WELLS 45YPVPM26 Engine Coolant Temperature Switch

( Brand: Wells ), ( Manufacturer Part Number: 45YPVPM26 ), ( Type: Engine Coolant Temperature Switch ), ( Fits 1: 1978-1980 Ford Fiesta ), ( Fit Note: Engine Coolant Temperature Switch With 2 Blade Terminals; W. ), ( Manufacturer Warranty: 12 Month Warranty ), ( Attention: Please Read All Notes To Confirm Fitment ), ( Cs-sku: 400 )

Review WELLS Engine Coolant Temperature Switch Ford fits FIESTA 1978–1980

The **Wells 45YPVPM26 Engine Coolant Temperature Switch** is a precision-engineered component designed exclusively for Ford Fiesta models produced between 1978 and 1980, ensuring seamless compatibility with the vehicle s cooling system architecture. This high-quality temperature switch plays a critical role in monitoring the engine s coolant temperature, providing essential feedback to the vehicle s electrical and fuel management systems. Crafted from durable materials, including a robust metal housing and a reliable bimetallic sensing element, this switch is built to withstand the demanding conditions of continuous operation under the hood, where temperatures can fluctuate dramatically. The internal design incorporates a sealed, mercury-free mechanism, which guarantees long-lasting performance and eliminates the risk of leaks or corrosion that can plague inferior alternatives. When installed, the switch detects the coolant s temperature and sends a voltage signal to the engine control unit (ECU) or carburetor, enabling precise adjustments to the air-fuel mixture, ignition timing, and cooling fan activation all of which are vital for optimal engine efficiency, fuel economy, and protection against overheating. Whether replacing a faulty original unit or upgrading an existing system, this switch delivers consistent and accurate readings, helping to maintain peak performance and extend the lifespan of the engine. Its straightforward installation process, featuring a standard threaded connection and a straightforward wiring harness, makes it an ideal choice for both professional mechanics and DIY enthusiasts seeking a reliable, no-frills solution. With its focus on durability, precision, and compatibility, the Wells 45YPVPM26 is an indispensable part for any Ford Fiesta owner looking to restore or enhance their vehicle s cooling system functionality.

**Pros and Cons of buying a Wells 45YPVPM26 Engine Coolant Temperature Switch for a Ford Fiesta (1978 1980)**

1. **Compatibility** This part is specifically designed for the Ford Fiesta models from 1978 to 1980, ensuring a proper fit without modification. The part number (45YPVPM26) is widely recognized for these engines, reducing the risk of purchasing an incorrect or generic replacement.

2. **Reliability** Wells is a reputable manufacturer known for producing high-quality automotive parts, including temperature switches. A reliable switch ensures accurate temperature readings, preventing false warnings or engine protection issues.

3. **Easy Installation** The switch is a straightforward plug-and-play component. It connects to the thermostat housing and wiring harness, requiring minimal tools and technical skill. Most DIYers can replace it without professional assistance.

4. **Prevents Engine Damage** A faulty temperature switch can lead to incorrect temperature signals, causing the engine to run too hot or too cold. Replacing it with a new, functional unit helps maintain optimal operating conditions, reducing the risk of overheating or coolant system failures.

5. **Cost-Effective** Compared to labor costs for professional installation, purchasing and installing the switch yourself saves money. The part itself is reasonably priced, making it a budget-friendly solution for a common issue.

6. **Widespread Availability** This part is available through various online retailers (e.g., Amazon, RockAuto, eBay) and auto parts stores, ensuring easy access without long waits or special ordering.

7. **Long-Term Performance** A new switch eliminates intermittent or complete failures, which can be frustrating and costly if they lead to secondary issues (e.g., thermostat failure, coolant leaks, or electrical gremlins).

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1. **Potential Counterfeit or Low-Quality Replacements** While Wells is a trusted brand, some online marketplaces may sell counterfeit or inferior copies. Buying from unverified sellers increases the risk of receiving a defective or non-functional part. Always purchase from authorized dealers or well-reviewed retailers.

2. **Misdiagnosis Risk** If the actual issue is not the temperature switch (e.g., a faulty thermostat, coolant leak, or wiring problem), replacing just the switch may not resolve the underlying problem. A thorough diagnosis (e.g., checking for coolant leaks, testing the thermostat, or inspecting wiring) is essential before purchasing.

3. **Limited Lifespan of Related Components** If the vehicle has been running with a faulty switch for an extended period, other components (such as the thermostat, water pump, or hoses) may have degraded. Replacing the switch alone might not address these hidden issues, potentially leading to future repairs.

4. **Electrical Testing Required** Some users may need to test the switch s resistance with a multimeter to confirm it s functioning correctly before installation. While not difficult, this step requires basic electrical knowledge or guidance.

5. **Possible Overheating Symptoms Persist** If the issue stems from a clogged radiator, failing water pump, or coolant leak rather than the switch, replacing the switch alone won t fix the problem. Always rule out other causes before attributing symptoms solely to the temperature switch.

6. **Compatibility with Aftermarket Mods** If the Fiesta has aftermarket modifications (e.g., turbocharging, forced induction, or custom cooling systems), the stock temperature switch may not be ideal. In such cases, a higher-performance or upgraded switch might be necessary.

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The Wells 45YPVPM26 engine coolant temperature switch is a **highly recommended replacement** for the 1978 1980 Ford Fiesta if the issue is confirmed to be a faulty switch. Its compatibility, reliability, and ease of installation make it a practical choice for DIYers and mechanics alike. However, it s crucial to **verify the problem** (e.g., test the switch s resistance, check for coolant leaks, and inspect the thermostat) before purchasing to avoid unnecessary expenses.

If the switch is indeed the culprit, this part will restore proper engine temperature monitoring, prevent overheating, and extend the life of the cooling system. For added peace of mind, consider purchasing from a trusted seller and testing the switch post-installation.

- You ve confirmed the temperature switch is faulty (e.g., no voltage at the switch when the engine is warm, or the switch is physically damaged).

- You re purchasing from a reputable source to avoid counterfeits.

- You re prepared to inspect other components (thermostat, coolant system) to prevent future issues.

- The symptoms (e.g., overheating) persist after replacing the switch, suggesting a deeper issue (e.g., radiator blockage, water pump failure).

- You re unsure whether the switch is the actual problem without testing.

Details:

Engine Coolant Temperature Switch Wells 45YPVPM26 for Ford Fiesta 1978 1979 1980: Brand: condition: New, Notes with 2 Blade Terminals; Light, Specifications Connector Color:White, Quantity:1, Mounting Bracket Included:No. 12 Month Warranty. Detailed Applications Vehicle, 1978 1980 Ford Fiesta.

part #: 45ypvpm26 price

• $34.13

specifications ocoosys:

• for models: Fiesta
• for makes: Ford
• for years: 1978-1980
• brand: Wells
• mpn: 45ypvpm26
• type: Engine Coolant Temperature Switch
• fits 1: 1978-1980 Ford Fiesta
• fit note: Engine Coolant Temperature Switch With 2 Blade Terminals; W.
• manufacturer warranty: 12 Month Warranty
• attention: Please Read All Notes To Confirm Fitment
• cs-sku: 400

returns ocoosys:

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

payments ocoosys:

• wallet: Google-pay
• credit card: Mastercard
• other

general ocoosys:

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

seller ocoosys:

• rating: 97.1%
• # reviews: 57834
• city: Hempstead, New York

shipping ocoosys:

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

offer ocoosys:

• sold: 0
• availability: In Stock
• quantity: 1
• started: May 7, 2026
• options: Ship-to-home

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