Mack CV/GU Truck Coolant Reservoirs

Frequently Asked Questions About Mack CV/GU Truck Coolant Reservoirs

Will this coolant reservoir fit my specific Mack CV or GU model?

Mack CV and GU trucks were produced over several model years and can have variations in engine and cooling system setup, so mounting points and hose fitting sizes may differ. Always check the reservoir's listed part number and compatibility notes against your truck's VIN or existing tank before ordering, and compare it to your original unit if you are unsure.

What material are these coolant reservoirs made from, and how durable is it?

Most coolant reservoirs for the Mack CV/GU are made from high-density polyethylene or a similar durable plastic designed to withstand engine bay heat, vibration, and constant exposure to coolant. This material resists cracking better than older or brittle OEM tanks that have degraded over time from UV and heat exposure.

How do I know if my coolant reservoir needs to be replaced?

Common signs include visible cracks, leaks around the seams or fittings, discoloration or cloudiness that makes fluid level hard to read, a cap that no longer seals properly, or coolant loss that cannot be traced to another part of the cooling system. If your tank shows any of these signs, replacement is usually more reliable than a temporary repair.

Is installation something I can do myself, or does it require a mechanic?

Replacing a coolant reservoir is a straightforward job for most owner-operators or shop technicians. It generally involves draining or containing existing coolant, disconnecting hoses and the low-level sensor if equipped, unbolting the old tank, and mounting the new one before reconnecting everything. No special tools are typically required, but always let the engine cool completely before starting.

Do these reservoirs come with the cap, sensor, or mounting hardware included?

This varies by listing, so check the product description carefully. Some reservoirs are sold as the tank only, while others may include the cap or hardware. If your truck uses a low coolant level sensor, confirm whether the replacement tank is pre-drilled or threaded for it before you order.