Honda Vamos HM1, HM2: Cylinder Head Gasket Overheating Issue

Initial Symptoms of Cylinder Head Gasket Issues

One common issue with the Honda Vamos HM1 and HM2 is the loosening of the cylinder head gasket, leading to overheating. Initial signs include:

• Low LLC (Long Life Coolant) level in the radiator.
• LLC contamination with engine oil.
• Appearance of air bubbles in the coolant.

Additionally, check the engine oil level gauge for an increase, as this could indicate LLC is flowing into the engine oil system.

Potential Consequences

Continuing to drive the vehicle under these conditions may lead to overheating, which could result in severe engine damage.

Repair Procedure

1. Inspect the cylinder head for distortion.
2. If no distortion is found, replace the head gasket.

Additional Diagnostic Tips

The following issues are also common in the Honda Vamos HM1 and HM2 models:

1. Radiator fan motor failure: Check if both radiator fans are rotating at sufficient speed after warming up the engine or turning on the A/C switch.
2. Thermostatic valve malfunction: Verify if the valve opens completely under appropriate conditions.