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-Benz Forum > Mercedes-Benz Tech Information and Support > Diesel Discussion

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 07-21-2008, 10:39 AM
katchung's Avatar
The Love Doctor
 
Join Date: Aug 2007
Location: Northeast
Posts: 93
300cd 1982 makes a high pitched screeching noise when AC is turned on

AC stopped working and makes a noticeable high pitch noise especially on acceleration...blows warm to hot air. What should I troubleshoot first? Where is the compressor? AC was intermittant for a while...now it's hot as balls.

Thx

__________________
1982 300cd 245K miles and still goin'...
Reply With Quote
  #2  
Old 07-21-2008, 10:42 AM
Registered User
 
Join Date: Jan 2002
Posts: 18,350
Seized compressor? I think on an 82 the compressor is low on the left.
__________________
1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
Reply With Quote
  #3  
Old 07-21-2008, 11:11 AM
katchung's Avatar
The Love Doctor
 
Join Date: Aug 2007
Location: Northeast
Posts: 93
I'm a neophyte...How do I check the compressor?

It still blows air...just not cold air. Thx.
__________________
1982 300cd 245K miles and still goin'...
Reply With Quote
  #4  
Old 07-21-2008, 11:20 AM
Registered User
 
Join Date: Jan 2002
Posts: 18,350
Look at it with the engine running and see if the compressor is turning or the belt just slipping. The blowing of air is independent of whether the compressor works or not.
__________________
1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
Reply With Quote
  #5  
Old 07-21-2008, 11:20 AM
vstech's Avatar
DD MOD, HVAC,MCP,Mac,GMAC
 
Join Date: Mar 2006
Location: Mount Holly, NC
Posts: 26,471
open hood, start engine, have somebody sit in car and put on the a/c look for the noise...
if the belt spins, but the compressor does not you have a seized compressor.
to verify you are looking at the compressor, look for the metal line that goes in front of the motor and follow it to the compressor.
__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
Reply With Quote
  #6  
Old 07-21-2008, 05:07 PM
Registered User
 
Join Date: Jan 2007
Location: Richmond Virginia
Posts: 309
watch out for your eyes. when my compressor seized the belt snapped and broke a blade off the fan. wouldnt want that to happen with your face in there looking around.
__________________

1996 E300 110,000
1985 300TD 212,000
1980 300D 238,000
Reply With Quote
  #7  
Old 07-21-2008, 05:13 PM
rrgrassi's Avatar
mmmmmm Diesel...
 
Join Date: Jun 2006
Location: Royse City Tx
Posts: 5,122
Mine did that as well, thanks to the clutch/pulley bearing going out. It loosened up enough to allow the belt to slip and make the thing hot enough to boil water off.
__________________
RRGrassi


70's Southern Pacific #5608 Fairmont A-4 MOW car

06 VW Jetta TDI 133K miles-replaced the other '06 that quit after 300k miles. (did not catch the bad cam in time)

91 W124 300D Turbo replaced, Pressure W/G actuator installed. 195K

90 Dodge D250 5.9 Cummins/5 speed. 400K
Reply With Quote
  #8  
Old 07-21-2008, 05:20 PM
TylerH860's Avatar
KHAAAAAAN-gress
 
Join Date: Aug 2007
Location: Wichita, Ks
Posts: 5,187
You'll either be opening your checkbook or openeing your windows.

Sorry for your loss.
__________________
1985 500SL Euro w/ AMG bits 130k
1984 300SD Turbodiesel 192k
1980 240D Stick China 188k
2001 CLK55 AMG 101k
2007 S600 Biturbo 149k Overheated Project, IT'S ALIVE!!!
Reply With Quote
  #9  
Old 07-21-2008, 07:29 PM
katchung's Avatar
The Love Doctor
 
Join Date: Aug 2007
Location: Northeast
Posts: 93
thanks guys

Actually, it blew kind of cold air today. No screeching anymore. Looks like there is 123R, but maybe not enough? What can I do on my own to service the AC without special tools? Maybe it has a leak. The screeching was more of a high whine. I'll have my wife flip the AC switch when I get home from NYC tomorrow night...at least rule out the compressor. Anyone follow Diesel Giant's resoldering plans for climate control? Is that the wrong place to go if all switches work despite lack of chill?
thanks again.
__________________
1982 300cd 245K miles and still goin'...
Reply With Quote
  #10  
Old 07-21-2008, 08:25 PM
vstech's Avatar
DD MOD, HVAC,MCP,Mac,GMAC
 
Join Date: Mar 2006
Location: Mount Holly, NC
Posts: 26,471
this could be as simple as a loose or greasy belt.

__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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




All times are GMT -4. The time now is 07:41 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2022, 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