HI Guys,

2 of 4 AC vents blowing HOT others COLD??

98 W210 E300D

I have something I haven’t run across before... When Im running the AC Half of my Vents are blowing warm and the others are ICE COLD.

I pulled the tiny pistons out of the housing (that the rad lines go through) in the engine bay (passenger side) since I read that it could be stuck. They were not stuck. Put them back in put a bit of Freon in it but didn’t really need it.

Its getting HOT in FLORIDA now and would love to have all vents blowing ICE COLD!!! HAHA


I understand there is some kind of hoses or assembly under the back seat? Assuming I did everything right above...

What do I try next???

Thanks Chris

Engine on and at op temp, AC set to 72. Press and hold REST for 5 secs. Use AUTO buttons to toggle through first 8 screens. Post that data.

__________________
Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)

Had the same problem, and it was no more than a charge. Yet, pull the data as Terry says. I had to do that eventuially as a sensor in the evap was misreading things.

thanks... Ill try that and report back..

C

Ok that was kinda weird...

I followed the steps.

I had one code on the left side and another on the right

1-05
2-94
3-62
4-50
5-43
6-17.2
7-10.3
8-10.5
9-30
10-.9
11-3.2
12-4.3

then it goes up to 22 then jumps to 40 with different codes.

What does all that mean??

C

Does this help...???

How will that tell me why my two vents arent blowing cold?

#1 is exterior temp. Was it 105F or 5C when you did this?

#6 is coolant temp. You did not let your engine warm up first.

3,4 & 5 are refrigerant temps. L/R & Evap. Left is warm which may be because the engine was just turned on prior to pulling the AC values. You should do them again.

Go here and pull your error codes from the AC system.
http://www.eclassbenz.com/2010/02/how-to-diagnose-air-conditioning-malfunctions/

__________________
Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)

HI,

I went to get the numbers again and though I never really noticed it the right hand side of the AC panel doesnt have all the digital "arms/legs" to the read out.

This is why my numbers dont make much sense. I have read outs like backwards "C" ect. Some just look like 'I's"

Any "BEST GUESS" why the left side vents are blowing warm and the right side ones are blowing quite cold with the AC on??

Love to try something that doesnt envolve me tearing out the dashboard. HAHA

I followed the directions of the site that was recommended and the only Error code I could make sense out of is



E61 on left and 234 on right



???

Low refrigerant fill, a restriction in the system, or the presence of air in the system.

Get the system evacuated and recharged to weight, and see how it performs. If it is still not working properly, or if the high-side pressure is too high, there is a restriction.

The Freon level is fine and I swapped out the AC unit in the dash to see if that was the problem.

Nope still had the problem.

I have narrowed it down to the Heater Core unit next to the Big black Emssions unit on the left side of the engine bay.

Kind of a bear to get that out.. Any ideas?

thanks

You claim the fill is good which means you had it evacuated and recharged, Right? Thats the only way to know for sure......

You are prob low on refrig, or the duo-valve may be sticking. Duo-valve is the lil twin tower unit inside the emissions box. "Kartek" showed how to rebuild one in a thread. Step one is to whack it with a screwdriver handle a couple of times.

__________________
Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)

I vote for the duo-valve half stuck open.

__________________
-Evan


Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63


Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250

Me too.

Jim

__________________
Own:
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles

Owned:
1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)

I vote for low refrigerant.

__________________
Len
'59 220S Cabriolet-SOLD and living happily in Malta
'83 240D 351,500 miles original owner-SOLD
'88 560SL 41,000 miles - totaled and parted out
https://sites.google.com/site/mercedesstuff/home
'99 E300 turbo 227,500 miles
'03 SLK320 40,000 miles - gave to my daughter
'14 Smart electric coupe 28,500 miles
'14 Smart electric cabriolet 28,500 miles
'15 Smart electric coupe 28,000 miles