[W126 Coupe] MBCOUPES Digest, Vol 89, Issue 15

[Michael Ramay]

That valve is indeed doable without removing the dash but it is a PITA.
Those fittings are normally in there VERY tight. Crowsfoot will work, a
"flare" crowsfoot is better. You *might* get an open end wrench on one or
two of the fittings. Don't forget to lube the o-ring when you reassemble
this thing since you **really** don't want to go under there again!!
Mike

On Tue, Oct 18, 2011 at 5:51 AM, mavris2 at gmail.com <mavris2 at gmail.com>wrote:


> If the thermal expansion valve (txv)  the dash does not have to come out.

>  It's located above the gas pedal.  It's not fun to get out.  You'll need

> crows foot wrenches and or line wrenches.  Been a while that I have done

> one.

>

> Jason

>

>

> L&D gardner <cruftsk9 at tpg.com.au> wrote:

>

> >Hi Folks

> >

> >Many thanks for the information,it looks like the dash may have to come

> out

> >as I put the car in for an A/C regass today and they said the TX valve was

> >blocked,it cost me $110 to find that out,thought I had covered most bases

> >IE: rebuilt the compressor,new dryer,switch,hoses & 'o' rings,that will

> >teach me to get all excited about the prospect of icy cold air!!.

> >

> >I have seen one for sale on EBay from the US part number 126 830 0384 has

> >star logo for $49.99.Mine has a Nippondenso Compressor so I am not sure if

> >this is different to US spec models.I know there are a lot of Chinese

>  ones

> >in the marketplace but quality could be an issue.

> >

> >

> Kind

> >Regards Dan Gardner 1986 560 SEC Euro 220kw

> >

> >-----Original Message-----

> >From: mbcoupes-request at mbcoupes.com

> >Sent: Saturday, October 15, 2011 12:15 AM

> >To: mbcoupes at mbcoupes.com

> >Subject: MBCOUPES Digest, Vol 89, Issue 15

> >

> >Send MBCOUPES mailing list submissions to

> >mbcoupes at mbcoupes.com

> >

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> >http://www.pairlist.net/mailman/listinfo/mbcoupes

> >or, via email, send a message with subject or body 'help' to

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> >

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> >

> >When replying, please edit your Subject line so it is more specific

> >than "Re: Contents of MBCOUPES digest..."

> >

> >

> >Today's Topics:

> >

> >   1. Re: Vacuum Tube Coding (Dick Spellman)

> >   2. Re: Vacuum Tube Coding (Yousef)

> >   3. Re: Vacuum Tube Coding (Gary)

> >

> >

> >----------------------------------------------------------------------

> >

> >Message: 1

> >Date: Thu, 13 Oct 2011 13:13:05 -0400

> >From: Dick Spellman <dick.spellman at gmail.com>

> >Subject: Re: [W126 Coupe] Vacuum Tube Coding

> >To: mbcoupes at mbcoupes.com

> >Message-ID: <4E971C21.4030405 at gmail.com>

> >Content-Type: text/plain; charset=ISO-8859-1; format=flowed

> >

> >Hi Dan,

> >

> >I do not know of the color coding for the tubes but, have had to

> >troubleshoot and replace a few of the vacuum circuits in the past.

> >Basically you have the 3 or 4 vacuum take-off points on the motor.

> >

> >Something like,

> >1.  The large brake booster line.

> >2.  The line to the emssions controls like egr, purge canister and air

> >pump if any apply on the euro in your country

> >3.  The smaller line to the firewall valve and one-way valve and splitter

> >4.  The line to the vacuum modulator on the transmission.

> >

> >It's the line at the firewall (#3 above) that you are concerned with.

> >This should feed the vacuum resevoir in the fender and from there you

> >have distribution to the various systems under the dash   Like the hvac

> >distribution switching valve, the euro elevation lighting control in the

> >dash and the seat locking solenoid.  You need to pull the IC and knee

> >bolster to determine which color line is entering the cabin behind the

> >IC and from there you will see their individual routing to the

> >systems/devices.  You should be able to locate the seat solenoid valve

> >which will have electrical and vacuum connections down in and near the

> >steering column.  As I recall it gets hot so it is on the column clear

> >of any material other than steel..  Again, it is controlled by either

> >door pin switch which when door is closed, engine on; activates the

> >valve so the vacuum to seat-back lock is positive.   When any door is

> >opened or you depress the bleeder valve on the side of the seat,  the

> >seat back locks are automatically released.

> >

> >I'd guess you need to check the state change on the appropriate door pin

> >switches to be sure the solenoid is being activated electrically then

> >move on to a probable vacuum leak from the firewall to the solenoid or

> >solenoid vac line to the seats.  Perhaps start with a check for voltage

> >at the solenoid connector with engine on, doors closed, if voltage

> >present, the solenoid is working. (as in open-allowing vacuum from

> >engine to flow past the solenoid plunger and to the seat back locks.)

> >Then check the vac line-in  to the solenoid for the presence of vac with

> >engine on, if none, replace the line through the dash to the firewall

> >valve and.or check the one-way valve at the firewall for damage.  If vac

> >is present, solenoid is working (open) then vacuum should be pulling at

> >the seat junction under each seat and seat locks should be active.  If

> >not, then replace the outbound solenoid vac line to the seat junctions

> >which runs in the under carpet plastic raceway along the floor by the

> >door sills and comes up from the carpet under each seat.  Last, each pin

> >switch can be checked with an ohm meter once isolated from the

> >electrical ground circuit wiring.

> >

> >Good luck,

> >

> >Dick

> >

> >On 10/12/2011 11:52 PM, L&D gardner wrote:

> >> Hi Folks

> >>

> >> Does anyone know of a circuit diagram for the colour coded vacuum

> >> tubes,I am measuring 60kpa from the ivory tube from behind the engine

> >> to the bulkhead junction ,and the seats will lock @ 15kpa with a

> >> Mityvac at the same location on the bulkhead but the seats will still

> >> not lock as I seem to be getting losses from the dark red and yellow

> >> striped tube.Thanks

> >>

> >>

> >>

> >>                                                     Kind Regards Dan

> >> Gardner 1986 560 SEC (Euro 220kw)

> >> The MB Coupes Website!

> >> W126 SEC Mailing List

> >> Postings remain property of MB Coupes, L.L.C.

> >

> >

> >--

> >The information contained in this e-mail and the attachments, if any, is

> >legally privileged and CONFIDENTIAL.  It is intended solely for the use

> >of the individual or entity to whom it is addressed and others

> >authorized to receive it.  If you are not the intended recipient you are

> >hereby notified that any disclosure, copying, distribution, or taking

> >action in reliance of the contents of this information is strictly

> >prohibited and may be unlawful

> >

> >

> >------------------------------

> >

> >Message: 2

> >Date: Fri, 14 Oct 2011 00:09:19 +0400

> >From: Yousef <usef4188 at gmail.com>

> >Subject: Re: [W126 Coupe] Vacuum Tube Coding

> >To: Mercedes Coupes Mailing Lists <mbcoupes at mbcoupes.com>

> >Message-ID: <C8819E01-7314-4496-BBBD-D02183886C3F at gmail.com>

> >Content-Type: text/plain; charset=us-ascii

> >

> >Hey Dan

> >

> >If you want pictures of the vacuum lines for the interior i can take a few

> >.. My dash and most of the interior is out..

> >

> >Hope that helps

> >

> >Yousef

> >

> >Sent from my iPhone

> >

> >On Oct 13, 2011, at 9:13 PM, Dick Spellman <dick.spellman at gmail.com>

> wrote:

> >

> >> Hi Dan,

> >>

> >> I do not know of the color coding for the tubes but, have had to

> >> troubleshoot and replace a few of the vacuum circuits in the past.

> >> Basically you have the 3 or 4 vacuum take-off points on the motor.

> >>

> >> Something like,

> >> 1.  The large brake booster line.

> >> 2.  The line to the emssions controls like egr, purge canister and air

> >> pump if any apply on the euro in your country

> >> 3.  The smaller line to the firewall valve and one-way valve and

> splitter

> >> 4.  The line to the vacuum modulator on the transmission.

> >>

> >> It's the line at the firewall (#3 above) that you are concerned with.

> >> This should feed the vacuum resevoir in the fender and from there you

> have

> >> distribution to the various systems under the dash   Like the hvac

> >> distribution switching valve, the euro elevation lighting control in the

> >> dash and the seat locking solenoid.  You need to pull the IC and knee

> >> bolster to determine which color line is entering the cabin behind the

> IC

> >> and from there you will see their individual routing to the

> >> systems/devices.  You should be able to locate the seat solenoid valve

> >> which will have electrical and vacuum connections down in and near the

> >> steering column.  As I recall it gets hot so it is on the column clear

> of

> >> any material other than steel..  Again, it is controlled by either door

> >> pin switch which when door is closed, engine on; activates the valve so

> >> the vacuum to seat-back lock is positive.   When any door is opened or

> you

> >> depress the bleeder valve on the side of the seat,  the seat ba

> >ck locks are automatically released.

> >>

> >> I'd guess you need to check the state change on the appropriate door pin

> >> switches to be sure the solenoid is being activated electrically then

> move

> >> on to a probable vacuum leak from the firewall to the solenoid or

> solenoid

> >> vac line to the seats.  Perhaps start with a check for voltage at the

> >> solenoid connector with engine on, doors closed, if voltage present, the

> >> solenoid is working. (as in open-allowing vacuum from engine to flow

> past

> >> the solenoid plunger and to the seat back locks.)  Then check the vac

> >> line-in  to the solenoid for the presence of vac with engine on, if

> none,

> >> replace the line through the dash to the firewall valve and.or check the

> >> one-way valve at the firewall for damage.  If vac is present, solenoid

> is

> >> working (open) then vacuum should be pulling at the seat junction under

> >> each seat and seat locks should be active.  If not, then replace the

> >> outbound solenoid vac line to the seat junctions which runs in the under

> >> carpet plastic raceway along the floor by t

> >he door sills and comes up from the carpet under each seat.  Last, each

> pin

> >switch can be checked with an ohm meter once isolated from the electrical

> >ground circuit wiring.

> >>

> >> Good luck,

> >>

> >> Dick

> >>

> >> On 10/12/2011 11:52 PM, L&D gardner wrote:

> >>> Hi Folks

> >>>

> >>> Does anyone know of a circuit diagram for the colour coded vacuum

> tubes,I

> >>> am measuring 60kpa from the ivory tube from behind the engine to the

> >>> bulkhead junction ,and the seats will lock @ 15kpa with a Mityvac at

> the

> >>> same location on the bulkhead but the seats will still not lock as I

> seem

> >>> to be getting losses from the dark red and yellow striped tube.Thanks

> >>>

> >>>

> >>>

> >>> Kind Regards Dan Gardner 1986 560 SEC (Euro 220kw)

> >>> The MB Coupes Website!

> >>> W126 SEC Mailing List

> >>> Postings remain property of MB Coupes, L.L.C.

> >>

> >>

> >> --

> >> The information contained in this e-mail and the attachments, if any, is

> >> legally privileged and CONFIDENTIAL.  It is intended solely for the use

> of

> >> the individual or entity to whom it is addressed and others authorized

> to

> >> receive it.  If you are not the intended recipient you are hereby

> notified

> >> that any disclosure, copying, distribution, or taking action in reliance

> >> of the contents of this information is strictly prohibited and may be

> >> unlawful

> >> The MB Coupes Website!

> >> W126 SEC Mailing List

> >> Postings remain property of MB Coupes, L.L.C.

> >

> >

> >------------------------------

> >

> >Message: 3

> >Date: Thu, 13 Oct 2011 17:21:43 -0700 (PDT)

> >From: Gary <garysalas at yahoo.com>

> >Subject: Re: [W126 Coupe] Vacuum Tube Coding

> >To: Mercedes Coupes Mailing Lists <mbcoupes at mbcoupes.com>

> >Message-ID:

> ><1318551703.98757.YahooMailNeo at web113602.mail.gq1.yahoo.com>

> >Content-Type: text/plain; charset="iso-8859-1"

> >

> >i would like to see those pictures.?

> >

> >

> >

> >________________________________

> >From: Yousef <usef4188 at gmail.com>

> >To: Mercedes Coupes Mailing Lists <mbcoupes at mbcoupes.com>

> >Sent: Thursday, October 13, 2011 1:09 PM

> >Subject: Re: [W126 Coupe] Vacuum Tube Coding

> >

> >Hey Dan

> >

> >If you want pictures of the vacuum lines for the interior i can take a few

> >.. My dash and most of the interior is out..

> >

> >Hope that helps

> >

> >Yousef

> >

> >Sent from my iPhone

> >

> >On Oct 13, 2011, at 9:13 PM, Dick Spellman <dick.spellman at gmail.com>

> wrote:

> >

> >> Hi Dan,

> >>

> >> I do not know of the color coding for the tubes but, have had to

> >> troubleshoot and replace a few of the vacuum circuits in the past.?

> >> Basically you have the 3 or 4 vacuum take-off points on the motor.

> >>

> >> Something like,

> >> 1.? The large brake booster line.

> >> 2.? The line to the emssions controls like egr, purge canister and air

> >> pump if any apply on the euro in your country

> >> 3.? The smaller line to the firewall valve and one-way valve and

> splitter

> >> 4.? The line to the vacuum modulator on the transmission.

> >>

> >> It's the line at the firewall (#3 above) that you are concerned with.?

> >> This should feed the vacuum resevoir in the fender and from there you

> have

> >> distribution to the various systems under the dash?  Like the hvac

> >> distribution switching valve, the euro elevation lighting control in the

> >> dash and the seat locking solenoid.? You need to pull the IC and knee

> >> bolster to determine which color line is entering the cabin behind the

> IC

> >> and from there you will see their individual routing to the

> >> systems/devices.? You should be able to locate the seat solenoid valve

> >> which will have electrical and vacuum connections down in and near the

> >> steering column.? As I recall it gets hot so it is on the column clear

> of

> >> any material other than steel..? Again, it is controlled by either door

> >> pin switch which when door is closed, engine on; activates the valve so

> >> the vacuum to seat-back lock is positive.?  When any door is opened or

> you

> >> depress the bleeder valve on the

> >side of the seat,? the seat ba

> >ck locks are automatically released.

> >>

> >> I'd guess you need to check the state change on the appropriate door pin

> >> switches to be sure the solenoid is being activated electrically then

> move

> >> on to a probable vacuum leak from the firewall to the solenoid or

> solenoid

> >> vac line to the seats.? Perhaps start with a check for voltage at the

> >> solenoid connector with engine on, doors closed, if voltage present, the

> >> solenoid is working. (as in open-allowing vacuum from engine to flow

> past

> >> the solenoid plunger and to the seat back locks.)? Then check the vac

> >> line-in? to the solenoid for the presence of vac with engine on, if

> none,

> >> replace the line through the dash to the firewall valve and.or check the

> >> one-way valve at the firewall for damage.? If vac is present, solenoid

> is

> >> working (open) then vacuum should be pulling at the seat junction under

> >> each seat and seat locks should be active.? If not, then replace the

> >> outbound solenoid vac line to the seat junctions which runs in the under

> >> carpet plastic

> >raceway along the floor by t

> >he door sills and comes up from the carpet under each seat.? Last, each

> pin

> >switch can be checked with an ohm meter once isolated from the electrical

> >ground circuit wiring.

> >>

> >> Good luck,

> >>

> >> Dick

> >>

> >> On 10/12/2011 11:52 PM, L&D gardner wrote:

> >>> Hi Folks

> >>>

> >>> Does anyone know of a circuit diagram for the colour coded vacuum

> tubes,I

> >>> am measuring 60kpa from the ivory tube from behind the engine to the

> >>> bulkhead junction ,and the seats will lock @ 15kpa with a Mityvac at

> the

> >>> same location on the bulkhead but the seats will still not lock as I

> seem

> >>> to be getting losses from the dark red and yellow striped tube.Thanks

> >>>

> >>>

> >>>? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?

> ?

> >>>? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? Kind Regards Dan

> >>>Gardner 1986 560 SEC (Euro 220kw)

> >>> The MB Coupes Website!

> >>> W126 SEC Mailing List

> >>> Postings remain property of MB Coupes, L.L.C.

> >>

> >>

> >> --

> >> The information contained in this e-mail and the attachments, if any, is

> >> legally privileged and CONFIDENTIAL.? It is intended solely for the use

> of

> >> the individual or entity to whom it is addressed and others authorized

> to

> >> receive it.? If you are not the intended recipient you are hereby

> notified

> >> that any disclosure, copying, distribution, or taking action in reliance

> >> of the contents of this information is strictly prohibited and may be

> >> unlawful

> >> The MB Coupes Website!

> >> W126 SEC Mailing List

> >> Postings remain property of MB Coupes, L.L.C.

> >The MB Coupes Website!

> >W126 SEC Mailing List

> >Postings remain property of MB Coupes, L.L.C.

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> >------------------------------

> >

> >The MB Coupes Website!

> >W126 SEC Coupes

> >Postings remain property of MB Coupes, L.L.C.

> >

> >End of MBCOUPES Digest, Vol 89, Issue 15

> >****************************************

> >

> >The MB Coupes Website!

> >W126 SEC Mailing List

> >Postings remain property of MB Coupes, L.L.C.

> The MB Coupes Website!

> W126 SEC Mailing List

> Postings remain property of MB Coupes, L.L.C.

>

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