In both my Benzes I've noticed that with the climate control off I still have outside air (cold in the winter and hot in the summer) coming out the vents. I'm guessing there's some kind of flap that's supposed to be Normally Closed that's not. Is that right? If that's the case, where is it (on a w123 and a w124)?

It's not that bad in winter... actually I was happy about it this past winter (don't laugh) because my blower motor was hosed and I'd turn the CCU to full hot and turn it on ECON and it'd let the hot coolant flow through the heater core, the cold air coming in from the high speed outside air coming in would pass the heater core and heat the car quite nicely even without the blower motor running (it was dead).

But not the case in the summer (not cool at all!)... I've repaired the blower and now all it does is warm up my A/C. I don't want outside air inside, I want to re-circ the cool air instead of slightly chill the hot outside air.

Looking for insight into this.
thanks!!
Nick

__________________
-E300d '99 350k
-Suburban '93 220k
-TDI Jetta '03 350k
Sold
-F250 '96 7.3
-Dodge Ram 12V
-E320 '95 200k
-E320 Wagon 1994 155k
-300d Turbo '87 187k miles
-E320 1994 200k
-300d Turbo '84 245k (sold to Dan62)
-300d Turbo '84 180k
-300sd '80 300k
-7.3 Powerstroke Diesel 15P Van 500k+ miles
-190d '89 Non Turbo 2.5 5cyl 240k (my first MB)
Tom's Imports of Columbia MO Ruined the IP in changing leaky delivery valve O-Rings - Refused to stand behind his work. Mid-MO MB drivers-AVOID Tom's.

The recirc flap is supposed to open when the A/C is on. Check the actuator and valve that controls it.

Thanks Lance. Anyone got an idea where that's at?

__________________
-E300d '99 350k
-Suburban '93 220k
-TDI Jetta '03 350k
Sold
-F250 '96 7.3
-Dodge Ram 12V
-E320 '95 200k
-E320 Wagon 1994 155k
-300d Turbo '87 187k miles
-E320 1994 200k
-300d Turbo '84 245k (sold to Dan62)
-300d Turbo '84 180k
-300sd '80 300k
-7.3 Powerstroke Diesel 15P Van 500k+ miles
-190d '89 Non Turbo 2.5 5cyl 240k (my first MB)
Tom's Imports of Columbia MO Ruined the IP in changing leaky delivery valve O-Rings - Refused to stand behind his work. Mid-MO MB drivers-AVOID Tom's.

Also, is the recirc flap the reason air is always coming in through the vents if the car is moving? I've never had this with any other car but MB's. When the vehicle is in motion there's always a breeze coming from the vents. It's weird. I have had GM's, Fords, and other old USA made stuff and never had a breeze like I do in MBs. It's not the end of the world but it's a little annoying and seems to be messing up my A/C's performance.

__________________
-E300d '99 350k
-Suburban '93 220k
-TDI Jetta '03 350k
Sold
-F250 '96 7.3
-Dodge Ram 12V
-E320 '95 200k
-E320 Wagon 1994 155k
-300d Turbo '87 187k miles
-E320 1994 200k
-300d Turbo '84 245k (sold to Dan62)
-300d Turbo '84 180k
-300sd '80 300k
-7.3 Powerstroke Diesel 15P Van 500k+ miles
-190d '89 Non Turbo 2.5 5cyl 240k (my first MB)
Tom's Imports of Columbia MO Ruined the IP in changing leaky delivery valve O-Rings - Refused to stand behind his work. Mid-MO MB drivers-AVOID Tom's.

1984 300d turbo 147k
check the mono valve on the engine fire wall pass side, pull the 2 pin elect plug and remove the 4 screws on top, engine cold, buy a repair kit this site, pull out the glove box and vacuum test the actuator top rear of glove box right side

I'd bet on the 123 that the mono valve is indeed torn. I haven't used the heat yet this summer to test it LOL It was 107F today!!!

But about the breeze problem I'm having. Is the actuator for the flap what you're talking about behind the glove box? Same place on a 124 body?

__________________
-E300d '99 350k
-Suburban '93 220k
-TDI Jetta '03 350k
Sold
-F250 '96 7.3
-Dodge Ram 12V
-E320 '95 200k
-E320 Wagon 1994 155k
-300d Turbo '87 187k miles
-E320 1994 200k
-300d Turbo '84 245k (sold to Dan62)
-300d Turbo '84 180k
-300sd '80 300k
-7.3 Powerstroke Diesel 15P Van 500k+ miles
-190d '89 Non Turbo 2.5 5cyl 240k (my first MB)
Tom's Imports of Columbia MO Ruined the IP in changing leaky delivery valve O-Rings - Refused to stand behind his work. Mid-MO MB drivers-AVOID Tom's.

the re-circ flap is behind the glove box, if it is open you will see a big hole in the side top of the blower casing.

__________________
1985 300TD Turbo Euro-wagon
1979 280CE 225,200 miles
1985 300D Turbo 264,000 miles
1976 240D 190,000 miles
1979 300TD 220,000

GONE but not forgotten
1976 300D 195,300 miles
1983 300D Turbo 175,000 miles

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