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[Simon72]

I know I have asked a similar question before and someone answered part of the question about temperature activation BUT

The diesel heater thing under the front bumper (O/Side) I have been told should work when outside temperature is below a certain temperature. My problem is it has been well below 0deg C the past few days and when I have started the car from cold the heater thing doesn't seam to be working. (No fumes coming from its exhaust or even the silencer bit stone cold)

Is there a way of testing it or has it got a fuse to make it work, or do they get disabled in the UK due to not much need?

Would be grateful of the help on how and when it actually works, and how to make it work.

Regards

Simon

[Boditza]

i'm looking for the same answers..mine wont start either

[2woody]

it's a coolant heater. Just burns diesel to heat up the coolant, probably fitted to give the heater a better chance of working. No idea on the "when should it run" strategy. Might get some idea from the Haynes manual

[Andy B]

it's a coolant heater. Just burns diesel to heat up the coolant, probably fitted to give the heater a better chance of working. No idea on the "when should it run" strategy. Might get some idea from the Haynes manual

That was a great help Stu! 
Stating  & obvious springs to mind! 

[Boditza]

it's a coolant heater. Just burns diesel to heat up the coolant, probably fitted to give the heater a better chance of working. No idea on the "when should it run" strategy. Might get some idea from the Haynes manual

That was a great help Stu! 
Stating  & obvious springs to mind! 

we already knew that

[Welung666]

It should run from first start up if the outside temp. is below a certain level (not sure on the setting). Check fuse 24 (20a)

[Boditza]

i can program it.. i have a mini clock inside... and it should start if i program it if the cooling water is below 70 degrees celsiuzs

[2woody]

the OP called it a "diesel heater" - i though he might be under the impression that it heated diesel, which would be an advantage in this sort of weather.

so apologies if i've told you something you already know.

[Andy B]

the OP called it a "diesel heater" - i though he might be under the impression that it heated diesel, which would be an advantage in this sort of weather.

so apologies if i've told you something you already know.

we're only pulling your leg 

[fiend61]

 below 70 degrees celsiuzs jesus that is mighty cold 

[feeutfo]

Its a Webasto heater, or made by, i believe.

A google will reveal far more than I can tell you about them.

A quick look reveals http://www.standkachels.com/   A Dutch site with some English sections.

They have numerous applications not just in cars afaict.

[2woody]

ok - so thinking on a bit, it's going to to need the following control strategy........

to switch ON if ambient temperature is below a certain limit, probably about 10degrees C

to switch OFF if the coolant temperature exceeds a certain limit, probably about 75degrees C

and it'll need an automatic lighting facility - some sort of glow-plug,which will be fragile.

so to diagnose, I'd look for the ambient temp sensor, the coolant temp sensor and the glow-plug.

[feeutfo]

...and going by my neighbours experience with his 530D Beemer, they are almost a sealed unit. Ended up with another unit from a breakers, wasn't cheap either iirc

But worth persuing and checking the above first.

[Simon72]

Cheers for the advice.

Right just been out and checked Fuse 24 (20amp) OK :-(

So its not the fuse.

Does anyone have a circuit diagram or pin layout for the plug on the unit so that I can test for Voltage etc. ?

Or even Model Number of the unit so I can search on the net myself.

Cheers

Simon

[2woody]

it's in the Haynes manual I think (although mine isn't here, so I can't check)