Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help




Go Back   PeachParts Mercedes ShopForum > Technical Information and Support > Tech Help

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 07-06-2005, 11:49 PM
dbs600's Avatar
JD
 
Join Date: Jul 2005
Location: New York, NY
Posts: 41
1994 S500V W140 HVAC BLOWER & BLOWER REGULATOR

HELLO AGAIN:

My vehicle has the same problem that many others have previously posted about - I am able to get both hot and cold air from the vents, but no far / blower whatsoever, no matter the adjusted fan speed (MIN / AUTO / MAX).

Earlier today I attempted to determine whether my HVAC's Blower or my HVAC's Blower Regulator is the culprit - thanks to help from detailed proceedures that other boarders have provided as insight. However, I was unable to come to a conclusion...

1st. When getting to the blower and blower regulator I noticed that my filter was extremely dirty. I noticed that one person on this board quoted $100 for the part. Is this correct? - very pricey if in fact the amount!

2nd. I had planned to bypass the regulator by connecting the "blue" wire directly to the blower, but hesitated when I touched a part of the blower with a screw driver which resulted in a large spark. The vehilce was turned off at the time. Does the Blower hold a charge to it after the car it turned off!? If so how do I "decharge" it so to evade shocking myself - what precautions should I take?

3rd. After the above incident I determined that I would hold off on the diagnosis for now - but by eye balling the electric lines that run from the vehicle to the regulator back to the blower - I was confused as to how I should simply take the regulator out of circut. I do not want to cut any of the wires. Is there a plug and play way to go about this?

A/C blower's output is low . . .

I do not have a digital camera to take a picture of my regulator and blower, but as you can see from the picture embedded in the link above - All of the power lines are covered - how am I supposed to "jump" the blue from the regulator directly to the blower???

4. If the entire blower is the culprit - is this easily removed? I could not figure out how to remove the whole piece even if i wanted to - does anyone know where the screws for such are?

THANK YOU - AND GOOD NIGHT!
Reply With Quote
  #2  
Old 07-07-2005, 12:23 PM
JimF's Avatar
'94 S500: only 793 sold!
 
Join Date: Mar 2001
Location: San Diego, CA
Posts: 1,929
Just bite the bullet . .

Just replace it! It's bad.

The two torx screws you see hold it to the fan housing. The connector plugs in to the mating connector on the right.

When you put the new one in, make sure you use silicon grease between the bottom of the regulator's plate and fan housing. Simple job. .
__________________
Regards . . . . JimF
-------------------
'94 S500 Cpe

Visit my Mercedes Web Page
Reply With Quote
  #3  
Old 07-07-2005, 01:11 PM
dbs600's Avatar
JD
 
Join Date: Jul 2005
Location: New York, NY
Posts: 41
One last question then...

When I have everything exposed (filter removed) and I trun on the car and with the air conditioning system running... am I supposed to see any gears / fans moving in the blower unit - even at a minimum speed??? Because I do not.

Before ordering a regulator I wanted to verify that it was not the blower itself. But according to your recommendation I should just go a head an replace the regulator???

Thank you.
Reply With Quote
  #4  
Old 07-07-2005, 02:11 PM
JimF's Avatar
'94 S500: only 793 sold!
 
Join Date: Mar 2001
Location: San Diego, CA
Posts: 1,929
When mine went bad, I didn't check to see if the blower was turning but to be honest, it occurred a long time ago, so the details are lost.

I could feel some 'slight' air pressure coming through the vents so it HAD to be turning a little.
__________________
Regards . . . . JimF
-------------------
'94 S500 Cpe

Visit my Mercedes Web Page

Last edited by JimF; 07-08-2005 at 07:27 PM.
Reply With Quote
  #5  
Old 07-08-2005, 07:24 PM
dbs600's Avatar
JD
 
Join Date: Jul 2005
Location: New York, NY
Posts: 41
I'm going to look more into "jumping" the regulator and powering the blower directly. If it works... my order for the regulator is being placed ASAP. Thanks for your help!

Last edited by dbs600; 07-08-2005 at 07:34 PM.
Reply With Quote
  #6  
Old 07-08-2005, 11:21 PM
Registered User
 
Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,794
Quote:
Originally Posted by dbs600
I'm going to look more into "jumping" the regulator and powering the blower directly. If it works... my order for the regulator is being placed ASAP. Thanks for your help!
The blower positive terminal is always Hot, the switching is done on the ground side of the circuit..[ referred to as a switched ground]
So, by hooking a wire to the blu wire coming out of the blower and grounding it , you have completed the blower circuit without the regulator... if the blower runs, you have a reg circuit problem.. If blower does not , check for power at red terminal of blower and if yes, blower is bad..if no power at red , check feed/fuse circuit. If blower checks out yes with jumper, then you have to check that the reg has trigger voltage from the control panel . This will be 2-8 V. at yellow wire [ depending on CP settings]. If there is V at this reg trigger , you have a bad regulator. If no trigger , you have a problem at the CP
A note:
If the reg is found to be bad , I would check the blower Amp draw wired direct to assure it is within spec [ 25A.] If it is higher, that will burn out the new regulator.. Out of spec draw is usually caused by bad/binding shaft bearings or worn brushes.
It is also possible to have a bad reg caused by a plugged air filter system, as the heat-sinz dissapation requires air flow from the system to keep it in check.. so check both of these conditions before installing a new reg. or you can burn up a new one in no time

PS
I always use a jumper with an in-line 25A fuse in the jumper just in case the blower is shorted/bound , for protection of cars harness/feed.
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
White Stuff under the Blower motor regulator. Merc1 Tech Help 5 08-13-2005 05:31 PM
W140 Blower Motor Regulator woes~ MoneyPitW140 Tech Help 5 02-13-2005 02:44 PM
W140 Blower Regulator Problem bdonkersgoed Tech Help 12 06-08-2004 03:25 PM
W140 Blower Motor Speed - Bad Regulator? jgl1 Tech Help 1 04-22-2004 03:53 PM
W140 Blower Motor / Regulator Replace Together? ddrake3 Tech Help 2 03-19-2003 11:36 AM



All times are GMT -4. The time now is 03:41 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page