W203 C160 warm air only

[c class sport]

Can't seem to find any threads about this for petrol cars.
My W203 C160 seems to take forever to warm up, when you eventually get hot air from the heaters it doesn't last very long. I've also noticed that when using the car on short runs or even a long motorway journey the engine temp never seems to rise above 40 degrees, is this normal?

All of the air is coming out of the right vents when requested so don't think I need to reset the flaps but just not sure where to head next?

Any advise would be helpful as its currently snowing here and I'd like hot air haha.

Thanks


Andrew...

 

[Ken_R]

See previous thread concerning thermostat.

http://forums.mercedesclub.org.uk/index.php?threads/w203-coolant-thermostat-s-sanity-check.165438/

Regardless of engine, they all work much the same.

 

[mercedes13156]

Can I suggest you remove the cabin filter as well. I had the same symptoms on my previous W203 Coupe. The cabin filter was so dirty the muck on it broke off in sheets when I pulled it out. Replacing it restored normal air movement in the heaters and I got full functionality back as well as more heat.

Changing the thermostat will also restore normal temperatures.

 

[c class sport]

See previous thread concerning thermostat.

http://forums.mercedesclub.org.uk/index.php?threads/w203-coolant-thermostat-s-sanity-check.165438/

Regardless of engine, they all work much the same.

Thank you, I shall follow those tips and test the temp of the rad and pipes, that would be a quick inexpensive fix if just the thermostat.

Thanks

 

[c class sport]

Can I suggest you remove the cabin filter as well. I had the same symptoms on my previous W203 Coupe. The cabin filter was so dirty the muck on it broke off in sheets when I pulled it out. Replacing it restored normal air movement in the heaters and I got full functionality back as well as more heat.

Changing the thermostat will also restore normal temperatures.

Thank You, is the cabin filter the filter above the battery under the bonnet or is there another one some where else?

Thanks

 

[daibevan]

Thank You, is the cabin filter the filter above the battery under the bonnet or is there another one some where else?

Thanks

It is on mine, a 5 min job to replace ,if you do it slowly.

 

[Lord_Lucan]

It is on mine, a 5 min job to replace ,if you do it slowly.

Was the same on my W203 (when I had it) too. Really easy job

 

[the red barron]

Strangely enough we had this same issue in this recent cold spell, changed the thermostat and the car is toastie in 5 minutes.

 

[Darren197128]

Hi, my Mercedes C180 Kompressor temperature gauge doesn’t get above 45deg. The heater vents only get slightly warm and never what I would call hot. Even after 1/2hr of driving.
Any ideas?

 

[AMGeed]

Hi, my Mercedes C180 Kompressor temperature gauge doesn’t get above 45deg. The heater vents only get slightly warm and never what I would call hot. Even after 1/2hr of driving.
Any ideas?

Get the thermostat replaced, preferrably with one from the dealer. The gauge should read around 85c
You'll find your fuel consumption better afterwards too.