[W126 Coupe] MBCOUPES Digest, Vol 36, Issue 8

[Rick Granlund]

Terry-
	The #7 fuse controls a number of circuits.  All but the blower work 
normally, hence it is not the problem.  That is where I went first. Now 
the question is how to access the blower motor and the resistor assembly 
to check them out by applying +12V to them. I don't have a wiring 
diagram but it is an 89 US spec 560, with passenger airbag.  Do you have 
a procedure or write up to access the motor and which lead is the +12V?
Thanks
Rick

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> Today's Topics:

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>    1. Re: heater/AC blower motor failure ?? (Terry Ratliff)

>    2. Re: heater/AC blower motor failure ?? (Mike Ramay)

> 

> 

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

> 

> Message: 1

> Date: Wed, 5 Sep 2007 12:01:49 -0400

> From: "Terry Ratliff" <Terry at MyMBSEC.com>

> Subject: Re: [W126 Coupe] heater/AC blower motor failure ??

> To: <rickard681 at cox.net>,	"'Mercedes Coupes Mailing Lists'"

> 	<mbcoupes at mbcoupes.com>

> Message-ID: <046c01c7efd6$1362a460$660fa8c0 at DellE1705>

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

> 

> Rick - it is #7 - Pop open the cover to see it.

> 

> 

> 

>  

> 

> Best Regards,

> 

> Terry C. Ratliff

> 

> MyMBSEC.com

> 

> P.O. Box 4782, Clearwater, Florida 33758-4782

> 

> Phone: 727-489-2116

> 

> eMail: Terry at MyMBSEC.com

> 

> Web site: http://MyMBSEC.com 

> 

>  

> 

>  

> 

>  

> 

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

> From: mbcoupes-bounces at mbcoupes.com [mailto:mbcoupes-bounces at mbcoupes.com]

> On Behalf Of Rick Granlund

> Sent: Wednesday, September 05, 2007 11:37 AM

> To: Dick Spellman

> Cc: Mercedes Coupes Mailing Lists

> Subject: Re: [W126 Coupe] heater/AC blower motor failure ??

> 

>  

> 

> Hi Dick-

> 

>       Thanks for the prompt response.  I have tried to locate the 30 A. 

> 

> foil fuse but can' seem find it on my 560SEC. I have attached a scan of 

> 

> the diagram of my firewall in that area.  Could you tell me where/what 

> 

> to look for? I appreciate it.

> 

> Thanks

> 

> Rick

> 

>  

> 

> Dick Spellman wrote:

> 

>> Hi Rick:

> 

> 

>> Please check the separate 30amp foil fuse in the external holder up near 

> 

>> your brake vacuum booster first.  It's bolted just to the inside of the 

> 

>> engine firewall.

> 

> 

>> Dick

> 

>  

> 

>> Rick Granlund wrote:

> 

>>> HI-

> 

>>>   My '89 560SEC had been sitting for almost a month due to an extended 

> 

>>> business trip.  When I took the car for a much needed jaunt up the 

> 

>>> interstate I noticed that the AC didn't seem to work.  When I returned 

> 

>>> home I checked to see if the compressor was turning,,,and it was, but 

> 

>>> the fan (blower) was not blowing air...in any mode. i.e. fast, slow or 

> 

>>> automatic.  It is not a blown fuse because the blower motor is on the 

> 

>>> same circuit as other things that work properly.  When I select 

> 

>>> 'economy' the compressor turns off, so the climate control seems to 

> 

>>> work properly.  I assume it is either the blower resistor pack or the 

> 

>>> blower motor itself.

> 

>>>   On these cars, does a resistor pack failure put the blower into 

> 

>>> 'fast' as default?  Does anyone have the wiring diagrams and a 

> 

>>> troubleshooting procedure?  I think I should check the blower motor 

> 

>>> and/or the resistor pack with an outside +12 source to see if they 

> 

>>> operate but I don't know where it is or how to get to it.

> 

>>>   I would appreciate someone emailing me the procedure for getting at 

> 

>>> the blower motor and resistor pack and checking them.

> 

>>> Thanks for all your help in advance

> 

>>> Rick

> 

>>> rickard681 at cox.net

> 

>>> '88 300CE (the baby coupe), '89 560SEC

> 

>>> The MB Coupes Website!

> 

>>> W126 SEC Mailing List

> 

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

> 

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

> 

> Message: 2

> Date: Wed, 5 Sep 2007 08:47:45 -0700

> From: "Mike Ramay" <mramay at att.biz>

> Subject: Re: [W126 Coupe] heater/AC blower motor failure ??

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

> Message-ID: <20070905160648.2DFA2120391 at mailwash11.pair.com>

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

> 

> This one:

> 

> 

> 

>  

> 

> Later,

> 

> Mike R.

> 

> (702) 494-8056

> 

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

> From: mbcoupes-bounces at mbcoupes.com [mailto:mbcoupes-bounces at mbcoupes.com]

> On Behalf Of Dick Spellman

> Sent: Wednesday, September 05, 2007 6:06 AM

> To: rickard681 at cox.net; Mercedes Coupes Mailing Lists

> Subject: Re: [W126 Coupe] heater/AC blower motor failure ??

> 

>  

> 

> Hi Rick:

> 

>  

> 

> Please check the separate 30amp foil fuse in the external holder up near 

> 

> your brake vacuum booster first.  It's bolted just to the inside of the 

> 

> engine firewall.

> 

>  

> 

> Dick

> 

>  

> 

> Rick Granlund wrote:

> 

>> HI-

> 

>>   My '89 560SEC had been sitting for almost a month due to an extended

> business trip.  When I took the car for a much needed jaunt up the

> interstate I noticed that the AC didn't seem to work.  When I returned home

> I checked to see if the compressor was turning,,,and it was, but the fan

> (blower) was not blowing air...in any mode. i.e. fast, slow or automatic.

> It is not a blown fuse because the blower motor is on the same circuit as

> other things that work properly.  When I select 'economy' the compressor

> turns off, so the climate control seems to work properly.  I assume it is

> either the blower resistor pack or the blower motor itself.

> 

>>   On these cars, does a resistor pack failure put the blower into 'fast'

> as default?  Does anyone have the wiring diagrams and a troubleshooting

> procedure?  I think I should check the blower motor and/or the resistor pack

> with an outside +12 source to see if they operate but I don't know where it

> is or how to get to it.

> 

>>   I would appreciate someone emailing me the procedure for getting at the

> blower motor and resistor pack and checking them.

> 

>> Thanks for all your help in advance

> 

>> Rick

> 

>> rickard681 at cox.net

> 

>> '88 300CE (the baby coupe), '89 560SEC

> 

>> 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 36, Issue 8

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

>