Cooling system

Overheating

• Insufficient coolant in system.
• Thermostat faulty.
• Radiator core blocked, or grille restricted .
• Electric cooling fan or thermoswitch faulty.
• Ignition timing incorrect .
• Inaccurate temperature gauge sender unit .
• Airlock in cooling system.

Overcooling

• Thermostat faulty.
• Inaccurate temperature gauge sender unit .

External coolant leakage

• Deteriorated or damaged hoses or hose clips.
• Radiator core or heater matrix leaking .
• Pressure cap faulty.
• Water pump seal leaking .
• Boiling due to overheating .
• Core plug leaking .

Internal coolant leakage

• Leaking cylinder head gasket .
• Cracked cylinder head or cylinder bore .

Corrosion

• Infrequent draining and flushing .
• Incorrect coolant mixture or inappropriate coolant type.

Fuel and exhaust systems

Excessive fuel consumption

• Air filter element dirty or clogged.
• Choke mechanism faulty - carburettor models .
• Fuel injection system fault - fuel-injected models.
• Ignition timing incorrect/ignition system fault .
• Tyres under-inflated .

Fuel leakage and/or fuel odour

• Damaged or corroded fuel tank, pipes or connections.
• Carburettor float chamber flooding (float height incorrect).

Excessive noise or fumes from exhaust system

• Leaking exhaust system or manifold joints .
• Leaking, corroded or damaged silencers or pipe.
• Broken mountings causing body or suspension contact.