Skip the auto shop - Our mechanics make house calls

Q: Engine switch off

asked by on

I was driving on motorway for about 4 hours and half when my engine got to warm when I was on trafic. The car switch off and I had to wait 20 min to start the car. It happen again but this time the engine was only on 80c degrees. Te next day when driving to work the car was running fine until I stopped on trafic lights, the car then switch the engine off but the temperature was only 80c. I had to wait 20 min to start the car again. The oil and the coolant levels are good. Can you say what might be the problem? If it is the CPS or the thermostat? Thanks Bruno

My car has 83000 miles.
My car has an automatic transmission.

A: Hey there, thanks for asking about your 200...

Hey there, thanks for asking about your 2005 Smart Fortwo. When a car overheats in traffic, it’s a pretty sure sign your cooling fans are not working. You can test this by letting your car fully warm up and observing this at home. Depending on the weather, it will take sometime for it to fully warm. The first thing to watch for is the thermostat to open. You can know when it opens by feeling the upper radiator hose. It will be cold until the thermostat opens, at which time it will become hot. At this point, your car is still not warm enough to turn the radiator cooling fan on.

Make sure you watch your temperature gauge while you are doing all this. If the gauge gets hot and the upper radiator hose is still cold, it’s time to replace the thermostat. If the upper radiator hose and the gauge gets hot, but the radiator cooling fan does not turn on, the cooling fan operation will need to be diagnosed.

As for the dying, this seems to happen while you are at a stop. This indicates the overheating problem may have damaged a computer module. CPU’s are sensitive to heat. The first overheating event may have damaged the CPU or ignition module so that as soon as they begin to get hotter than they should, the module will quit working. This is a very common occurrence with electrical modules.

If you should need assistance, I recommend you have a certified technician from YourMechanic inspect why your car is overheating](https://www.yourmechanic.com/services/car-is-overheating-inspection).

Keep in mind, the damage to the module is already done. But it may not need replacement as long as the car doesn’t get hotter than it can handle; it may still last for the life of the car.

Good luck!

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: radio does not turn on with car, seat heating will not turn on, and windshield wipers do not work.

Hi there. In general, when you have multiple electrical problems that occur as you've described, it's typically caused by a damaged electrical relay that powers accessories and ancillary components such as the windshield wipers. It's best to have a professional...

Q: Car won't run over certain mileage

If there are any Check Engine lights or other dash lights on, the car might be stuck in limp home mode. This is a computer failsafe mode that disables certain features for passenger safety because it has detected a major...

Q: I keep getting a cylinder 3 misfire code P0303. I have replaced the spark plugs and ignition coils and have had no luck.

Hello There, You may want to try checking things like mass air flow sensor, fuel pressure, injector connections/pulses, etc. Often times, when these components are not working properly or causing a lean fuel condition, this may cause a misfire...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...