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2002 Chevy venture the temperature gauge goes up you can smell coolant when it does and down turn heater on what is causing this?

1. Coolant leak:

• There may be a leak in the cooling system, such as a cracked radiator or hose, allowing coolant to escape.

2. Faulty Thermostat:

• A malfunctioning thermostat can cause the engine to overheat.

3. Radiator Issues:

• If the radiator is clogged or blocked, coolant cannot flow properly, leading to overheating. A faulty radiator cap can also cause coolant loss and overheating.

4. Water Pump Failure:

• A failing water pump cannot circulate coolant effectively, causing the engine to overheat.

5. Faulty Temperature Sensor:

• A faulty temperature sensor can provide incorrect readings, leading to the temperature gauge showing inaccurate information.

6. Air Pockets:

• Air pockets can form in the cooling system, preventing proper coolant circulation and causing overheating.

7. Head Gasket Issues:

• A blown head gasket can allow coolant to leak into the combustion chamber, leading to overheating and coolant smell.

*Note: It's essential to have a qualified mechanic diagnose and repair the exact issue to prevent further damage to your vehicle.*