Will a bad thermostat cause car to die and not start back up?

While a faulty thermostat can cause various engine issues, it is unlikely to be the sole reason for a car to die and not start back up. A bad thermostat typically affects the engine's temperature regulation, leading to overheating or underheating. Here are some potential causes that could lead to a car not starting:

1. Battery Issues: A weak or dead battery can prevent the car from starting, even if the thermostat is functioning correctly.

2. Starter Problems: A faulty starter motor or solenoid can prevent the engine from cranking, causing a no-start condition.

3. Fuel System Issues: Malfunctions such as a clogged fuel filter, faulty fuel pump, or injector problems can restrict or prevent fuel flow to the engine.

4. Ignition System Failures: Faulty spark plugs, ignition coils, or a defective ignition switch can interrupt the ignition process, preventing the engine from starting.

5. Security System Malfunctions: In some cases, a malfunctioning security system can immobilize the car, making it unable to start.

To accurately diagnose the cause of the no-start issue, it's recommended to seek assistance from a qualified mechanic or conduct further diagnostics. Using diagnostic tools and examining various components can help pinpoint the specific issue and determine whether the thermostat is involved.