OJ's DNA

Climate control has worked perfectly since I bought it, on a 29 degree morning today, hour long drive with engine temp at 80 there was just no warm air blowing out the entire ride, has been working recently. All other operations appeared normal. I have not changed the coolant lately or anything like that - where should I start in trying to fix this issue? Thanks

kajtek1

Does defrost work?
This way, or the other taking duovalve for cleaning can be good procedure.

Wheeldon

The issue could be that the heating system is not receiving heat in order to circulate it. The engine's heat comes into the passenger cabin through the heater core. The hot coolant from the cooling system creates the warm effect inside. Check the coolant level and if that is fine then it could be an issue with the thermostat or the water pump.

OJ's DNA

Thanks, thermostat is new, did hear a crackling, weird sound from behind passenger side dash the last two mornings...not water sloshing but something else

E42AMG???

If your engine gets up to 80 defiantly not the thermostat.

Check the valve on the heater core

Plutoe

Save yourself loads of sausage---simply use the stickies and run the climate control fault test then post the faults and or the actual value test!!

OJ's DNA

You're right - forgot I could do that, here are climate control data followed by fault code data:

1 - 19
2 - 14
3 - 40
4 - 35
5 - 38
6 - 7
7 - 07
8 - 29
9 - 01
10 - 2.6
11 - 1.4
12 - 4.1
20 - 0.0
21 - 06
22 - 00
23 - 00
24 - 13.3
40 - 71
41 - 36
42 - 72
43 - 152


Fault codes - I had Eb1 on the left, on the right:
226
227
228
229
230
231
232
459
422


What does this mean W210 Guru's?

Plutoe

That's cool---save the data---then go back and clear all the faults----then run the car around and later today go back and just check the faults----which faults returned???

kajtek1

Buy new engine temperature sensor.

Plutoe

Don't buy anything until you have finished testing!!

OJ's DNA

Okay, cleared codes last night, changed oil and filter (it was just due) and drove 55 miles this morning. Turned car off, then back to position 2 to check codes again, no codes. I only got the FF on the right side of the display.

Plutoe

Once again that is great-----FF=no faults======however the issue is --do you have heat???

PS: be cautious of boneheads\spammers suggesting the purchase of parts when none are needed, complete the tests first

OJ's DNA

Actually I do have heat but it is sporadic, sometimes barely warm then 10 min down the road feels like no heat again. I do hear what sounds like water sloshing around behind passenger foot well. Good news is heated seats still work!

Plutoe

If that is the case then you must have taken the data when the engine was cold--look at post 2------number 3,4 and 6---3 and 4 is the duovalve and 6 is the engine coolant temp---they are cold when should be hot to get heat!!

The sloshing around on the passanger side is where the duovalve is located(not foot well)

OJ's DNA

I promise you the engine was warm, I took the codes within 20 minutes of an hour long drive at 70 mph...But I can take the codes again right after driving, this is not a problem...

Plutoe

Well if you want to come to any conclusion, after clearing faults, then you should also do the actual value test again and compare the data!!

OJ's DNA

After 1 hour drive, no fault codes stored after 2 or 3 drives covering 200 miles after I initially cleared the codes. Below are the comparison of the actual sensor values. 1st # was taken a few days ago after hour drive, the 2nd number was taken about 30 min ago after hour long drive, ambient air about 45 degrees.

1 - 19 / 23
2 - 14 / 26
3 - 40 / 35
4 - 35 / 12
5 - 38 / 37
6 - 7 / 85
7 - 07 / 09
8 - 29 / 39
9 - 01 / 01
10 - 2.6 / 0.8
11 - 1.4 / 1.2
12 - 4.1 / 14.3
20 - 0.0 / 0.0
21 - 06 / 06
22 - 00 / 00
23 - 00 / 100
24 - 13.3 / 13.1
40 - 71 / 71
41 - 36 / 36
42 - 72 / 72
43 - 152 / missed this one

Plutoe

Wada conundrum---all reporting very low----no faults---If this was my car, hopefully I have a friend with a W210 that I could swap AC controllers and then do the actual value test with (his\her\lgbt) AC controller.-----wada I get!!

Outside of that I still would not buy and bonehead part!!

kajtek1

Quite a ride you've been taken on DNA.
Your system had bunch of communication errors, but they did not come back, so hopefully it was low battery voltage at one time, or loose plug.
Check the plugs and don't save MAF cleaners on them.
Than do proper test reading starting in the morning before you start the engine.
Only 1-8 sensors are crucial. Tell us what temperatures are set as your system seem to turn AC on at 45F outdoor.
Your engine temp sensor after 1st failure read on the 2nd test, but still after morning test, I would leave #6 on and observe how it changes during warming up.
Another suspect is evaporator sensor #5

OJ's DNA

I did a 3rd reading while driving at 60 mph, again car at temp about 45 degrees ambient temp outside. Most of the time set at 72, with EC on last few days although this morning had ac on to prevent fogging.

1 - 19 / 23 / 23
2 - 14 / 26 / 16
3 - 40 / 35 / 33
4 - 35 / 12 / 15
5 - 38 / 37 / 39
6 - 7 / 85 / 81
7 - 07 / 09 / 04
8 - 29 / 39 /16
9 - 01 / 01 / 02
10 - 2.6 / 0.8 /1.8
11 - 1.4 / 1.2 1.3
12 - 4.1 / 14.3 / 4.1
20 - 0.0 / 0.0 / 0
21 - 06 / 06 / 25
22 - 00 / 00 / 102
23 - 00 / 100 / 100
24 - 13.3 / 13.1 /13.1
40 - 71 / 71 / ...
41 - 36 / 36 / 71
42 - 72 / 72 / 72
43 - 152 / missed this one / 152
__________________

kajtek1

23C=75F so you did get heat in the cabin.
Also do the cabin sensor fan test with chunk of paper stick to the slot.
The evaporator sensor looks shot, but morning reading would be final confirmation.
Question how bad evaporator sensor can affect your heating, but using AC for defogging might put whole software in loop.

pamiboy

Do you get regular air from the vents (regardless or heated or cooled) when the car is stationary?

OJ's DNA

Yes, regular air everything rather normal. Have had heat now for 2 day however, not hot or real warm like it used to be.

Kajtek - so take readings in morning before car has been run? Or get it warm first, shut off then take readings?

OJ's DNA

Just a follow up, I did not drive the diesel much during the holidays, now back to work and I noticed one weird thing. When I'm at low speeds, say from the house to the grocery store across the street I feel heat coming from the vents, when I'm on the highway rolling at 70 mph, no heat.

Anyway, I'm going to perform the duo valve repair and see what happens.