Skip to product information
1 of 4

FleetPro Parts

PAI Thermostat Kit - 681850 / 603090

PAI Thermostat Kit - 681850 / 603090

Regular price $12.79 USD
Regular price $25.58 USD Sale price $12.79 USD
Sale Sold out
Shipping calculated at checkout.
In Stock

Shipping Policy

Orders are typically processed within 24–48 hours, Monday through Friday, excluding major U.S. holidays. Shipping options include Small Package Saver, Ground, Second Day Air, and Next Day Air. Free Shipping applies to qualifying items within the contiguous 48 states. Freight or oversized shipments require a commercial address. Please inspect all deliveries and report damages within 24–48 hours. We ship only within the continental U.S. and cannot deliver to P.O. boxes or international locations. Most orders ship from our North Carolina warehouse.For estimated transit times, see the shipping chart. Read more information.

About us

Expert-selected truck parts

At FleetPro Parts, we specialize in supplying OEM replacement parts for heavy-duty trucks. From Freightliner and Detroit Diesel to Cummins, Mack, Volvo, and Wabco, our catalog covers the components you need to keep your fleet moving. Every part we stock is tested, reliable, and built to match OEM standards, so you can order with confidence. Our team knows truck parts inside out—from engine cooling and steering to AC systems, alternators, and fuel components. Whether you’re maintaining a single truck or managing an entire fleet, we make it easy to find the right part, at the right time. For when it matters. More about Us.

Contact us

FleetPro Truck Center Inc • 4989 Hendersonville Rd, Fletcher, NC 28732 • Phone +1 888-722-1331

View full details

Description:

The PAI 681850 Thermostat Kit is a premium aftermarket replacement engineered for Detroit Diesel Series 50 and Series 60 engines. Equivalent to OEM 23532436, this complete thermostat kit includes a 190°F (88°C) engine coolant thermostat and gasket to help maintain proper engine operating temperature, improve cooling system efficiency, and protect against overheating.

Features:

Brand: PAI Industries
Manufacturer Part Number: 681850
Alternate Part Number: 603090
OEM Part Number: 23532436
Product Name: Engine Coolant Thermostat Kit
Product Category: Cooling System
Opening Temperature: 190°F (88°C)
Gasket Included: Yes
Thermostat Included: Yes
Vented: No
Engine Series: Detroit Diesel Series 50
Engine Series: Detroit Diesel Series 60
Installation Type: Direct Fit
Application: Heavy-Duty Truck Diesel Engines
Material: OEM-Quality Metal Construction
Package Quantity: 1 Kit
Condition: New Aftermarket

OEM Cross Reference: 681850, 603090, 23532436, DDC23532436, DDP681850, PA1681850, 4087-90681850

Part #:
  • 681850 / 603090