Question about 1997 Mercedes-Benz C-Class

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Cuts out when it gets warm

Its a petrol automatic,runs fine til it gets to about 80 degrees then cuts out and wont start til the temperature gets back down below 40 degrees.

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Most common issue(and cheapest), is a crankshaft position sensor. Try this first and let me know.

Posted on Nov 14, 2008

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1 Answer

Starts but cuts out 4/5 times on morning wont rev then starts and runs fine


the temperature sensor for the computer not the gauge is telling the computer erroneously that the engine is warm and the computer leans the fuel so much so that you get the cutouts and hestitation. then after a while the engine really is warm and that fuel mixture works fine.

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Too much time to warm up to 90c on winter, cabin heating is ok after 2km


System is functioning normally at this time, no action is required.

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I have a Mercedes benz c240 sport v6 engine the car starts up fine and then when it reaches temperature 80 degrees the car cuts off.


Seems a common fault i have had with these cars ,try changing the crank and cam sensor ,you will not get a fault light but one or the other could be breaking down when its gets warm .

Aug 22, 2013 | Mercedes-Benz Cars & Trucks

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Car does not heat up despite debater being on and letting ca run for 15 minutes


There are several things which come to mind. You have 2 complaints. A gas smell and a cold blooded vehicle.

Starting with the temperature problem. My initial concern is whether the thermostat is weak, but also that the automatic controls may be inoperable and working against you. The car is suppose to go into a temporary "cold start routine" which increases the RPM and makes the fuel rich. (This could contribute to the gas smell)

After the Temperature sensor and O2 sensors warm up, the idle is suppose to drop and the fuel mix should lean out. If the engine remains at high idle, the water pump will work faster with the engine spinning faster. Sometimes there is not a direct 1 to 1 ratio between the heat generated by the motor and the RPM versus the cooling produced. An idling engine may warm up faster than an engine running at higher RPM.

Another problem may be the Defroster setting. There are Thermal switches which are suppose to cut off the Electric Radiator cooling fans. When the Defroster is activated, some cars are built to spin the A/C compressor in the Winter. But the Electric Radiator cooling fans may also switch on as part of the A/C system. This would super cool the radiator at a time when you least want it. Check to see if the cooling fans are activating when the Defroster is turned on.

There can be 2 Temperature switches in your car. One would send the signal to kick out the "cold start routine" and the other would work the guages or indicator lights.

The O2 sensors can have heaters in them or they can just be slow. If you leave the engine idling like you do, they could foul out and be sluggish to warm up.

If running the Temperature at 80 degrees causes an additional 5 minutes of warm-up time, you may be better off setting it for say 72 and having it work sooner.

The thermal sensors are not that expensive. Work on a cold engine when changing them. Note what I said about your rich fuel mix contributing to the smell.

Please rate my info.

Jan 05, 2013 | 2005 Ford Five Hundred

2 Answers

2002 chevy malibu heats up when running at low speeds


CHECK THE THERMOSTAT. THERMOSTAT IS THE ONE THAT SENSE THE ENGINE TEMPERATURE AND TURNS ON COOLING FAN WHEN THE ENGINE IS HOT.

Jan 19, 2012 | 2002 Chevrolet Malibu

1 Answer

Temperature going upto 80 degrees


It.s very,very normal. For example-your thermostat opens at 87 C.for petrol engines and 93 for diesel engines.

Nov 30, 2009 | 1997 Mercedes-Benz C-Class

1 Answer

Merc 280 cuts out at just above the 80 cent level


It is a good car. You just have a minor problem. Replace all thermal sensors on top of your engine. One to control the cold start valve, itf it is bad it gives erractic resistance to confuse the ECU. One is to turn on the electric fan when the engine temperature hot. If it is bad giving out of range resistance reading, then you have the described symptom. Good luck.

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1 Answer

Runs great til it warms up


Could be the engine temperature sensor faulty. Replace

Jun 26, 2009 | 1988 Subaru XT6

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