Re: [diesel_mercedes] Re: Troubleshooting '82 300D Climate Controls

 

I got my AC working in my 80 240, finally. It's been working great for about 2 years now. Before that we replaced everything except the compressor and the AC would work  for the short summer then leak over the winter, then next summer a shot of AC juice and it would work. I finally replaced the compressor and now, wow, it works good. Max


On Tue, Oct 22, 2013 at 7:36 AM, brian's 83 300d's <bstromsoe@yahoo.com> wrote:
Keep us posted as we all have A/C issues over time and can benefit from your experience. Every year I swear I will fix mine, but the So. Cal. weather is only hot hot for a couple of months, so I forget to take care of things.

brian from laverne

--- In diesel_mercedes@yahoogroups.com, <conrad.jacoby@...> wrote:
>
> The climate controls in my '82 300D haven't worked correctly since this car wandered into my life 5+ years ago.  I don't drive the car in sloppy/winter weather, so this hasn't been the biggest issue for me, but we're heading into a cold but dry fall, which is shaping up to be an excellent time to keep on chugging, so long as I can keep my hands from going numb while driving.
>
>  The monovalve seems to be working fine (I can regulate output air temperature) and I replaced the blower motor last fall because I was in a time crunch and didn't have time to fuss with changing out the brushes on the original blower.  Even then, though, I still had the standard symptoms that the climate control system will only operate in defrost mode.  The A/C is long non-functional, of course, due to an extended period of vehicular neglect prior my ownership; I'm just trying to get the economy modes to operate.
>
>  After returning from a short drive this afternoon, I pulled the climate control assembly this afternoon to inspect it for possible cracked solder joints.  A quick visual inspection doesn't show anything particularly dramatic on that front, though I'm going to re-flow all the edge connectors anyway.  However, I found that a portion of the system board was very warm to the touch, with circuit board discoloration where at least one relay is located.  Like I almost always do, except when I'm defrosting my windows, I run my car with the temperature wheel turned all the way down and the system turned off.  Shouldn't all power be cut to the climate controls in that mode? Should I actively be worried about a bad mechanical relay, or is what I'm seeing similar to the "always on" nature of the cruise control unit (at least until it fails)?
>
>
>  I hope to further disassemble the unit to expose both sides of the board tomorrow (ran out of time tonight).  Since this isn't the evil KLIMA I system and spares are generally available, should I start querying the list for a replacement set of controls (or boards) instead of potentially desoldering and replacing board components?
>
>
>  Thanks for any advice you can provide!
>
>
>  --Conrad J.
>




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Re: [diesel_mercedes] Re: door seal

 

Speaking of seals, I have a full NOS set for a 300D wagon if anyone is interested.  The price is $295 whether you're interested or not.

Al Boucher


On Tue, Oct 22, 2013 at 11:10 AM, brian's 83 300d's <bstromsoe@yahoo.com> wrote:
 

PS - I just saw that I posted some photo's which you can find under ?Brian's Door Seal? or something like that.

--- In diesel_mercedes@yahoogroups.com, "brian's 83 300d's" <bstromsoe@...> wrote:
>
> Max, I put on a drivers side front door seal without adhesive (maybe a dab just to hold things. The seals pretty much go in freely, but talcum powder is useful. I should have gotten an MB seal from Classic as the one I put on (from 2nd source) is a tad fat, so it is not a "perfect" fit.
>
> --- In diesel_mercedes@yahoogroups.com, <jasperezra@> wrote:
> >
> > Hey Brian, how did your seals go on? Did you use any glue? Did you just shove them in? Do they seal good? Where did you order them? max
> >
>




--
Al Boucher

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[diesel_mercedes] RE: Troubleshooting '82 300D Climate Controls

 

Conrad ;


If the circuit board is discolored , it's been too hot , find out why ~ maybe the relay you mentioned , maybe the auxiliary water pump ? .


The Kilma II system is O.K. , I still prefer the manual system on SWMBO's 240D .


-Nate

       Conrad Wrote :

 

The climate controls in my '82 300D haven't worked correctly since this car wandered into my life 5+ years ago.  I don't drive the car in sloppy/winter weather, so this hasn't been the biggest issue for me, but we're heading into a cold but dry fall, which is shaping up to be an excellent time to keep on chugging, so long as I can keep my hands from going numb while driving.

The monovalve seems to be working fine (I can regulate output air temperature) and I replaced the blower motor last fall because I was in a time crunch and didn't have time to fuss with changing out the brushes on the original blower.  Even then, though, I still had the standard symptoms that the climate control system will only operate in defrost mode.  The A/C is long non-functional, of course, due to an extended period of vehicular neglect prior my ownership; I'm just trying to get the economy modes to operate.

After returning from a short drive this afternoon, I pulled the climate control assembly this afternoon to inspect it for possible cracked solder joints.  A quick visual inspection doesn't show anything particularly dramatic on that front, though I'm going to re-flow all the edge connectors anyway.  However, I found that a portion of the system board was very warm to the touch, with circuit board discoloration where at least one relay is located.  Like I almost always do, except when I'm defrosting my windows, I run my car with the temperature wheel turned all the way down and the system turned off.  Shouldn't all power be cut to the climate controls in that mode? Should I actively be worried about a bad mechanical relay, or is what I'm seeing similar to the "always on" nature of the cruise control unit (at least until it fails)?

I hope to further disassemble the unit to expose both sides of the board tomorrow (ran out of time tonight).  Since this isn't the evil KLIMA I system and spares are generally available, should I start querying the list for a replacement set of controls (or boards) instead of potentially desoldering and replacing board components?

Thanks for any advice you can provide!

--Conrad J.

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[diesel_mercedes] RE: Re: Troubleshooting '82 300D Climate Controls

 

Well, a great starting point for troubleshooting the climate control block can be found here:


http://w123maintenance.blogspot.com/2007/10/automatic-climate-control-unit-repair.html


I did my homework even before I found this guide, and I knew about the cracked solder joint issue.  However, this guy did a stupidly easy to follow picture-intensive guide on how to take down the controls into their components. To re-flow the solder joints, you can just pop the bottom plate off the control block and have at it; this little guide takes you through all the details you'd miss if you just do that.


However, it doesn't say what the "normal" state of the relays should be, so I don't really have an easy test.  It is said that fixing the solder joints fixes things most of the time--at least until you start having to mess with the vacuum pods (which I also will have to do--I can hear the vacuum leak when the system is on, but that goes to vent flaps, not the ability of the fan to run.


--Conrad J. 



---In diesel_mercedes@yahoogroups.com, <diesel_mercedes@yahoogroups.com> wrote:

Keep us posted as we all have A/C issues over time and can benefit from your experience. Every year I swear I will fix mine, but the So. Cal. weather is only hot hot for a couple of months, so I forget to take care of things.

brian from laverne

--- In diesel_mercedes@yahoogroups.com, <conrad.jacoby@...> wrote:
>
> The climate controls in my '82 300D haven't worked correctly since this car wandered into my life 5+ years ago. I don't drive the car in sloppy/winter weather, so this hasn't been the biggest issue for me, but we're heading into a cold but dry fall, which is shaping up to be an excellent time to keep on chugging, so long as I can keep my hands from going numb while driving.
>
> The monovalve seems to be working fine (I can regulate output air temperature) and I replaced the blower motor last fall because I was in a time crunch and didn't have time to fuss with changing out the brushes on the original blower. Even then, though, I still had the standard symptoms that the climate control system will only operate in defrost mode. The A/C is long non-functional, of course, due to an extended period of vehicular neglect prior my ownership; I'm just trying to get the economy modes to operate.
>
> After returning from a short drive this afternoon, I pulled the climate control assembly this afternoon to inspect it for possible cracked solder joints. A quick visual inspection doesn't show anything particularly dramatic on that front, though I'm going to re-flow all the edge connectors anyway. However, I found that a portion of the system board was very warm to the touch, with circuit board discoloration where at least one relay is located. Like I almost always do, except when I'm defrosting my windows, I run my car with the temperature wheel turned all the way down and the system turned off. Shouldn't all power be cut to the climate controls in that mode? Should I actively be worried about a bad mechanical relay, or is what I'm seeing similar to the "always on" nature of the cruise control unit (at least until it fails)?
>
>
> I hope to further disassemble the unit to expose both sides of the board tomorrow (ran out of time tonight). Since this isn't the evil KLIMA I system and spares are generally available, should I start querying the list for a replacement set of controls (or boards) instead of potentially desoldering and replacing board components?
>
>
> Thanks for any advice you can provide!
>
>
> --Conrad J.
>

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[diesel_mercedes] Re: door seal

 

PS - I just saw that I posted some photo's which you can find under ?Brian's Door Seal? or something like that.

--- In diesel_mercedes@yahoogroups.com, "brian's 83 300d's" <bstromsoe@...> wrote:
>
> Max, I put on a drivers side front door seal without adhesive (maybe a dab just to hold things. The seals pretty much go in freely, but talcum powder is useful. I should have gotten an MB seal from Classic as the one I put on (from 2nd source) is a tad fat, so it is not a "perfect" fit.
>
> --- In diesel_mercedes@yahoogroups.com, <jasperezra@> wrote:
> >
> > Hey Brian, how did your seals go on? Did you use any glue? Did you just shove them in? Do they seal good? Where did you order them? max
> >
>

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[diesel_mercedes] July 13, 1999 & Jay's Garage

 

While re-exploring the Yahoo Groups page, I went back and found the first post - and thought it is still a good and useful post. It was because of watching the Jay's Garage segment on (forever) floor mats that I spent $200 for floor mats (x2 for both cars). No complaints, they will outlast me and the cars. I also re-discovered the really good search feature on this group. Type in brake or vacuum or glow plug or oil and you get 14 years of advice and pictures and venting. So once again, thanks Taran for setting up this beast that keeps on evolving.

brian from laverne

"Jay's Garage: Ask Jay As a '73 Mercedes owner, I have found some great auto advice through the "Jay's Garage" area of the Tonight Show site. I know it has been a while since Jay earned his living as a mechanic, but I think he has a team of auto pros working with him to answer visitor questions. There is also some very cool 3D technology on the site, specifically the "Virtual Jay" area of http://www.nbc.com/tonightshow/"

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[diesel_mercedes] Re: Troubleshooting '82 300D Climate Controls

 

Keep us posted as we all have A/C issues over time and can benefit from your experience. Every year I swear I will fix mine, but the So. Cal. weather is only hot hot for a couple of months, so I forget to take care of things.

brian from laverne

--- In diesel_mercedes@yahoogroups.com, <conrad.jacoby@...> wrote:
>
> The climate controls in my '82 300D haven't worked correctly since this car wandered into my life 5+ years ago. I don't drive the car in sloppy/winter weather, so this hasn't been the biggest issue for me, but we're heading into a cold but dry fall, which is shaping up to be an excellent time to keep on chugging, so long as I can keep my hands from going numb while driving.
>
> The monovalve seems to be working fine (I can regulate output air temperature) and I replaced the blower motor last fall because I was in a time crunch and didn't have time to fuss with changing out the brushes on the original blower. Even then, though, I still had the standard symptoms that the climate control system will only operate in defrost mode. The A/C is long non-functional, of course, due to an extended period of vehicular neglect prior my ownership; I'm just trying to get the economy modes to operate.
>
> After returning from a short drive this afternoon, I pulled the climate control assembly this afternoon to inspect it for possible cracked solder joints. A quick visual inspection doesn't show anything particularly dramatic on that front, though I'm going to re-flow all the edge connectors anyway. However, I found that a portion of the system board was very warm to the touch, with circuit board discoloration where at least one relay is located. Like I almost always do, except when I'm defrosting my windows, I run my car with the temperature wheel turned all the way down and the system turned off. Shouldn't all power be cut to the climate controls in that mode? Should I actively be worried about a bad mechanical relay, or is what I'm seeing similar to the "always on" nature of the cruise control unit (at least until it fails)?
>
>
> I hope to further disassemble the unit to expose both sides of the board tomorrow (ran out of time tonight). Since this isn't the evil KLIMA I system and spares are generally available, should I start querying the list for a replacement set of controls (or boards) instead of potentially desoldering and replacing board components?
>
>
> Thanks for any advice you can provide!
>
>
> --Conrad J.
>

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