The Daihatsu Hijet is known for its compact size, versatility, and reliable performance, especially in urban environments and as a workhorse vehicle for small businesses. However, like any vehicle, the Hijet is not immune to certain mechanical and operational issues over time. Understanding these common issues and knowing how to fix them can save owners a lot of time and money while extending the life of their beloved mini truck. Here’s a comprehensive look at the most frequently reported issues with the Daihatsu Hijet, along with practical solutions for each one.

1. Engine Overheating

Problem: Overheating is one of the more common issues reported by Daihatsu Hijet owners, especially in warmer climates or during heavy loads. Overheating can be caused by various factors, including a failing water pump, a blocked radiator, or low coolant levels.

Solution: Regularly check the coolant levels, particularly before long trips or heavy load days. Also, inspect the radiator for any blockages or leaks. If the water pump is suspected to be faulty, consider replacing it promptly to prevent engine damage. Flushing the radiator and ensuring proper circulation can also help mitigate overheating issues.

2. Transmission Slipping or Hard Shifting

Problem: Transmission issues, such as slipping gears or hard shifting, are a common issue in older Hijet models or those with high mileage. This can be due to low transmission fluid levels, dirty or worn-out transmission fluid, or worn-out gears.

Solution: Begin by checking the transmission fluid level and top it up if necessary. If the fluid appears dark or burnt, it’s time for a full transmission flush and replacement. For more severe cases involving worn gears, a professional mechanic should be consulted to avoid causing further damage.

3. Starting Problems (Starter Motor or Battery Issues)

Problem: Some Daihatsu Hijet owners report issues with starting, especially in colder weather. This could be caused by a weak or failing battery, worn-out starter motor, or faulty ignition system components.

Solution: If the battery is old, consider replacing it. Ensure that the battery connections are clean and secure. For the starter motor, a thorough inspection will reveal if it’s functioning properly. Cleaning corroded terminals and ensuring the solenoid and wiring are intact can improve starting performance.

4. Weak or Malfunctioning Brakes

Problem: Many Hijet owners report that their brakes feel soft or require more force than expected. This issue can be due to worn brake pads, air in the brake lines, or a faulty brake booster.

Solution: Check the brake pads and replace them if they’re worn. Bleeding the brakes can help remove any trapped air in the lines, which can restore firmness to the brake pedal. In cases where the brake booster is faulty, replacement may be necessary. Regular brake fluid checks and pad inspections can help prevent brake-related issues.

5. Suspension Wear and Tear

Problem: Suspension issues are common, particularly with the Hijet’s small and lightweight frame, which can be susceptible to wear and tear from frequent use on rough roads. Signs include a bouncy ride, poor handling, or clunking noises from the suspension.

Solution: Regularly inspect the suspension components, including shocks, struts, and bushings. Replace worn-out parts to maintain ride quality and handling. Consider investing in upgraded shocks or springs if the vehicle is frequently used on rough terrain, as this can increase the longevity of the suspension.

6. Rust and Corrosion

Problem: Due to its smaller size, the Hijet is often used in environments where it’s exposed to the elements, leading to rust and corrosion, especially on the undercarriage and body panels. Rust can lead to serious structural issues if not addressed.

Solution: Regularly inspect the undercarriage and other exposed metal areas for signs of rust. Applying an anti-rust coating can help protect these areas. For existing rust, sand down the affected spots and apply a rust converter followed by a protective coating to prevent further spread.

7. Electrical System Malfunctions

Problem: Electrical issues, such as malfunctioning lights, failing power windows, or issues with the dashboard indicators, are reported by many Hijet owners. These problems often stem from wiring issues or a weak alternator.

Solution: Check all electrical connections, especially in the battery and alternator, for signs of wear, corrosion, or looseness. Replace any frayed wires and ensure the battery terminals are clean. If electrical issues persist, it may be worth consulting a specialist to examine the wiring harness and alternator for potential faults.

8. Excessive Oil Consumption

Problem: Older Hijet models, particularly those with high mileage, may suffer from excessive oil consumption. This could be due to worn piston rings, a faulty PCV valve, or leaks in the oil system.

Solution: First, check for any visible oil leaks around the engine block and oil pan, and fix any that are found. Inspect the PCV (Positive Crankcase Ventilation) valve, which is relatively inexpensive to replace if faulty. For issues with worn piston rings, an engine rebuild may be necessary, although this is a more costly and time-consuming fix.

9. Fuel Efficiency Problems

Problem: Fuel efficiency is a major selling point of the Hijet, but owners sometimes report a noticeable decrease in fuel economy. This can be caused by dirty fuel injectors, a clogged air filter, or issues with the exhaust system.

Solution: Start by inspecting the air filter and replacing it if it’s dirty or clogged. Regularly clean the fuel injectors to ensure proper fuel atomization and optimal engine performance. Additionally, check the exhaust system for any blockages or leaks, which can affect fuel economy and overall engine efficiency.

10. Issues with the Cooling System

Problem: Besides overheating, some Hijet owners experience other cooling system problems, such as leaks in the radiator, malfunctioning fans, or coolant leaks from hoses.

Solution: Regularly inspect the radiator and hoses for signs of leaks or wear. Replace any brittle or cracked hoses, and ensure that the radiator fan is functioning correctly. If there are signs of coolant leakage, it may be worth investing in a new radiator or resealing existing components to prevent further leaks.

Maintenance Tips to Prevent Common Daihatsu Hijet Issues

While the Daihatsu Hijet is a reliable mini truck, regular maintenance can go a long way in preventing the issues listed above. Here are some practical maintenance tips:

1. Routine Oil Changes: Changing the oil regularly can help prevent excessive wear on engine components and keep your engine running smoothly.

2. Keep the Cooling System in Check: Regularly flush the radiator and refill with coolant to keep the cooling system in good condition. Inspect the water pump and radiator fan periodically.

3. Inspect Belts and Hoses: Worn-out belts and hoses can lead to serious issues if they fail unexpectedly. Regularly inspecting these components and replacing them as needed can prevent breakdowns.

4. Use High-Quality Parts: When replacing any parts, especially in the suspension, brakes, or engine, use high-quality OEM or equivalent parts to ensure longevity and reliability.

5. Protect Against Rust: Apply anti-rust coating to the undercarriage and other vulnerable areas, especially if you frequently drive in wet or salty conditions.

6. Regular Battery Maintenance: Clean the battery terminals regularly, and ensure the battery is properly charged, especially before winter months when starting requires more power.

7. Stay on Top of Fluid Levels: Check and top off all fluids, including brake fluid, transmission fluid, and coolant, to ensure your Hijet runs efficiently.

Conclusion

Owning a Daihatsu Hijet comes with its unique set of challenges, but being aware of these common issues and how to address them can make a significant difference in the longevity and reliability of your vehicle. By following the maintenance tips and solutions outlined here, Hijet owners can continue to enjoy their vehicles for many years, keeping them roadworthy and dependable in various conditions. With regular care and attention, the Daihatsu Hijet remains a practical, versatile choice for urban driving and light-duty work.