Fill the RADIATOR with coolant. If it is full the sensor needs to be removed and cleaned.
Air bubbles in the system will cause this. I'm told it is very difficult to remove air in the coolant in Sunfires, & sometimes raising the front of the car with a towtruck is the last resort. Ramps under the front tires might work. It took us 2 visits to the mechanic to get all the air out.
I have had this problem with my 1997 Sunfire. Its a 2 door Coupe. The engine overheated, and the coolant light came up. I almost had my head gasket repaired, and come to find out, the coolant cap was wore out, causing the coolant to leak, causing the light to come on, and the engine to overheat.
I had the same problem with my 2.4 1998. After serveral trips to the mechanic, replacing the thermostat twice, replacing the pressure hoses and countless gallons of coolant I found out the water pump was bad. Get this looked at ASAP!!! I waited a few months until I was able to afford the pump replacement (cost me $1100). This also included replacing the timing chain, which any mechanic will suggest and I would agree.
it's getting too cool, really
Fill your coolant reservoir and the light should turn off. Do it soon or your engine may over heat.
most likely the sensor in the bottom of the coolant reservoir is gone change reservoirs then see
The plastic tank is held on with a single bolt.It's below the tank toward the front of the car. Use plyers to slip hose clamps off.
A 1996 Pontiac Sunfire uses Dexcool coolant. This should only be mixed with distilled water, never tap water. Replace the coolant every 2 years or as needed.
Coolant is all pretty much the same from manufacturer to manufacturer. Check your owner's manual to find out the right mixture for your Sunfire
Add the coolant into the coolant reservoir. Be sure the engine is cool when you remove the cap off the reservoir.
whaT KIND OF COOLANT DO I PUT IN MY 2001 PONTIAC SUNFIRE Generally, the GM model vehicles, or is this case, the sunfire, use a specific kind of coolant called DEX-cool extended life engine coolant. It is orange-ish in color and most of the time GM specific. i have a 01 sunfire, 2.2 liter myself, and on my car frame, i have a sticker that says "Use only DEX-cool engine coolant....". Hope this helps!
On my 99 sunfire it is directly to the back/side of the alternator; very easy to spot
Under hood, passenger side, and under coolant reservoir
The low coolant sending unit is integral to the coolant reservoir. I just called two dealers, they were both $117 for the reservoir(!!). Before replacing, try cleaning the contacts on the connector, and also try cleaning the sensor in the reservoir with a long bursh before spending that much money.
it is right beside your coolant reservoir