BOSU Workshop

10/05/2026

07/05/2026

Toyota C-HR with poor acceleration and a failed water pump is likely experiencing engine overheating, causing the computer to enter "limp mode" to protect the engine. Failed water pumps on these models can cause serious engine damage if not addressed immediately. Key signs include a sweet smell (coolant leak), steam, or a whining noise.

Key Causes and Symptoms

Water Pump Failure: The electric water pump can fail between 50,000 to 130,000 miles. A failed pump causes the engine to overheat, leading to severe power loss (limp mode) or complete engine failure.

Acceleration Issues: Poor acceleration can be caused by the engine operating in limp mode, or a faulty boost pressure solenoid valve (common on 2016-2018 1.2L models).Failed Components: The water pump can suffer from plastic impeller failure or bearing failure.

Diagnostics: A diagnostic code P261B often appears in Toyota hybrids for water pump issues.Recommended ActionsStop Immediately: If the temperature gauge is high or warning lights appear, stop driving to avoid ruining the engine.

Check Coolant: Check for leaks, particularly around the water pump housing.Replacement: The water pump generally requires replacement.

Precautionary Maintenance: Consider replacing the water pump and coolant every few years to prevent failure, particularly at high mileage.

02/05/2026

The 1998 Toyota Prado (90 Series) is renowned for its durability, but suspension components like shock absorbers are subject to wear and occasional catastrophic failure, especially in high-mileage or off-road vehicles. Common failure modes include leaking fluid, worn bushings, and, in extreme cases, the shock breaking away from its lower mounting.

Common Symptoms of FailureIf your shocks are failing, you may notice several key indicators:

Excessive Bouncing: The vehicle continues to rock or bounce after hitting a bump or being manually rocked side-to-side.

Unstable Handling: A "loose" steering feel or increased instability at higher speeds, sometimes contributing to "death wobble".Visible Leaks: Oil residue on the body of the shock absorber indicates a seal has failed.Clunking Noises: Worn bushings or loose mounts can create metallic knocking sounds over bumps.

Uneven Tire Wear: Cupping or scalloped patterns on tires often result from worn shocks failing to keep the tire firmly on the road.Known Issues & Maintenance TipsLower Ball Joint Warning: While you're inspecting the shocks, check the lower ball joints. Failure of this part is a critical safety issue for the 90 Series Prado and can lead to the front wheel collapsing.

Bushings First: Often, lower control arm bushings wear out before the actual shock absorbers. Replacing these can sometimes restore ride quality.

Mounting Failures: There have been reports of front shocks breaking off from the lower mounting, though the suspension usually rests on the cross-member to prevent a total collapse.

26/04/2026

Gli 2018 model AC thermostat
The AC thermostat in a Toyota Corolla GLi serves as a temperature regulation device that monitors the cabin and evaporator coil temperatures to prevent the evaporator from freezing and optimize fuel economy. It typically functions by cycling the compressor on and off to maintain a desired comfort level.

Common AC Thermostat & System Problems in GLi (2009–2018 Models)
Intermittent Cooling/Tripping: The AC trips automatically, often in hot weather, during heavy traffic, or at high speeds.
Variable Compressor Failure: Many GLi models (especially 1.3/1.6 2012-2015) use variable displacement compressors controlled by a solenoid valve rather than a standard clutch, which often fails, causing the AC to stop cooling.
Short Cycling: The compressor clicks on and off rapidly, leading to inconsistent cooling and high load on the engine.
High-Pressure Trip: The system may turn off automatically because the pressure switch detects too much pressure, often caused by high external temperatures or poor heat rejection by the condenser.
Overheating: A faulty thermostat or AC system overload can cause the engine to heat up, affecting overall
AC performance.

Troubleshooting and Solutions
Solenoid/Sensor Repair: Cleaning or replacing the AC compressor solenoid/sensor is often more effective than replacing the entire compressor.
Condenser Service: Cleaning the AC condenser (often behind the front bumper) improves heat dissipation, reducing high-pressure trips.
Refrigerant Check: Ensuring proper R134a refrigerant levels and eliminating air in the system.
Blower Speed: Sometimes, keeping the blower on a lower speed (2 instead of 1) prevents the thermostat from freezing the unit and tripping the compressor.