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  2. sku: 22567407815374633
  3. AUTOHAUX 135-150

X-AUTOHAUX 135-150 Thermostat Kit 703820910213 V-6 175 200HP 143

fits model: Marine. make: Mercury.

135-150 X Autohaux 703820910213 2pcs Marine Thermostat Kit For Mercury V-6 175 200hp 143 Degree

( Brand: X-autohaux ), ( Part Type: Thermostat ), ( Fitment 1: For Mercury Marine V-6 135-150hp S/n A904646 Later ), ( Fitment 2: For Mercury Marine V-6 175 Hp S/n C100861 And Late ), ( Fitment 3: For Mercury Marine V-6 200 Hp S/n 6435503 And Late ), ( Fitment 4: Not Fit For Dfi Optimax Motors. ), ( Shell Color: Black Brass Tone ), ( Material: Plastic, Metal ), ( Package Content: 2 Pcs Marine Boat Thermostat Kit ), ( Net Weight: 65g ), ( California Prop 65 Warning: Cancer And Reproductive Harm Www.p65warnings.ca.gov ), ( UPC: 703820910213 )

Review X AUTOHAUX 2pcs Thermostat Kit Mercury V-6 175 200hp 143 Degree fits MARINE

The **Autohaus 703820910213 Marine Thermostat Kit** is a precision-engineered solution designed exclusively for Mercury V-6 marine engines producing between **135 to 200 horsepower**, including the **143-series models**. This high-performance thermostat kit ensures optimal engine cooling efficiency, protecting critical components from overheating while maintaining peak performance under demanding marine conditions. Crafted from durable, corrosion-resistant materials, the thermostat is engineered to withstand the harsh saltwater environment, prolonged exposure to UV rays, and the thermal cycling inherent in marine applications. The kit includes a **high-quality thermostat with a precisely calibrated spring mechanism**, allowing for consistent temperature regulation within the engine s cooling system. This ensures that the engine operates within its ideal temperature range, reducing wear on seals, gaskets, and internal components while maximizing fuel efficiency and power output. The thermostat s robust construction and tight sealing properties prevent coolant leaks, which are particularly critical in marine engines where water ingress can lead to catastrophic failure. Whether installed in a high-performance cruiser, a fishing vessel, or a workboat, this thermostat kit delivers reliable performance, extending the lifespan of the Mercury V-6 engine and minimizing the risk of costly repairs. Its compatibility with a wide range of displacement models from the **135hp to the 200hp variants** makes it an essential upgrade for marine enthusiasts seeking dependable cooling performance in even the most challenging conditions.

**Pros and Cons of buying a Autohaux 703820910213 Marine Thermostat Kit for Mercury V-6 Engines (135-150, 175, 200 HP, 143 Series)**

### **Pros:**

1. **Compatibility** This thermostat kit is specifically designed for Mercury V-6 engines in the 143 series, covering the 135-150 HP, 175 HP, and 200 HP models. This ensures a proper fit without modification, reducing the risk of installation errors.

2. **Quality Materials** Autohaux is a reputable brand known for manufacturing marine components with durable materials. The thermostat is likely built to withstand the demands of marine engine operation, including heat cycling and pressure fluctuations.

3. **Performance Optimization** A properly functioning thermostat helps maintain optimal engine temperature, improving fuel efficiency, reducing wear on internal components, and preventing overheating critical for long-term engine health.

4. **Easy Installation** Since this is a direct replacement kit, it should be straightforward to install, especially if you have basic mechanical skills or access to a marine mechanic. The kit typically includes all necessary gaskets and seals.

5. **Cost-Effective Solution** Replacing a faulty thermostat is often cheaper than dealing with engine damage caused by overheating. This kit provides a reliable, budget-friendly upgrade compared to OEM parts.

6. **Preventative Maintenance** If your engine is running hot or showing signs of thermostat failure (e.g., inconsistent temperature readings, coolant leaks), replacing it proactively can prevent costly repairs down the line.

7. **Warranty Coverage** Autohaux products often come with warranties, offering some peace of mind in case of defects or premature failure.

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### **Cons:**

1. **Potential Counterfeit Concerns** Some aftermarket parts, including those from lesser-known sellers, may be counterfeit or of inferior quality. Ensure you purchase from a trusted retailer (e.g., official dealers, reputable online marketplaces) to avoid receiving substandard or fake parts.

2. **Mismatched Specifications** While this kit is designed for the specified Mercury V-6 engines, there is always a slight risk of variation in thermostat size or pressure rating if the engine has been modified or if the original thermostat was a custom part. Double-check compatibility before purchasing.

3. **Installation Challenges** If the thermostat housing is corroded, damaged, or difficult to access (common in older engines), installation might require additional effort, tools, or even replacement of the housing. This could add unexpected labor costs.

4. **Limited Customization** This is a standard replacement kit, meaning you cannot adjust the thermostat s opening temperature or pressure. If your engine requires a specific thermostat setting (e.g., for racing or extreme conditions), this kit may not offer that flexibility.

5. **Compatibility with Aftermarket Cooling Systems** If your engine has been fitted with an aftermarket cooling system (e.g., larger radiator, custom water pump), the stock thermostat may not perform optimally. In such cases, a thermostat with a different pressure rating might be needed.

6. **Potential for Improper Sealing** If the gaskets or seals in the kit are not properly installed or are of poor quality, they could leak, leading to coolant loss and overheating. Always inspect the seals during installation.

7. **No Long-Term Performance Guarantee** While Autohaux parts are generally reliable, no component lasts forever. The thermostat may still fail after extended use, especially if the engine is subjected to harsh conditions (e.g., saltwater corrosion, extreme temperatures).

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### **Conclusion:**

The **Autohaux 703820910213 Marine Thermostat Kit** is a solid choice for Mercury V-6 engines in the 143 series, offering a balance of compatibility, quality, and affordability. It is particularly beneficial for owners experiencing overheating issues or those performing routine maintenance. However, it is not without potential drawbacks, such as the risk of counterfeit parts, installation challenges, or compatibility issues with heavily modified engines.

If your engine is running normally and the thermostat is not failing, there is little urgency to replace it. However, if you are experiencing overheating, inconsistent temperature readings, or coolant leaks, this kit is a practical and cost-effective solution to restore proper engine cooling.

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### **Recommendation:**

1. **Verify Compatibility** Confirm that your specific Mercury V-6 engine model (including any modifications) matches the kit s specifications. Check the engine s serial number or consult your engine manual if unsure.

2. **Purchase from a Trusted Source** Buy the kit from an authorized Autohaux dealer or a well-reviewed online retailer (e.g., Amazon, West Marine, or a marine parts specialist) to avoid counterfeit products.

3. **Inspect the Kit Upon Arrival** Open the packaging to ensure all components (thermostat, gaskets, seals) are included and appear new and undamaged.

4. **Follow Installation Instructions Carefully** If you are not experienced with marine engine repairs, consider having a professional mechanic install the thermostat. Improper installation can lead to leaks or ineffective cooling.

5. **Monitor Engine Performance Post-Installation** After replacing the thermostat, monitor your engine s temperature gauge and coolant levels. If overheating persists or new issues arise, investigate further (e.g., water pump, radiator, or cooling system leaks).

6. **Consider Upgrading if Needed** If your engine is heavily modified or operates in extreme conditions, research higher-quality or custom thermostats that may offer better performance (e.g., those with adjustable pressure settings).

**Final Verdict:** For most Mercury V-6 143 series engine owners facing thermostat-related issues, the **Autohaux kit is a reliable and recommended replacement**. It provides a cost-effective way to restore proper engine cooling with minimal risk, provided you take precautions to ensure authenticity and proper installation.

Details:

Specifications:Type: Thermostat Kit. For Mercury Marine V-6 135-150HP S/N A904646 and later. For Mercury Marine V-6 175 HP S/N C100861 and later. This is non-oem product, accessory only.

Features of Thermostat Comp Water Come with reliable heavy spring, good abrasion resistance, reduce shock and ensure thermostat work well. 2pcs Marine Thermostat Kit for Mercury V-6 135-150 175 200HP 143 Degree: Fitment of 143F Thermostat NOT fit DFI optimax motors. Material: Metal, Plastic. Document Fitment of 143F Thermostat NOT fit for DFI optimax motors.

Help to fix boat engine problems like overcooking, overheating, hiccups, coolant leak, provide a mouthful driving. Fitment Type: Direct Replacement. Color: Black Brass Tone.

part #: 703820910213 prices

  • $16.60-$28.90

specifications ouboaen:

  • for models: Marine
  • for makes: Mercury
  • brand: X-autohaux
  • part type: Thermostat
  • fitment 1: For Mercury Marine V-6 135-150hp S/n A904646 Later
  • fitment 2: For Mercury Marine V-6 175 Hp S/n C100861 And Late
  • fitment 3: For Mercury Marine V-6 200 Hp S/n 6435503 And Late
  • fitment 4: Not Fit For Dfi Optimax Motors.
  • shell color: Black Brass Tone
  • material: Plastic, Metal
  • package content: 2 Pcs Marine Boat Thermostat Kit
  • net weight: 65g
  • california prop 65 warning: Cancer And Reproductive Harm Www.p65warnings.ca.gov
  • upc: 703820910213

general ouboaen:

  • condition: New
  • Boat Parts > Outboard Engines Components > Other

returns ouboaen:

  • time: 30 Days
  • paid by: Seller
  • policy: Returns Accepted

offer ouboaen:

  • started: March 11, 2026
  • options: Ship-to-home
  • sold: 0
  • availability: In Stock

payments ouboaen:

  • wallet: Apple-pay
  • other
  • credit card: Discover

seller ouboaen:

  • rating: 97.9%
  • # reviews: 581
  • city: Bordentown, New Jersey

shipping ouboaen:

  • service: Standard
  • type: Fixed
  • cost: $0.00
  • transit: 2-6 Days
  • class: Standard
for models: marine, for makes: mercury, part type: thermostat, fitment 1: for mercury marine v-6 135-150hp s/n a904646 later, fitment 2: for mercury marine v-6 175 hp s/n c100861 and late, fitment 3: for mercury marine v-6 200 hp s/n 6435503 and late, fitment 4: not fit for dfi optimax motors., shell color: black brass tone, package content: 2 pcs marine boat thermostat kit, net weight: 65g, california prop 65 warning: cancer and reproductive harm www.p65warnings.ca.gov,
category: boat parts > outboard engines components, material: plastic, metal, sku: 22567407815374633,
X-autohaux 135-150 Is Similar To:
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3 offers $16.60–$28.90 USD
  • New. Offer #1 priced at $16.60 + $0.00 shipping estimate = $16.60* total. Fitment of 143F ThermostatNOT fit for DFI optimax motors.FREE SHIPPING
  • New. Offer #2 priced at $17.06 + $0.00 shipping estimate = $17.06* total. FREE SHIPPING
  • New. Offer #3 priced at $28.90 + $0.00 shipping estimate = $28.90* total. Thread Size: 1/8" NPT. Universal Fit: fit for most engine blocks, radiators, manifold or water outlets.FREE SHIPPING

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