A180 W176 Only blowing ambient air

[maldini40]

Hi All, I have a A180 2014 diesel which only blows ambient air inside the car. Had it on and OBD with a garage and it came up with Evaporator Temp sensor fault (open circuit). Have replaced that now (with this) but it hasn't made any difference. Have checked all fuses, non blown. Near where the temp sensor the two large metal pipes which go into the blower unit?? are hot, so it seems heat is getting into the cabin. Doesn't matter if A/C is on or not, just cool air coming from the vents. The blower is working, blowing at a decent rate through all the speeds. Could it be a fault with the heating controller itself? Any ideas/thoughts. Really am desperate now! Thanks in advance.

 

[Uncle Benz]

Are you certain that you replaced the evaporator temperature sensor? There are several temperature sensors inside the car. The evaporator sensor usually has a kink in it where it pokes into the heater casing so it sits near the centre of the evaporator core. To be fair I have never changed one in an A class, but have done plenty in w204 C class

 

[maldini40]

Thanks for the reply Uncle Benz. I’m pretty certain, checked with mercedes parts dept and did a fair bit of research but I could still be wrong. The part does have a kink, I put a link in my first post but I’ll take a pick of the part and where I fitted it tomorrow and post them.

 

[maldini40]

Just thought to add also, I bought the car from the police and it hadn’t been used for a couple of years. They put in a new battery and I’ve replaced the auxiliary battery as that was dead. Could the fact the car hasn’t been used for so long affect anything? Or the dead batteries mess with the heating system? I’ve searched for heating resets but couldn’t find anything for my car.

 

[maldini40]

Here’s the part
And here’s where it fits. It’s in the passenger footwell to the left of the cabin filter. Hope that makes sense. The metal pipes in the pic get hot following a drive in the car.

 

[Uncle Benz]

That’s the correct sensor. That isn’t what you linked to in your first post though. That’s why I questioned it.