* Inefficient engine operation: The thermostat regulates coolant flow to maintain optimal engine operating temperature. Without it, the engine will take much longer to reach operating temperature, leading to incomplete combustion, poor fuel economy, and increased emissions.
* Increased engine wear: Running constantly at a lower temperature increases wear and tear on engine components. Lubrication isn't as effective at lower temperatures.
* Potential for overheating: While it might seem counterintuitive, running without a thermostat *can* lead to overheating. The engine may not get enough coolant circulation to dissipate heat properly under heavy loads or in hot weather.
* Damage to engine components: The fluctuating temperature without a thermostat can cause damage to the engine block, head gasket, and other sensitive parts.
In short, while the car might run, operating a 2000 Chevy Cavalier without a thermostat is extremely detrimental to the engine's longevity and performance. Replacing the thermostat is a relatively inexpensive and straightforward repair. It's far cheaper than dealing with potential engine damage down the line.
