Description
This Radiator Cap fits the Daihatsu Hijet Truck S100P, S110P (1994-1998). It seals the cooling system and holds it at the factory pressure so the coolant cannot boil over.
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 Hijet, we exchange it or refund you in full.
Signs you need this radiator cap
- Overheating or coolant pushed to the overflow
- Coolant loss with no visible leak
- A cap that fails a pressure test
- A cracked or flattened seal
Features & Function
- Holds the factory pressure to raise the boiling point
- Sprung valve vents and draws back on cool-down
- Protects the radiator, hoses, and pump seal
Installation Specifications
- Difficulty: Easy.
- Estimated time: about 5 minutes.
- Required tools: No tools needed - it twists off by hand.
Oiwa Garage Tech Note
"If you fit a new cap and still lose coolant, pressure-test the system before blaming the head gasket - a tired cap and a weeping hose look identical from the seat."
Frequently Asked Questions
Does the pressure rating matter?
Yes - match the factory rating. A weak cap drops the boiling point, which causes overheating and coolant loss.
How do I confirm this fits my truck?
Match your chassis code (stamped on the VIN / data plate) to the fitment table above - S100P, S110P, 1994-1998.
Fitment verified by the Kei truck specialists at Oiwa Garage · Listing updated June 2026.