Description
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.
In Stock - ships from our California (USA) warehouse
Fast, reliable delivery - no overseas backorder wait.
Vehicle Fitment & Compatibility
Confirm your chassis code against the table below before ordering.
100% Fitment Guarantee
Not sure about fit? Add your chassis/VIN number at checkout and we confirm it before we ship. If a part does not fit your Acty, we exchange it or refund you in full.
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.
Oiwa Garage Tech Note
"Route the overflow hose without kinks and set the level between the marks when cold. A cracked reservoir loses coolant slowly and looks like a mystery leak."
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.