Coolant Reserve Tank Set - Honda Acty Truck HA3, HA4 Models - 1990-1999

This coolant reserve tank fits the Honda Acty Truck HA3, HA4 (1990-1999). It holds the overflow coolant and lets the system draw it back as it cools.

Vehicle Fitment & Compatibility

Confirm your chassis code against the table below before ordering.

Reasons to choose this coolant reserve tank

• A cracked, brittle, or leaking original tank
• Coolant loss with no obvious engine leak
• A missing or discolored reservoir

Features & Function

• Holds and returns overflow coolant
• Correct fit for the Acty cooling system
• Restores a sealed expansion circuit

Installation Specifications

• Difficulty: Easy.
• Estimated time: about 30 to 45 minutes.
• Required tools: A screwdriver, hose pliers, and a catch rag.

Frequently Asked Questions

How do I know the reserve tank is the leak?

If you lose coolant with no obvious engine leak, check the reservoir for cracks and a hard, brittle feel, and watch whether the level drops there. A cracked tank leaks slowly and looks like a mystery.

Do I need to bleed the cooling system after?

Yes. Refill and bleed the air out so the system cools properly and the engine does not overheat.

Fitment verified by the Kei truck specialists at Oiwa Garage · Listing updated June 2026.