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82 240D, 85 300 TurboD, 94 E320, 97 E320
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17 Posts
Discussion Starter #1
OK - I just scored on a 70K mile 97, after parting with my dear old friend W124 with 164K. Overall, I still miss the solid old W124, but I am getting used to the W210. Saying that, there are a couple issues that I am experiencing that really stand out.

1) cold shifting: no, not the gear shift hold for the catalytic converter (though, that is annoying), rather the tranny shifts like a truck when cold - banging into the next gear and really not all that smooth. I can either wait 10 minutes and then drive the car, or drive the car for 10 minutes - either way, the shifting smooths out. About the same time the engine gets to 80deg.

2) the heater fan comes on immediately when cold. It doesn't wait until the engine is warm enough to give cabin heat and then start to blow. The W124 was just right - just wait and then a smooth flow of warm air when ready.

Here's the question - are these related? It seems that the car doesn't know when the engine is warm or cold. I don't have any CEL codes and I even checked for ECT sensor codes through the Climate Control, looking for B1231 - nothing.

I heard replacing O2 sensors will smooth things out in the tranny. That seems related to shift holds when cold, so I'm not convinced.

3) Lastly - so sorry - but I am planning to do a tranny oil change due to the extensive stickies in this forum. At 70K it's time. Can anyone vouch for Maxlife ATF vs. 722.9 MB fluid? Late tech bulletin says Maxlife in fine print but 722.9 oil is supposed to give upgraded life and shifting to 722.6 tranny.

Thanks all, nidge
 

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1999 E55, 2001 E320, 1990 560 SEC, 2004 ML350, 2001 ML55, 1995 S500, 1998 SL500, 2010 E550 Sport zoo
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7,035 Posts
On the tranny, your very best bet:

1) do a tranny reset procedure withyour key and ignition, which takes all of 4 minutes, and see if there is any change in tranny performance

2) Replace your tranny connector plug right away, and see if you had had zero-minor-major leakage in that plug, which may lead you to the conductor plate later.

3) Indie or the very best tranny fluid change you can budget - and for 9 bottles of fluid for a full pump out and exchange, it's NO 722.9/forward is NOT best choice for our 722.6 tranny. The BEST choice for replacement fluid is the original 722.6.

Both my indie and dealer mechanic have seen (2) types of problems; one a "mix" problem where the .9 gets mixed in with the remaning .6, and no one knows where that leads except to the wierd fluid mix for the tranny. And even full pump outs and refills .9 in some .6 tranny's with milage have caused shifting fresh/new snapsih issues and ultimately premature tranny failure.

Proper maintenance of the .6 tranny with the correct spec fluid (disreagrding the original pee poor sealed for life instruction) leads to a almost bomproof trany (connector plug is the exception) with well over 200K mile life - so why frick with that ?

On your climate control issue - do the climate control self-diagnostic and see if any trouble codes come out.

Whoever gave you "advice" the climate control issue is O2 sensor - thats a new one all bullticky. Whoever was trying to slide you that one either better have hard and deep diagnostic codes in hand from a scan or they are a horses arse.

Do the reset, put fresh OE filters (including air) and fresh OE fluids in the car incl the tranny (fliter change there too), clean the MAF so you know what it is, and see where that takes you.

Keep the faith - and disregard inexpereinced advice.
 

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2001 E320 - Brilliant Silver/Ash: 107,000+
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17,193 Posts
...2) the heater fan comes on immediately when cold. It doesn't wait until the engine is warm enough to give cabin heat and then start to blow. The W124 was just right - just wait and then a smooth flow of warm air when ready...
Yeah mine does that too. I didn't realize the W124 system was that different in this regard. If it bothers you I'd just decrease the fan speed until you see the engine temp at close to 80C. Welcome to the forum and to the W210 section!
 

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82 240D, 85 300 TurboD, 94 E320, 97 E320
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17 Posts
Discussion Starter #4
Thanks for the replies - still a little confusion on a couple points;

1) I agree with sticking with the design-purpose oil is the safest bet:thumbsup:, but there is a forum stickie that states :

What Fluid Can I Use For The 722.6 Transmission?

Well, there is a short answer, an intermediate answer, and a long answer.

The short answer is that you just use the genuine Mercedes ATF for the 722.6 or the 722.9 transmissions. You will not lose any sleep during the night and there are three different fluids you can use in the W210 722.6 transmission. (These fluids cost approximately $12 - 15 per liter).

MB 236.10 sheet - ATF 3403, aka 722.6 fluid (MB Part # 001-989-21-03-10)
MB 236.12 sheet - ATF 3353, aka 722.9 fluid (MB Part # 001-989-45-03-10)
MB 236.14 sheet - ATF 134 or 4134, aka "new" 722.9 fluid (MB Part # 001-989-68-03-10)

Mercedes always recommends the latest fluid for the 722.6 transmission but there is nothing wrong to use the older fluids (your car came with the 236.10 fluid).

http://www.benzworld.org/forums/w210-e-class/1463460-mercedes-benz-722-6-transmission-faq.html

It's that last sentence that has my head scratching. No mention of oil mixing (though that's a valid line of thinking). This author louabache also states he uses the Maxlife, though I will stick with M-B oil. So you see my confusion.:surrender:

2) I looked at my post and it was poorly written. I didn't intend to imply the O2 sensors are related to the Climate Control, rather related to the poor cold shifting. i.e. the CPU doesn't "know" the engine is up to temp because the control loops from the cat are not closing quick enough. Does this make sense?

3) I did run the Climate Control Diag and I get the B1422 - Series interface (K1) connection to instrument cluster (A1) error. Does anyone understand what this is or how it is corrected. I can't find it in the WIS or any other posts.

Thanks again, nidge
 

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1999 E55, 2001 E320, 1990 560 SEC, 2004 ML350, 2001 ML55, 1995 S500, 1998 SL500, 2010 E550 Sport zoo
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7,035 Posts
If Lou uses MaxLife, then its a valid option for you to decide.

I would not lose any sleep whatsoever over the obsure climate control code.

At 70K, your O2 sensors have a long-long way to go.

Your tranny reset and tranny service should take care of your major issue.

Keep the faith !
 
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