MBenz W169 increasing temperature at idle ?!

[Xhemal]

Hi guys
So my MBenz W169 is increasing temperature at idle even above 80 C , but I turned off the car just to be safe , and after starting to drive temperature gets back to normaly ~60 C , what could be possibles wrong ?

 

[star]

Normal @ 60 is wrong, normal should be @80-90.

 

[Xhemal]

Normal @ 60 is wrong, normal should be @80-90.

well my car has 40-60-80-100-120 , so 80 is in midle , when i drive temp gets 60-65 C , at idle keeps increasing , i will check again in morning the driving temperature

 

[LostKiwi]

As Star, 80 minimum when driving. If it's lower than that your thermostat is faulty.

 

[Xhemal]

As Star, 80 minimum when driving. If it's lower than that your thermostat is faulty.

I will check again driving temperatures tomorrow but for sure that were under 80 , i have been driving like this for 1 year , and lately ik noticing that the air conditioning is not cooling enough too , anything related to thermot ?

 

[LostKiwi]

I will check again driving temperatures tomorrow but for sure that were under 80 , i have been driving like this for 1 year , and lately ik noticing that the air conditioning is not cooling enough too , anything related to thermot ?

No. Thermostat not working will affect heater but not cooling. That's probably an issue with your air conditioning - most likely needs a regas.

 

[Xhemal]

No. Thermostat not working will affect heater but not cooling. That's probably an issue with your air conditioning - most likely needs a regas.

what about water pump , i dont have a record when it has been changed , i have been driving for 1.5 year and not changed it , i dont have a record when did the precious owner changed it !

 

[LostKiwi]

Whilst water pumps do fail there is no set schedule to change them.
Fix your first problem - the failed thermostat before going looking for more parts to bug.

 

[Xhemal]

Whilst water pumps do fail there is no set schedule to change them.
Fix your first problem - the failed thermostat before going looking for more parts to bug.

I dont know how long before car reaches 80 C , but after driving some 10-15 km , i can confirm that the car temp stays under 60 C . Do you think that this temperature and failing thermostat is a problem for the engine ?

 

[LostKiwi]

Yes.

 

[Blobcat]

It should get to temp (80-90’) within 12-15 minutes of driving (depending upon ambient temperature and driving conditions)

 

[Xhemal]

It should get to temp (80-90’) within 12-15 minutes of driving (depending upon ambient temperature and driving conditions)

It gets around 60-65 , after 15-20 mins of driving .

 

[Blobcat]

Knackered thermostat as previously advised

 

[Xhemal]

Knackered thermostat as previously advised

How dangerous is driving like this , i have been driving for a year or more like this ?! How urgent is changing the thermostat?!

 

[Blobcat]

Increased fuel usage and poor emissions due to engine not reaching temperature. Engine management running incorrect curling as it thinks it’s still on the warm up cycle.
Just replace the stat now...

 

[Xhemal]

Increased fuel usage and poor emissions due to engine not reaching temperature. Engine management running incorrect curling as it thinks it’s still on the warm up cycle.
Just replace the stat now...

in the system it shows correct fuel mileage , meaby it spends more and not showing correct data on display

 

[Xhemal]

Will change it ASAP , hope it wont kill my wallet , living in a country where normal sallary is 350 euro

 

[Flyinspanner]

Possibly temp sensor?

 

[LostKiwi]

Possibly temp sensor?

Unlikely as it's varying. Has all the classic symptoms of a failed thermostat

 

[Xhemal]

Unlikely as it's varying. Has all the classic symptoms of a failed thermostat

Yeah taled to a mechanic yesterday and he confirmed to that its a stuck open thermostat, however he told me that now during summer its not a problem for engine to drive like that, but till winter its better to change it.