E-Class (W210) 1995-2002: E 200, E 220D, E 240, E 290TD, E 300TD, E 200, E 240, E 280, E 320, E 420, E 430 (Wagon, Touring, 4Matic)

heat from vent is cooler than normal

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Old 01-20-2016, 01:39 AM
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e320
Question heat from vent is cooler than normal

2002 E320 126k miles, living in fl ,this morning 44 degree outside. Turn heat up to 80F,fan on level 4, air from vents is luke warm. Increase temp up to HI same effect from vents, fan on level 5. Change thermostat 2 yrs ago. Anyone has any suggestion.

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Danny Wongsam
Old 01-20-2016, 10:44 AM
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1922 Ford Model T / no OBD
Run sensor readings 1 to 8 three times and post results from;
1-cold car before morning engine start
2. car idling/engine cold after some parking mid-day
3. car idling with engine at about 80C
Old 01-20-2016, 11:08 AM
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1999 E300TD
Wow, must have made a good batch of sausage post 2 finally makes some sense, however, that is only half the story---the other half is after the car is a 80C and you do the actual value test---also run the fault test--that test will confirm the integrity of all the sensors and greatly add to the diagnostics.


PS: make sure you clear the faults the first time and then with the second test ---do any of the faults return??

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