Frequently Asked Questions About International S1700-S1900 Coolant Reservoirs

Will these coolant reservoirs fit my specific International S-Series truck model and year?

Our coolant reservoirs are designed to fit International S1700, S1800, and S1900 models from 1979 through 2001. However, there were minor mounting bracket variations between early models (1979-1989) and later models (1990-2001). Before ordering, check your existing reservoir's mounting tab configuration - early models have two mounting tabs while later models have three. If you're unsure, contact us with your VIN and we'll verify the correct part for your truck.

What's the difference between OEM and aftermarket coolant reservoirs in terms of quality and durability?

OEM reservoirs are made from high-density polyethylene (HDPE) with UV inhibitors and typically last 15-20 years. Aftermarket options vary in quality - our premium aftermarket reservoirs use similar HDPE construction and carry a 3-year warranty. Budget aftermarket options may use standard polyethylene without UV protection, which can become brittle after 5-7 years of sun exposure. Look for reservoirs with reinforced necks and thick wall construction (minimum 3mm) for best longevity.

What tools and time are required for installation?

Installation typically takes 30-45 minutes and requires basic hand tools: 10mm and 13mm sockets, pliers for hose clamps, and a drain pan. You'll need to drain approximately 2 gallons of coolant, so have replacement coolant ready. The main challenges are accessing the lower mounting bolt (a wobble extension helps) and ensuring proper hose routing to avoid kinks. No special tools or programming are required.

How do I know if my coolant reservoir needs replacement versus just cleaning?

Replace your reservoir if you see any cracks (check around the neck and mounting tabs), discoloration that won't clean off, or if the plastic feels brittle when pressed. White chalky residue on the outside indicates UV damage. Interior staining is normal and doesn't require replacement unless accompanied by cracks. If your cap doesn't seal properly after replacing the cap itself, the reservoir neck threads are likely worn and replacement is needed.

Are there different capacity options, and which one do I need?

Standard S-Series coolant reservoirs hold 1.5 gallons, which is sufficient for stock cooling systems. If you've added an aftermarket charge air cooler or run heavy loads in hot climates, consider the 2-gallon heavy-duty option. Trucks with CAT 3126 or DT466 engines should stick with the standard 1.5-gallon size due to engine bay clearance. The reservoir should be filled to about 1/3 capacity when the engine is cold for proper expansion room.