[R129 SL] Fwd: [R129 SL 500 Replace Blower Regulator

[Paul Samarin]

Wow!  Found it in my own email folder.  It was such a complete write- 
up, I saved it!  Thank you very much for taking the time to write  
this up, Jan!  I'm gonna study it and probably have some questions.

Thanks,

Paul

Begin forwarded message:


> From: "Jan Kuylaars" <J.kuylaars at kpnplanet.nl>

> Date: April 19, 2007 1:23:38 PM PDT

> To: "." <mid-co at ix.netcom.com>, "SL Mailing List"  

> <r129list at mbcoupes.com>

> Subject: Re: [R129 SL] [R129 SL 500 Replace Blower Regulator

> Reply-To: SL Mailing List <r129list at mbcoupes.com>

>

> I FIXED MINE WITH SAME PROBLEM WITH TWO DROPS OF OIL AND A SATURDAY  

> OF WORK:

>

> In the past some times I discovered that the blower motor wont not  

> operate

> ore drove at low speed.Then turning on again the switch solved the  

> problem.

> Yesterday the motor did not operate at all. Turning several time  

> the switch

> did not change anything.

> So I must repair the system. Because all the other functions on the  

> half

> automatic climate control were normal operating ,

> I could hear the air-operated valves close  when I set the blower  

> switch on

> off and open when I used forced windshield heating on 6 ,

> I now for 99% that the control box was not defective.

> Looking on the ETM ( electronic trouble manual) on the MB USA DVD I  

> could

> see that there were four other parts that could be defect.

> 1-The Fuse F19 , placed near the big fuse box , above the brake  

> vacuum box.

> 2-N29, the power control unit, placed on the blower motor.

> 3-The blower motor M2 , placed underneath the air inlet filter.

> 4- The wiring in this system, including the earth connection W1,  

> placed

> under the dashboard.

> Off course I hoped that the last was not the issue.

>

> So I started with taking away the rubber band that is positioned  

> between the

> air inlet and the motor compartment.

> Then pulling the grey cap what is positioned between the windshield  

> wiper

> and the mechanic up from the wiper system.

> Unscrew the bolt that holds the wiper arm on the system , and take  

> of the

> wiper arm by pulling it to the right.

> Unscrew the left and right air inlet box by not taking out the  

> screw, but

> only loose them some turns. |For the inner screws near the wiper

> Motor it is necessary to putt the screwdriver true the hole that is  

> covered

> by plastic taps. The hole looks like a cross.

> After unscrew pull the outside ( mirror side ) up towards the roof  

> for some

> inches. The box becomes loose from the screws.

> Then pull the right one to the right mirror side and the left to  

> the left

> mirror side. Because all the holes are on one side open,

> you can now takeoff the boxes from the chassis.

>

> Then unscrew the two bolts from the dust filter compartment ,  

> unclip the

> three clips on the motor side and pull off the complete filter  

> house cover.

> Take out the sensor on the right side , careful take out the wiring  

> and lay

> the sensor on the motor air filter.

> Unscrew all the Philips screws on the left computer compartment  

> cover plate

> and take off the cover plate.

> Carefully take out the wire from the sensor that you lay down on  

> the motor

> air filter to the computer compartment.

> The wire is positioned between the bottom from the airfilter  

> compartment and

> the chassis .

> Pull out the green and yellow air pipes out off the connectors in the

> computer compartment.

> Pull out the round cover plate underneath the rubber from the wiper

> mechanism.

> Unscrew the left wiper motor cover plate  and the right air inlet  

> cover

> plate , they are fastened with two Philips screws and two plastic  

> fasteners.

> Take off these covers.

>

> Now you can see the complete wiper system. Search for the wiper  

> computer

> positioned to the windshield side in the computer compartment.

> On top of the computer there is a smaller relay box. on these relay  

> box

> there is the wiper motor connector. You can see it on the colours  

> and the

> thickness

>> From the wires : on the right side it is green-white-black-yellow  

>> and brown.

> The same like on the wiper motor. You also can follow the cable  

> from the

> wiper motor

> To the relay box. Push the holder from the connector to the left so  

> the

> connector come off the relay box.

>

> Now unscrew the two bolts which clamped this cable on the wiper motor.

> Unsolder or un well the wires on the wiper motor. Started with the  

> green

> from the motor

> And the cable, then the red from the motor and white from the  

> cable, then

> the black-yellow and brown. On the brown there is also an small  

> brown wire

> to the shell for earth

> Pull the cable out off the compartment to the computer compartment.  

> Be aware

> not to damage the rubber seal so you can later putt it back perfectly

> watertight.

> Unscrew the under rubber holder from the wiper mechanism with a  

> small 90

> degrees wrench set.  Unscrew the rest from the mechanism with a 10  

> mm pipe

> tool set.

> Take out the wiper mechanism to pull it to wards the motor  

> compartment.

>

> Unscrew the left rubber mounting  from the wiper mechanism with a  

> 22 mm

> wrench set. Unscrew the other bolts with a 10 mm pipe tool out of  

> the bottom

> of the

> Air filter compartment. Then use a 10 mm pipe tool that is at least  

> 20cm

> long and putt some chewing gum or other adhesive compound at the end.

> That is that the bolts are not falling into the chassis but stay in  

> the tool

> to take them out of the car.

> There are three bolts positioned in the bottom from the air filter

> compartment between the iron chassis from the motor compartment  

> and  the

> plastic side wall

>> From the air filter compartment. So you have only a half inch to  

>> do so. Also

> the four other cables laying in this space can be a problem.

> You can solve this problem by using a big flat screwdriver and pull  

> one

> cable to the air filter compartment, so you can use the pipe tool  

> between

> the cables.

> ( when you assemble you have no problem because then you have  the

> possibility and space to lay all the cable's neat above each other  

> to the

> iron side  )

> Now pull out the complete air filter bottom out of the car.

>

> Now you can see the blower motor. Take off the green air pipe from  

> the motor

> . Take of the red and green wires from the motor.

> Unclip the four clips on the right side from the vent cover, and  

> two clips

> from the left vent cover. Unclip the steel band what is holding the  

> blower

> motor on its place.

> Now you can take of the motor complete with vents.

>

> I tried to let the motor turn by hand, but it was very difficult. The

> bearings were completely dried out. Checking the cowl browsers ;  

> they were

> OK.

> Putting some oil on the bearings , and turning the motor by hand ,  

> loose the

> bearings . Using an extern power supply from 12 volts 5 Amps let  

> the motor

> Turning faster and faster , and after some time and repeating the  

> oil , the

> motor turns like new.

>

> So after assembling the complete system in reverse order like  

> mentioned

> above, I repaired my car with five drips of oil and four ours of   

> my own

> labour.

> Dissembling take 3 hours and assembling only one hour. That's  

> because I then

> new how to work. That's why I write it down for those people who  

> must do the

> same job.

> At the same time I oiled the wiper system, let come out the arm by  

> turning

> the motor.

>

>

> Friendly greetings from The Flying Dutchmen 500 SL

>

>

>

> Jan Kuylaars Westerhoven

>

> -----Oorspronkelijk bericht-----

> Van: r129list-bounces at mbcoupes.com

> [mailto:r129list-bounces at mbcoupes.com]Namens .

> Verzonden: donderdag 19 april 2007 22:08

> Aan: SL Mailing List

> Onderwerp: Re: [R129 SL] [R129 SL 500 Replace Blower Regulator

>

> Thanks for the blower regulator info.

>

> Is this a procedure that a "weekend mechanic" can

> do ?  Can you describe the procedure ?

>

> Thanks in advance for your thoughts .

>

> Bruce in Nashville - 1995 SL 500

> The MB Coupes Website!

> R129 SL Mailing List

>

> The MB Coupes Website!

> R129 SL Mailing List


Paul Samarin
pauls at sbcglobal.net



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