Help no heat! W203

C32Graham

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Oct 2, 2015
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49
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W126 300se E34 520
Not sure if this is engine or interior tbh but bit of an issue as its -5 this morning!

Car is a 2003 C32.

I have always thought that the heating has been poor on the car but never really worried. This cold snap has proved that its barely working at all. At best all I get is luke warm air after about 30mins.

I've done the reset and it just leaves the 2 lights flashing, I have no clicking noise to suggest a broken valve and I can hear all the air moving about during the test. I understand this means that its logged a fault. When looking through the history I found a receipt that notes post water pump change:
"unable to test heating due to heating system fault - customer aware"
so sounds like its not a new thing.

Any hints or tips? Bloody typical as Im trying to sell it!!!
 

Chrishazle

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2008 S204 C220CDI Elegance Estate Auto, 2008 R171 facelift SLK280 Auto.
On my 203 this was part of the effect of a faulty thermostat, the other effect being that the engine temperature never got above about 60 instead of getting to 80-90. Mine was a C270, wonder if you have the same (easily fixed) problem!
 
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C32Graham

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Oct 2, 2015
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W126 300se E34 520
Sadly I think not. Engine comes up to temp fine and sits at 85-90 fine.

Good shout though!
 
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C32Graham

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Oct 2, 2015
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W126 300se E34 520
For a bit of closure. Was at the garage yesterday. Diagnosed as either water pump or thermostat. Car had a water pump last year so booked in for a thermostat later today. Thank god, a nice cheap fix!
 

Rory

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If it gets up to temp OK, then odd that the heating is only like warm.
 

grumpyoldgit

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C270CDI Avantgarde SE
Suggest you get them to check that problem with reseting the heater flaps while they're doing the stat.
 

grumpyoldgit

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C270CDI Avantgarde SE
For a bit of closure. Was at the garage yesterday. Diagnosed as either water pump or thermostat. Car had a water pump last year so booked in for a thermostat later today. Thank god, a nice cheap fix!


Did a new stat solve the problem?
 

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