MBWorld.org Forums

S-Class (W126) 1979-1991: 300 SE, 300 SEL, 380 SE, 380 SEL, 420 SEL, 500 SEL, 560 SEL, 360 SEC, 500 SEC, 580 SEC, 300 SD TURBODIESEL, 300 SDL TURBO, 350 SD TURBO, 350 SDL TURBO

High speed fan setting for HVAC not working 1990 300SE

Thread Tools
 
Search this Thread
 
Rate Thread
 
Old Nov 11, 2004 | 01:43 PM
Share
  #1  
cam69ss's Avatar
cam69ss
Thread Starter
Member
 
Joined: Jun 2003
Posts: 130
Likes: 0
From: Northeast MA
1990 300SE
High speed fan setting for HVAC not working 1990 300SE
Hello All,
I have a 1990 300SE with 236,000 miles and the high speed fan for AC and heater does not work.
I took apart the HVAC controller and re-soldered all the joints. Still not working. Any ideas of what the problem could be?
Thanks in advance
Dan
Reply
0
Old Nov 11, 2004 | 03:22 PM
Share
  #2  
Jer's Avatar
Jer
Super Member
 
Joined: Jun 2003
Posts: 595
Likes: 0
From: Middlefield, CT
1994 E320
Check the blower motor regulator, located in the fresh air stream of the heater box.
Reply
0
Old Nov 11, 2004 | 04:35 PM
Share
  #3  
cam69ss's Avatar
cam69ss
Thread Starter
Member
 
Joined: Jun 2003
Posts: 130
Likes: 0
From: Northeast MA
1990 300SE
Jer, Thanks for the reply
what is the blower motor regulator? Is it electrical or mechanical? Similar to a relay?
Anyone know how to get to it on a 126 car?

Thanks
Reply
0
Old Nov 11, 2004 | 04:50 PM
Share
  #4  
Jer's Avatar
Jer
Super Member
 
Joined: Jun 2003
Posts: 595
Likes: 0
From: Middlefield, CT
1994 E320
It is a transistorised controller for fan speed regulation. You get to it through the fresh air grille under the windshield (at least on a 124).
Reply
0
Old Nov 11, 2004 | 05:27 PM
Share
  #5  
cam69ss's Avatar
cam69ss
Thread Starter
Member
 
Joined: Jun 2003
Posts: 130
Likes: 0
From: Northeast MA
1990 300SE
So I have to take out the dash pad?
Reply
0
Old Nov 11, 2004 | 05:29 PM
Share
  #6  
Jer's Avatar
Jer
Super Member
 
Joined: Jun 2003
Posts: 595
Likes: 0
From: Middlefield, CT
1994 E320
No. The fresh air grille is outside, near the wiper transmission.
Reply
0
Old Nov 11, 2004 | 05:31 PM
Share
  #7  
cam69ss's Avatar
cam69ss
Thread Starter
Member
 
Joined: Jun 2003
Posts: 130
Likes: 0
From: Northeast MA
1990 300SE
right in front of the wiper trans. area, in the engine compartment?
Reply
0

Trending Topics

Old Nov 11, 2004 | 05:48 PM
Share
  #8  
Jer's Avatar
Jer
Super Member
 
Joined: Jun 2003
Posts: 595
Likes: 0
From: Middlefield, CT
1994 E320
Not in the engine compartment. Under the windshield. You can't miss it.
Reply
0
MB World Stories

The Best of Mercedes & AMG

story-0

6 Mercedes Models That Did NOT Age Well (But Are Somehow Still Cool)

 Verdad Gallardo
story-1

Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun

 Verdad Gallardo
story-2

Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren

 Verdad Gallardo
story-3

8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine

 Verdad Gallardo
story-4

Flawlessly Restored Mercedes 190E Evo II Heads to Auction

 Verdad Gallardo
story-5

Electric Mercedes C-Class Unveiled: 11 Things You Need to Know

 Verdad Gallardo
story-6

Mercedes EQS Gets A Major Update: Everything You Need to Know

 Verdad Gallardo
story-7

5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve

 Verdad Gallardo
story-8

Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping

 Verdad Gallardo
story-9

10 Most Reliable Mercedes-Benz Models You Can Buy Used

 Verdad Gallardo
Tags
Back to Subforum
S-Class (W126)
View Next Unread
WTB Euro headlights for 500SEC

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 


You have already rated this thread Rating: Thread Rating: 0 votes, average.
Show Printable Version
Email this Page

Advanced Search

All times are GMT -4. The time now is 03:57 AM.

story-0
6 Mercedes Models That Did NOT Age Well (But Are Somehow Still Cool)

Slideshow: Not every Mercedes design becomes timeless, some feel stuck in the era they came from.

By Verdad Gallardo | 2026-05-12 18:09:07


VIEW MORE
story-1
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun

Slideshow: Yes, Mercedes built manual cars, and some of them are far more interesting than you'd expect.

By Verdad Gallardo | 2026-05-02 12:36:58


VIEW MORE
story-2
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren

Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.

By Verdad Gallardo | 2026-04-29 11:19:28


VIEW MORE
story-3
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine

Slideshow: Before curves took over, Mercedes mastered the art of the straight line, and some of those shapes still look right today.

By Verdad Gallardo | 2026-04-25 12:05:49


VIEW MORE
story-4
Flawlessly Restored Mercedes 190E Evo II Heads to Auction

Slideshow: The 190E Evolution II shows how a homologation necessity became a six-figure collector icon.

By Verdad Gallardo | 2026-04-22 17:53:47


VIEW MORE
story-5
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know

Slideshow: Mercedes is turning one of its core nameplates electric, and the details show just how serious this shift is.

By Verdad Gallardo | 2026-04-21 13:58:06


VIEW MORE
story-6
Mercedes EQS Gets A Major Update: Everything You Need to Know

Slideshow: Faster charging, longer range, and a controversial steer-by-wire system define the latest evolution of Mercedes-Benz EQS.

By Verdad Gallardo | 2026-04-15 10:35:34


VIEW MORE
story-7
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve

Slideshow: These overlooked Mercedes-Benz models never got the spotlight, but they quietly delivered more than most remember.

By Verdad Gallardo | 2026-04-13 19:35:45


VIEW MORE
story-8
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping

Slideshow: A well-used 1991 Mercedes-Benz 300D with more than one million miles is now looking for a new owner, and it still appears ready for more.

By Verdad Gallardo | 2026-04-10 10:05:15


VIEW MORE
story-9
10 Most Reliable Mercedes-Benz Models You Can Buy Used

Slideshow: From bulletproof sedans to surprisingly tough SUVs, these Mercedes models proved that the three-pointed star can go the distance.

By Verdad Gallardo | 2026-04-08 09:55:49


VIEW MORE