Detroit Diesel 23514708 Coolant Temperature Sensor – Series 60 Series 50

The Detroit Diesel 23514708 is a genuine OEM coolant temperature sensor (CTS) designed for Detroit Series 60 and Series 50 diesel engines. This critical sensor is mounted on the right rear corner of the cylinder head, behind the turbocharger, where it monitors engine coolant temperature and sends an electrical signal to the DDEC (Detroit Diesel Electronic Control) module. The ECM uses this data to optimize fuel injection timing, manage engine protection systems, control the cooling fan, and ensure proper cold start enrichment for reliable performance across all operating conditions.

Signs You Need a New Coolant Temperature Sensor

• Check engine light with coolant temperature fault codes
• Erratic or inaccurate temperature gauge readings
• Engine overheating without actual high coolant temperature
• Cooling fan running constantly or not engaging when needed
• Poor fuel economy due to incorrect fuel mixture
• Hard starting, especially in cold weather
• Engine running rich (black smoke) or lean
• Engine protection mode activating unnecessarily

Specifications

Cross References

This coolant temperature sensor replaces or is equivalent to the following part numbers:

• Detroit Diesel: 23514708, DDC23514708, 23515251
• PAI Industries: 650655
• Interstate-McBee: A-23514708
• Gems/GE: GT7610-477, GEGT7610-477, 10GE477GT350F
• Fortpro: F238810

Engine Applications

This coolant temperature sensor fits the following Detroit Diesel engines:

• Detroit Diesel Series 60 11.1L – DDEC II, III, IV
• Detroit Diesel Series 60 12.7L – DDEC II, III, IV, V
• Detroit Diesel Series 60 14.0L – DDEC IV, V
• Detroit Diesel Series 50 8.5L – DDEC III, IV
• Detroit Diesel 149 Series – Select applications

Vehicle Applications

These engines are commonly found in:

• Freightliner – FLD, Classic, Century, Columbia, Argosy
• Peterbilt – 357, 377, 378, 379, 385, 386, 387
• Kenworth – T600, T800, W900, C500
• International – 9200, 9400, 9900
• Volvo – VN Series, VNL
• Western Star – 4900 Series
• Sterling – Select models with Series 60

How the Coolant Temperature Sensor Works

The coolant temperature sensor is a thermistor (temperature-sensitive resistor) that changes electrical resistance based on coolant temperature. As coolant temperature increases, the sensor's resistance decreases, which changes the voltage signal sent to the DDEC ECM. The ECM uses this information to:

• Adjust Fuel Injection: Provides fuel enrichment during cold starts and optimizes timing as the engine warms up
• Control Cooling Fan: Engages and disengages the engine cooling fan based on temperature thresholds
• Manage Engine Protection: Triggers warnings, derates, or shutdown if coolant temperature exceeds safe limits
• Optimize Performance: Fine-tunes injection timing and duration for current operating temperature

Sensor Location

The coolant temperature sensor on Detroit Series 60 engines is located on the right rear corner of the cylinder head, behind the turbocharger. Access may require removal of some intake or exhaust components depending on the specific vehicle installation.

Installation Notes

• Drain coolant below sensor level before removal
• Disconnect electrical connector before removing sensor
• Clean threads in cylinder head before installing new sensor
• Apply thread sealant approved for coolant system use
• Torque new sensor to specification – do not overtighten
• Refill coolant and bleed air from system
• Clear any fault codes with DDEC diagnostic reader
• Verify proper temperature readings after warm-up cycle

Pigtail Connector

If your wiring harness connector is damaged or corroded, the compatible pigtail connector is part number W094104. This allows repair of the harness without full replacement.

Verify your engine serial number and DDEC version before ordering to confirm fitment. Series 60 engines with different DDEC versions may use different sensor configurations.

Handling Time
At All Pro Truck Parts we do our best to ship all orders same day for orders placed before 12:00pm Central Standard Time. Same day shipment is never guaranteed. For standard UPS or USPS shipping, you will typically receive your package in 1 - 5 business days. Shipping times are never guaranteed and All Pro Truck Parts is not responsible for lost or delayed shipments by the carrier. Carrier times vary by distance from shipment origin and may change without prior notice. Shipping price is calculated from package dimensions and weight. Calculated rates for orders will be available at checkout. Orders placed after 12:00pm CST on Fridays will not be fulfilled until the following business day, Monday morning barring a holiday.

Next Day Air Shipments
The cutoff time for UPS Next Day Air is 12:00PM. If you have missed the cutoff time but would still like to place an order for Next Day delivery, please send us a text message or email. We can try to accommodate and ship your order from another warehouse.

Incorrect Shipping prices
All Pro Truck Parts reserve the right to cancel any order, in the event shipping rates are calculated incorrectly at checkout. We will notify you at your provided contact information to give you the option to pay the correct amount, or allow you to cancel the order for a full refund. 

Free Shipping
Select products qualify for free shipping. Qualifying product groups can change without notice. Free shipping will be shipped via UPS Ground, USPS First Class or USPS Priority Mail.  

Domestic Shipping Services

• USPS Domestic Shipping Services
• USPS Priority Mail
• USPS First Class Package
• USPS Ground Advantage
• USPS Priority Mail Express
• UPS Shipping Services
• UPS Ground
• UPS 2nd Day Air A.M. (commercial addresses only)
• UPS 2nd Day Air
• UPS 3 Day Select
• UPS Next Day Air Saver
• UPS Next Day Air
• UPS Next Day Air Early
• UPS Standard

International Shipping Services

• USPS International Shipping
• USPS First Class Package International
• USPS Priority Mail Express International
• USPS Priority Mail International
• UPS International Shipping
• UPS Worldwide Expedited
• UPS Worldwide Express Plus
• UPS Worldwide Express
• UPS Worldwide Saver

Returns
All Pro Truck Parts offers lifetime returns for any reason on NEW, UNOPENED items in the original packaging with exceptions. (See sale items and special order items).
To be eligible for a return, your item must be unused and in the same condition that you received it. It must also be in the original packaging.

Used items (if applicable)
Items marked as USED at the time of sale will be accepted for return up to 30 days from the date of sale. 

Defective items (if applicable)
Defective items under manufacturer warranty will be eligible for return, as well as a full refund for the total amount paid by the customer. The following criteria must be met to be eligible. (a). The part is under manufacturer warranty (b). the manufacturer has determined the part defective for the purchased application. 

Refunds (if applicable)
Once your item is returned and received and inspected, we will send you an email to notify you that we have received your returned item. We will also notify you of the approval or rejection of your refund.
If approved, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within 7 business days. For order placed by phone through a card terminal, you must call in to initiate the refund. 

Late or missing refunds (if applicable)
If you haven’t received a refund yet, first check your bank account again.
Then contact your credit card company, it may take some time before your refund is officially posted.
Next contact your bank. There is often some processing time before a refund is posted.
If you’ve done all of this and you still have not received your refund yet, please contact us at sales@allprotruckparts.com.

Sale items (if applicable)
Only regular priced items may be refunded, unfortunately sale items cannot be refunded. 

Special Order Items (if applicable)
Special order items may be eligible for a refund. The decision to accept a special order item for refund is left solely to the All Pro Truck Parts management team. 

Exchanges (if applicable)
We only replace items if they are defective or damaged. If you need to exchange it for the same item, send us an email at sales@allprotruckparts.com and send your item to: All Pro Truck Parts, 3948 Interstate 30 W, Caddo Mills TX 75135, United States.

Shipping
To return your product, you should mail your product to: All Pro Truck Parts, 3948 Interstate 30 W, Caddo Mills TX 75135, United States

You will be responsible for paying for your own shipping costs for returning your item. Shipping costs are non-refundable.

Depending on where you live, the time it may take for your exchanged product to reach you, may vary.

If you are shipping an item over $75, it is advised that you use a trackable shipping service or purchasing shipping insurance. We don’t guarantee that we will receive your returned item.
For returned items designated as "Free Shipping", any items shipped to the customer in which the customer did not pay shipping. All Pro Truck Parts will recover the cost of shipping to the customer's address from the refundable amount owed to the customer on the return and inspection of the item.