Does anyone have any ideas on how to boost the output on a 123 A/C. I just spent a bucket of cash on a new compressor and a gagle of other parts and had the whole system serviced, and I wish it would blow harder! It seems to work like it's supposed to and the fan sure sounds like it's on full blast...and the system does work, better than having no A/C, but maybe there is a way to mickey mouse a more powerfull fan under there. I've been told that they never were that good to begin with so maybe someone has an idea on how to beef it up.

Anyone?

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1982 300D Turbo "Helga"
380,000 miles

If your state allows, then apply window tinting. Should help quite a bit, and is probably the best and cheapest way to go.

Phil

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'95 E300 Diesel, 264,000 Miles. [Sold it]

If you're not getting as much "in your face" air flow as you'd like, have you checked to see if some of the airflow isn't being sent up the defrost vents?


-- eskimo

You are so right on with that one. Today I took off the under dash panel and pulled down the vacuum element under there with my hand and presto! Blasting through the main vents. I think it has more to do with the switchover valves behind the climate control unit then the element. There was no suction coming from the bottom vacuum hose at any time. I changed one 2 years ago and will be changing the remaining 4 as soon as I get paid. Are you paying attention Phil at Parts Shop? Hope they are in stock!

If anyone else knows the answer feel free to let me know what it is.

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1982 300D Turbo "Helga"
380,000 miles

Spend $5 or so on a dial thermometer and put it in your a/c vent. Also know the outside temperature at the same time. Post the results here.

There are many things besides the refrigeration system itself that can cause your system to cool less than effectively. With vent temps we can start the process.

Have a great day,

Where are the interior temperature sensors on 126's? On my SDL, I just got the vacuum fixed and I get tons of air out of the center vents now. BUT, the fan does not ramp down when it is on AUTO like it seemed to when too much air was coming out of the defroster vent. In other words, it seems like the thermostat is not working to signal the fan to slow down. It is always on high unless I turn temp control to nearly warm.

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Alan Hamm
'87 300SDL 277K Miles
'89 560 SL 68K Miles

Yes, it indeed sounds like the blower is not working or the tube is not in place. As far as where it is located on a 126, me no speaky 126!

You are very likely on the right track in your diagnosis.

Have a great day,

I messed around under the dash today and found out that the vacuum element above the gas pedal is what directs the air flow from defroster to dash vents. It is a two stage element that corresponds with the two settings, mix dash and defroster, and dash only. There are two suction lines going to it to operate each stage so that it will take either some, or all or the air and direct it to the dash vents. Here lies the problem. The bottom line has no suction. Ironically it goes right to the only one of the 5 switchover valves I ever replaced. I guess it must be faulty but it is almost brand new. Could this be possible?

Long story short, I just switched the lines so that the one with suction operates the larger stage and bent the metal actuator arm the remaining half inch.

As far as I can tell everything works normal. The defroster kicks up to the top, the heat works great (I never had floor vents), and the AC puts out like it should. The only loss is that I can't use the mix setting. If I want defroster I have to set it to defrost only...boo hoo.

I would like it to all work properly and will at some point endeavor to change all 5 switchover valves but at this point, It aint broke so I might as well not fix it...

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1982 300D Turbo "Helga"
380,000 miles