Hi
I'm a lot puzzled about the way my ventilation system is behaving and wonder if this makes sense to anyone.
The car is a 1998/9 C200 W202 20k miles - fan dial on left, direction on the right with Rest and EC button in the middle. Air-con re-gassed by Indy but problem existed before.
I prefer to run with EC off - i.e. the red light in the EC button should be ON.
However, after starting the car the light is OFF for a period of time. This period does not seem to be affected by outside heat, but on the last few cold mornings it has stayed off longer - say about 20 minutes as opposed to around 10 normally. After that the light flickers on, and then the fan comes on - even though it is set to the 0 position.
If I have the window open this happens much sooner. After this it is not possible to switch to fan off - cos the knob is already in the off position!
With the temp dial set at full blue it blows ambient air, just a single notch of blue brings warm air through the side vent and slightly warm through the centre.
Set to White and it is too hot to breathe in no time.
I would like to be able to stop this fan running unless I want it, but am at a bit of a loss as to how to do it - unless it is simply the dial/rheostat has gone funny.
With the EC enabled you get better temp control obviously, but still cannot switch the damn fan off!
Given the reaction to open window I'm thinking some sort of interior temp sensor issue, does this live in the interior light cluster - I think I recall seeing a post about a sensor fan in the boot???
Any thoughts or suggestions very welcome.
bin
I'm a lot puzzled about the way my ventilation system is behaving and wonder if this makes sense to anyone.
The car is a 1998/9 C200 W202 20k miles - fan dial on left, direction on the right with Rest and EC button in the middle. Air-con re-gassed by Indy but problem existed before.
I prefer to run with EC off - i.e. the red light in the EC button should be ON.
However, after starting the car the light is OFF for a period of time. This period does not seem to be affected by outside heat, but on the last few cold mornings it has stayed off longer - say about 20 minutes as opposed to around 10 normally. After that the light flickers on, and then the fan comes on - even though it is set to the 0 position.
If I have the window open this happens much sooner. After this it is not possible to switch to fan off - cos the knob is already in the off position!
With the temp dial set at full blue it blows ambient air, just a single notch of blue brings warm air through the side vent and slightly warm through the centre.
Set to White and it is too hot to breathe in no time.
I would like to be able to stop this fan running unless I want it, but am at a bit of a loss as to how to do it - unless it is simply the dial/rheostat has gone funny.
With the EC enabled you get better temp control obviously, but still cannot switch the damn fan off!
Given the reaction to open window I'm thinking some sort of interior temp sensor issue, does this live in the interior light cluster - I think I recall seeing a post about a sensor fan in the boot???
Any thoughts or suggestions very welcome.
bin
