DELPHI SX-1551 Coolant Temperature Sensor 5.7L

( Brand: Delphi ), ( Manufacturer Part Number: SX-1551 ), ( Manufacturer Warranty: 1 Year / 12, 000 Miles ), ( Ipn: C160 82-58 ), ( Placement On Vehicle: Belts Cooling Sensors ), ( Compatible Model: C20 Suburban ), ( Compatible Year: 1986 1985 ), ( Core Charge: Free No Core Charge ), ( Type: Engine Coolant Temperature Sensor ), ( Universal Fitment: Direct Replacement ), ( Bundle Description: 1 Pc Genuine Delphi Engine Coolant Temperature Sensor )

Review DELPHI Coolant Temperature Sensor Chevrolet 5.7l Ca fits SUBURBAN C20 1985–1986

The Delphi SX-1551 Coolant Temperature Sensor is a precision-engineered, high-performance replacement part designed specifically for the 1985 and 1986 Chevrolet C20 Suburban equipped with the legendary 5.7-liter V8 engine, commonly known as the "Big Block" or "350" configuration. This sensor is a critical component of the vehicle s engine management system, responsible for monitoring the temperature of the coolant in the engine block, providing real-time data to the engine control module (ECM) to optimize fuel delivery, ignition timing, and overall engine performance. Crafted from durable materials, the SX-1551 features a robust stainless steel housing with a threaded connection that ensures a secure and leak-free fit into the engine s coolant passage. The sensor s thermistor element, a temperature-sensitive resistor, accurately measures fluctuations in coolant temperature, converting them into electrical signals that the ECM interprets to maintain optimal operating conditions. Whether your Suburban is used for daily commuting, weekend adventures, or heavy-duty towing, this sensor delivers reliable performance under varying thermal loads, helping to prevent overheating, improve fuel efficiency, and extend the lifespan of your engine. Its direct compatibility with the 1985-1986 model year ensures a seamless installation with no modifications required, while its OEM-level quality guarantees consistent accuracy and longevity, making it an essential upgrade for any enthusiast or owner seeking to maintain peak engine health.

### Pros and Cons of Buying a Delphi SX-1551 Coolant Temperature Sensor for a 1985-1986 Chevrolet C20 Suburban (5.7L V8)

1. **Direct Fitment** The Delphi SX-1551 is designed as an OEM replacement for the coolant temperature sensor (CTS) used in the 5.7L V8 engines from the mid-1980s, including the C20 Suburban. This means it should align perfectly with the engine bay wiring harness and mounting location without requiring modifications.

2. **Reliability and Quality** Delphi is a well-known automotive parts manufacturer with a reputation for producing durable sensors. The SX-1551 is built to meet OEM specifications, reducing the risk of premature failure compared to aftermarket knockoffs.

3. **Compatibility with Modern Diagnostics** Since Delphi parts are designed to meet industry standards, the sensor should work seamlessly with modern OBD-I scanners (like those for older GM vehicles) and avoid triggering false error codes unrelated to the sensor itself.

4. **Ease of Installation** The sensor is straightforward to replace, requiring only basic tools (socket wrench, anti-seize compound, and possibly a drain pan if draining coolant). No major disassembly is needed.

5. **Widely Available** Delphi parts are stocked by most auto parts retailers (AutoZone, O Reilly, RockAuto, etc.), making it easy to purchase and return if necessary.

6. **Prevents Engine Issues** A faulty coolant temperature sensor can lead to inaccurate gauge readings, poor fuel economy, rough idling, or even overheating. Replacing it with a known-good unit can restore proper engine operation and prevent further damage.

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1. **Cost** The Delphi SX-1551 is a premium-priced sensor, typically ranging between **$20 $40**, depending on the retailer. While this is reasonable for an OEM-quality part, it may be more expensive than generic aftermarket alternatives (which can sometimes be found for under $10).

2. **Potential Overkill for Minor Issues** If the sensor is failing intermittently or the issue is related to wiring, harness damage, or a failing ECM, replacing just the sensor may not fully resolve the problem. A diagnostic scan (e.g., checking for P0115, P0116, or P0117 codes) is advisable before purchasing.

3. **Limited Longevity Guarantee** While Delphi parts are durable, they are not immune to wear. In high-mileage vehicles or those with coolant system issues (e.g., leaks, contamination), the sensor may fail again within a few years. Some aftermarket sensors offer longer warranties or better long-term reliability.

4. **Mixed Reviews on Specific Fit** A few owners report that the Delphi sensor may not fit *exactly* as snugly as the original, requiring careful threading or the use of anti-seize compound to prevent leaks. Improper installation could lead to coolant leaks or sensor loosening over time.

5. **Alternative Options Exist** There are other high-quality sensors (e.g., ACDelco, Motorcraft, or reputable aftermarket brands like Bosch or NGK) that may offer similar performance at a slightly lower cost. Researching these alternatives could yield a better price-to-quality ratio.

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The **Delphi SX-1551 is a solid choice** for replacing the coolant temperature sensor in a 1985 1986 Chevrolet C20 Suburban with a 5.7L V8, especially if you prioritize reliability, direct fitment, and brand reputation. It strikes a balance between quality and compatibility, making it a practical OEM replacement. However, it is not the *only* option, and alternatives may be worth considering if budget is a concern.

- **Verify the exact sensor location** (some 5.7L engines use slightly different sensors; ensure the Delphi part matches your vehicle s application).

- **Check for error codes** with a scanner to confirm the sensor is the root cause (e.g., P0115/P0116 codes).

- **Compare prices** with other OEM or high-quality aftermarket sensors (e.g., ACDelco 214-1050 or Bosch 0261906393).

If the sensor is confirmed faulty and you value brand reliability, the Delphi SX-1551 is a **recommended purchase**. If cost is a major factor, explore other reputable options while ensuring they meet your vehicle s specifications.

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- You want an OEM-quality, direct-fit sensor with minimal risk of fitment issues.

- You ve confirmed the sensor is faulty via diagnostic codes.

- You re willing to pay a slightly higher price for reliability.

- You find a similarly rated sensor (e.g., ACDelco) at a lower price.

- You suspect wiring or ECM issues may also contribute to the problem.

- You re comfortable with aftermarket parts and want to save money.

In most cases, the Delphi sensor will perform well and justify its cost for the longevity and peace of mind it provides.

Details:

Delphi Coolant Temperature Sensor for 1985 - 1986 Chevrolet C20 Suburban 5.7L ca: Status: In Stock.

part #: sx1551 prices

• $51.28-$187.21

specifications ocoosys:

• for models: C20, Suburban
• for makes: Chevrolet
• for years: 1985-1986
• brand: Delphi
• mpn: Sx-1551
• manufacturer warranty: 1 Year / 12, 000 Miles
• ipn: C160 82-58
• placement on vehicle: Belts Cooling Sensors
• compatible model: C20 Suburban
• compatible year: 1986 1985
• core charge: Free No Core Charge
• type: Engine Coolant Temperature Sensor
• universal fitment: Direct Replacement
• bundle description: 1 Pc Genuine Delphi Engine Coolant Temperature Sensor

offer ocoosys:

• options: Ship-to-home
• availability: In Stock
• started: March 29, 2026
• quantity: 5
• sold: 0

general ocoosys:

• Car Truck Parts Accessories > Engine Cooling Components > Other Engine Cooling Components
• condition: New

payments ocoosys:

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

returns ocoosys:

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

shipping ocoosys:

• cost: $0.00
• transit: 4-7 Days
• service: Standard, Expedited
• class: Standard, Expedited
• type: Fixed

seller ocoosys:

• # reviews: 638706
• rating: 99.6%
• city: Indianapolis, Indiana

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