How do you reset the low coolant lights on dash a 2003 Pontiac Grand Am?

There's no reset button for the low coolant light on a 2003 Pontiac Grand Am (or most cars for that matter). The light is triggered by a sensor that detects low coolant level in the overflow reservoir. The light only goes out when the problem is fixed.

To get rid of the low coolant light, you need to:

1. Identify and address the coolant leak: Find the source of the leak. Look for visible leaks around the radiator, hoses, water pump, thermostat housing, and engine block. A pressure test by a mechanic may be needed to find a leak that isn't easily visible.

2. Refill the coolant: Once the leak is fixed (or if you simply had low coolant), carefully add the correct type and concentration of coolant to the overflow reservoir. Consult your owner's manual for the correct type (usually a 50/50 mix of coolant and distilled water). Never open the radiator cap when the engine is hot.

3. Run the engine: After refilling, run the engine for a while to allow the coolant to circulate and the system to reach operating temperature. Let the engine cool completely before checking the coolant level again.

4. Check for leaks again: After running the engine, inspect the system again for any new leaks.

If the light stays on after properly refilling and fixing any leaks, there could be a problem with the coolant level sensor itself or the wiring to the sensor. In this case, you'll need a mechanic to diagnose and repair the issue. Simply adding coolant and hoping the light goes away isn't a solution—it could mask a serious problem that could lead to engine damage.