Skip the auto shop - Our mechanics make house calls

Q: The cooling mood on my 2007 chevy cobalt came on out of nowhere. I had a guy pour antifreeze in and it was okay until yesterday.

asked by on

Cooling mode came on someone put antifreeze in it for my friend cooling mode went off but the heat still wouldn't work and when it did it would work and then not work. Cooling mode came back on let the car cool down and put more into it cooling mode went off then yesterday it came back on as soon as we hit the highway then the car starts slowing down and then completely stopped so we got over on the side of the road and then had it towed.

My car has 210786 miles.
My car has an automatic transmission.

A: Hi there. Check the coolant level to see i...

Hi there. Check the coolant level to see if there is any coolant in the radiator. If there is no coolant in the radiator, then fill up the radiator with water and perform a pressure test. Check to see where the coolant is draining out of and fix that item. If you cannot find the coolant leak, then check the engine oil and the transmission oil to see if they are milky. If the engine oil is milky, then the head gasket could be split and causing coolant to go into an oil jacket. If the transmission oil is milky, then the radiator has a split and is forcing coolant into the oil cooler on the radiator.

If the coolant is full and the engine is overheating, then there could be an issue with the thermostat, water pump, head gasket, or radiator cap. Check the radiator cap and see if it holds pressure. If the cap does not hold pressure, then replace the radiator cap. If the thermostat is not working, then the coolant will heat up quickly and either make the engine overheat fast or overheat at a high temperature, but not sever. A burned head gasket or a failed water pump will make the coolant overheat very quickly and cause the computer to perform a shut down. If you need further assistance with your vehicle, then seek out a professional, such as one from Your Mechanic, to help you with your engine overheating and shutting down while driving.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Heater blowing cool aur

It sounds like you may have a faulty thermostat that may not be allowing the temperature of the coolant to rise to the proper level before allowing it to flow through the heater core. You may also have a clogged...

Q: HVAC actuator problems

The actuators are geared to work back and forth. You may have positioned them in a way where they will not work properly. You should have moved the door until they matched the actuator and not the other way around....

Q: Engine sounding loud.

It sounds like your talking about engine oil that has mixed with your coolant, depending on where you find them mixed whether in the engine or radiator would be the first diagnostic information. Coolant in the engine usually means problems...

Related articles

What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.