High-Quality Radiator Cap for Honda Acty Truck HA3, HA4 - 1990-1999 - Front View
Durable Radiator Cap for Honda Acty Truck HA3, HA4 - Side View - 1990-1999
Honda Acty Radiator Cap - 1990-1999 - Bottom View
Close-up of Radiator Cap for Honda Acty Truck - 1990-1999
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High-Quality Radiator Cap for Honda Acty Truck HA3, HA4 - 1990-1999 - Front ViewDurable Radiator Cap for Honda Acty Truck HA3, HA4 - Side View - 1990-1999Honda Acty Radiator Cap - 1990-1999 - Bottom ViewClose-up of Radiator Cap for Honda Acty Truck - 1990-1999

Radiator Cap - Honda Acty Truck HA3, HA4 Models - 1990-1999

Oiwa Garage
1 review
Price:
$29.16
Stock:
In stock

Need help? Call or Text: 562-661-8862

Description

This radiator cap fits the Honda Acty Truck HA3, HA4 (1990-1999). It holds cooling system pressure so the coolant boiling point stays high.

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.

Honda Acty Truck HA3, HA4 (1990-1999) - fitment
Make Honda
Model Acty Truck
Chassis Codes HA3, HA4
Years 1990-1999
Part Type radiator cap - direct-fit replacement

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.

Signs you need this radiator cap

  • Overheating or coolant loss
  • A cap that will not hold pressure
  • A corroded or weak cap seal
  • Coolant in the reserve but a low radiator

Features & Function

  • Holds correct cooling system pressure
  • Correct rating for the Acty radiator
  • Raises the coolant boiling point

Installation Specifications

  • Difficulty: Easy.
  • Estimated time: a couple of minutes.
  • Required tools: No tools.

Oiwa Garage Tech Note

"Only open or replace the cap on a cold engine. A weak cap is a cheap and common cause of mystery overheating on these trucks - rule it out first."

Frequently Asked Questions

How do I test the radiator cap?

A weak cap causes overheating and coolant pushed into the reserve. On a cold engine, check the seal for cracks or corrosion; a proper pressure test on the cap confirms whether it holds.

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.

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