I have a 2010 Mercedes E350 4 magic that when I drive the temperature usually runs at 90 degrees.  Lately the temperature will spike to close to 120.   If I shut down the hvac system,   the temperature shortly returns to normal.     There are no cel codes.

 

The thermostat was replaced last year..   Since the conditions corrects itself when the temperature control panel is turned off, I am thinking it might be the temperature control switch that is near the thermostat.

Comments

Hi Tom. I agree this may be the issue with a sensor but I am not sure if it is the engine temperature sensor. I think if that was the case, it would overhead all the time. What I recommend is that you either get a scanner that can read Mercedes codes in all systems or have someone with star diagnostic scanner scann the system.

I guarnette that there will be a code stored, in one of the modules. It may even be a code in the Air Conditioner Control module.

Let us know what you find out.

Hi dear Tomr, Have you figured out the problem yet? If not, maybe you want to read the check engine codes and post them here

Make sure to see if the radiator fan runs when you turn on your ac. The cooling system on this vehicle is very efficient and may not get too warm if the fan doesn’t work. 

Went back to old school basics.    Since problem occurred after the thermostat was changed,  I decided to "burp" the cooling system.   Ran car with radiator cap off until fan went on.   Seams to have done the trick, but time will tell,

 

I know I should check for codes.  Can anyone recommend a scanner that will read the codes.  The ond2 scanner only reads engine fault codes.  

 

Thanks for your help.

 

Have a great 2018 Holiday

Went back to old school basics.    Since problem occurred after the thermostat was changed,  I decided to "burp" the cooling system.   Ran car with radiator cap off until fan went on.   Seams to have done the trick, but time will tell,

 

I know I should check for codes.  Can anyone recommend a scanner that will read the codes.  The ond2 scanner only reads engine fault codes.  

 

Thanks for your help.

 

Have a great 2018 Holiday

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