CARMOCAR Engine Coolant Reservoir replacement tank for International/IC 2002-2018 – direct-fit, OE mounting

CARMOCAR Engine Coolant Reservoir 603-5104 is a direct-fit replacement expansion tank designed for select International Harvester and IC Corporation models, restoring coolant recovery and overflow control in the engine bay.

This replacement coolant reservoir fits multiple heavy-duty truck platforms from 2002 to 2018, including International 3200/4100/4200/4300 series and various IC Corporation and International 1300/1300 FBC models. Built to match OE mounting points and hose connections, the tank helps return excess coolant to the cooling system and keeps the radiator connected to the engine through its recovery hose. Before ordering, verify the listed part numbers against your vehicle’s OEM reference to ensure compatibility.

Which vehicles and part numbers does this reservoir replace?

This reservoir is offered as a replacement for numerous OEM part numbers and fits several International and IC Corporation chassis years. It covers models commonly used in school buses, commercial shuttles, and light-duty transit applications.

• Compatible part numbers: 603-5104, 2599039C91, 2602872C91, 2602943C91, 2591625C92, 3829605F91, 3829605F92, LSETIN007.
• Vehicle fit examples: International 3200, 4100, 4200, 4300 (2002–2016); IC Corporation 1300 FBC (2006–2015); International 1300 variants (2010–2012).
• Always cross-check OEM references and mounting locations before purchase.

How does this coolant reservoir function in the cooling system?

The reservoir stores overflow coolant when the cooling system pressure rises and returns it when the engine cools, maintaining proper coolant levels and reducing air entry. It connects to the radiator via a hose and is typically located beside the engine compartment for direct flow management.

• Acts as an expansion tank to capture excess coolant during heat cycles.
• Feeds coolant back to the radiator when system pressure normalizes.
• Helps prevent coolant loss, which can lead to overheating or corrosion if unattended.

What should I check before installing this replacement reservoir?

Confirm fitment by comparing OEM part numbers, mounting bracket locations, and hose connection sizes. Inspect the vehicle’s coolant lines and cap condition; replacing a brittle hose or worn cap at the same time reduces leak risk and ensures a secure seal.

• Verify OEM numbers listed above match your vehicle reference.
• Check bracket and bolt hole alignment to the existing mounting points.
• Examine hose diameter and clip compatibility for a leak-free connection.

What support and warranty does CARMOCAR provide?

CARMOCAR offers a one-year customer service period for this replacement reservoir and customer support for fitment or product issues. Contact CARMOCAR if you encounter installation problems; they commit to respond within 24 hours to support inquiries.

• One-year customer service coverage from the date of purchase.
• Contact support for fitment verification or replacement guidance.
• Inspect photos and OEM references included in the listing before ordering.

Who is this for: This CARMOCAR Engine Coolant Reservoir is intended for mechanics, fleet managers, and owners of International Harvester and IC Corporation vehicles who need a direct-fit replacement part. It’s suitable for preventative maintenance or repair when the original tank shows cracks, leaks, or aged plastic, and for anyone requiring a straightforward swap using existing mounting points and hoses. Verify your OEM part number and vehicle model year to ensure compatibility before purchase.