CADILLAC 671-00389 Coolant Reservoir

( Genuine Oem: Yes ), ( Ipn: 671-00389 ), ( Manufacturer Warranty: 6 Month )

Review CADILLAC Coolant Reservoir fits CT6 2016–2019

The **Cadillac 671-00389 Coolant Reservoir (16-19 CT6)** is a precision-engineered component designed to maintain optimal cooling system performance in Cadillac s high-performance CT6 models from the 2016 through 2019 production years. Crafted from durable, high-grade **polypropylene**, this reservoir is engineered to withstand the thermal and pressure demands of a modern V8 engine, ensuring long-term reliability and leak resistance. Its sleek, integrated design features a **clear, tamper-resistant cap** with a pressure relief valve, allowing for easy monitoring of coolant levels while preventing overfilling and potential system damage. The reservoir s robust construction minimizes the risk of cracking or warping under extreme temperatures, a critical factor in maintaining engine efficiency and preventing overheating in demanding driving conditions. Compatible exclusively with **Cadillac s proprietary coolant (OEM Dex-Cool or equivalent),** this reservoir is a direct-fit replacement for the original equipment part, ensuring seamless integration with the CT6 s advanced cooling infrastructure. Whether used for routine maintenance or as a direct replacement during repairs, this reservoir upholds Cadillac s commitment to performance and durability, providing drivers with confidence in their vehicle s cooling system under all operating conditions.

### **Pros and Cons of buying a Cadillac 671-00389 Coolant Reservoir (2016-2019 CT6)**

1. **OEM Quality and Fit** This is a genuine Cadillac replacement part, ensuring a perfect fit and compatibility with the 2016-2019 CT6 engine bay. Aftermarket parts may not align as precisely, potentially leading to leaks or improper function.

2. **Reliability and Durability** Cadillac s original equipment parts are designed to meet strict manufacturing standards, reducing the risk of premature failure compared to cheaper alternatives.

3. **Warranty Coverage** Purchasing from an authorized dealer or a reputable online retailer often includes a warranty, providing peace of mind in case of defects.

4. **Prevents Coolant System Issues** A faulty coolant reservoir can lead to overheating, coolant leaks, or even engine damage. Replacing it with an OEM part helps maintain proper coolant pressure and circulation.

5. **Long-Term Cost Savings** While the upfront cost may be higher than aftermarket options, OEM parts tend to last longer, reducing the need for frequent replacements.

1. **Higher Cost** Genuine Cadillac parts are more expensive than aftermarket alternatives. This can be a significant upfront expense, especially if purchasing from an official dealer.

2. **Limited Availability** Depending on the retailer, finding this specific part (671-00389) may require ordering from a specialty auto parts supplier, which could involve shipping delays.

3. **Potential Overkill for Minor Repairs** If the reservoir is only cracked or slightly damaged, some owners might consider a less expensive fix (e.g., sealing the crack) instead of a full replacement. However, this is not recommended for long-term reliability.

4. **Installation Complexity** While the replacement itself is straightforward, improper handling (e.g., not bleeding the cooling system properly) could lead to air pockets or leaks. Some owners may need professional installation, adding to the cost.

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The **Cadillac 671-00389 coolant reservoir (2016-2019 CT6)** is a high-quality, reliable replacement part that ensures proper function of your vehicle s cooling system. While it comes at a premium price compared to aftermarket options, its OEM quality, warranty, and long-term reliability make it a worthwhile investment especially for owners who prioritize durability and peace of mind. The potential risks (higher cost, shipping delays) are outweighed by the benefits of using a genuine part that fits perfectly and reduces the risk of future cooling system failures.

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- **Buy from an Authorized Dealer or Trusted Online Retailer** Ensure the part is genuine to avoid counterfeit or substandard replacements. Websites like **GM Parts Online, RockAuto, or local Cadillac dealerships** are reliable sources.

- **Verify Compatibility** Double-check that the part number (671-00389) matches your CT6 s engine configuration (e.g., 3.6L V6 or 2.0L Turbo) to avoid ordering the wrong reservoir.

- **Consider Installation** If you re comfortable with basic automotive repairs, replacing the reservoir is a manageable DIY job. If not, consult a mechanic to ensure proper bleeding of the cooling system post-installation.

- **Compare Prices** While OEM is ideal, compare prices across dealers and online stores to get the best deal without compromising quality.

**Final Verdict:** **Worth the investment** for long-term reliability, especially if you want to avoid cooling system issues in your CT6. The cost is justified by the part s performance and longevity.

Details:

CT6 16-18 2.0L. CT6 16-19 3.0L.

part #: 671-00389 price

• $65.72

specifications ocoosys:

• for models: Ct6
• for makes: Cadillac
• for years: 2016-2019
• genuine oem: Yes
• ipn: 671-00389
• manufacturer warranty: 6 Month

offer ocoosys:

• options: Ship-to-home
• quantity: 1
• availability: In Stock
• started: February 19, 2026
• sold: 0
• best offers: True

general ocoosys:

• condition: Used
• Car Truck Parts Accessories > Engine Cooling Components > Radiators

shipping ocoosys:

• transit: 5-11 Days
• class: Expedited
• service: USPS Priority Mail
• carrier: USPS
• cost: $0.00
• type: Fixed

payments ocoosys:

• other
• wallet: Paypal
• credit card: Mastercard

returns ocoosys:

• policy: Returns Accepted
• paid by: Seller
• time: 60 Days

seller ocoosys:

• rating: 98.9%
• city: Brownwood, Texas
• # reviews: 2817

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