermostats are cheap insurance—if you're already into the cooling system, replace it. Most failures show up as running too cold, not overheating 👍*not exactly as shown
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.