It does this by allowing water to enter the engine when it is getting hot, and by keeping coolant from entering while the vehicle warms up.
The heater core itself can go bad.
The dealer replaced the thermostat under warranty at 30K miles, but so far no AC problems. At the simplest level, there are two main reasons why the heater is not working.
Chevrolet Sonic 2013 Automatic 140000 miles, I have a 2013 chevy sonic after replacing the thermostat, radiator, fan and spark plugs the car is still overheating frequently, I have 2013 sonic I've had my ad in shops looks like. Service says it won't relearn and has to be replaced.
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The same occurred to me and I discovered that the engine mounting on the right side, the one that is next to the air filter was making the noise.
Curious how the 2016 Sonic compares to other years?
There is also a similar noise coming from the right superior part of the car, which is really annoying. They both should feel warm or hot to the touch with the engine on. I own a Sonic 2014 and the transmission resulted being one of the worst ones. The worst complaints are coolant leak.
Seems like a cash grab!!! While there are a variety of reasons your Chevrolet Sonic is overheating, the most common 3 are a coolant leak (water pump, radiator, hose etc.
Adding coolant to a radiator dry enough not to trigger the engine temp sensor can cause problems from drastic temperature change. It is the last line of defense between you and an overheating engine.