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: Drop in engine compression.

Loss of compression in an engine is a serious problem that usually results in a complete engine rebuild or replacement. Since this is a big job to diagnose, it is very important you have a certified mobile mechanic look over...

Q: Changed alternator now car seems to be in creeper mode.

Hi there. If the engine is not accelerating after replacing the alternator, then check the alternator and see if its charging the battery. Look at the cables and make sure that they are hooked up correctly. If the alternator is...

Q: Heater not working 2005 Acura TL

Hello - you may have a bad water pump and clogged radiator. When engine overheating occurs at low engine speeds, it indicates the engine is unable to transfer heat to the radiator and cool the engine. It would also result...

Related articles

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...
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...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.