Description
This thermal vacuum valve fits the Honda Acty Truck HA3, HA4 (1990-1999). It switches a vacuum circuit by coolant temperature to manage emissions and warm-up.
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.
Signs you need this thermal vacuum valve
- Poor warm-up or emissions behavior
- A rough cold idle
- A cracked or leaking valve
Features & Function
- Switches a vacuum circuit by temperature
- Correct valve for the Acty system
- Helps clean warm-up running
Installation Specifications
- Difficulty: Moderate.
- Estimated time: about 30 to 45 minutes.
- Required tools: A wrench, hose pliers, and coolant catch pan.
Oiwa Garage Tech Note
"It threads into a coolant passage, so have a catch pan ready and top up coolant after. Renew the vacuum hoses at the valve while you are there."
Frequently Asked Questions
What does the 53C rating mean?
It switches at that coolant temperature. Match the rating in the title to your original valve before ordering.
How do I test the thermal vacuum valve?
Cold, it should block its vacuum port; warm, it should pass. If warm-up running is poor and the valve does not switch by temperature, it has failed. Check the vacuum hoses too.
Fitment verified by the Kei truck specialists at Oiwa Garage · Listing updated June 2026.