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 02-05-2002, 11:42 PM
wellspsyd
Guest
 
Posts: n/a
Question How to test aux heater pump

Would like to know which of the two wires is the positive on the aux water pump for a '79 300sd. Thanks
Reply With Quote
  #2  
Old 02-06-2002, 02:14 AM
za_w124_200e
Guest
 
Posts: n/a
to test a pump, polarity is immaterial (if the direction of coolant flow is not important - which should not be for a short test). Be careful not to short out the supply leads as the contacts on the pump are very close together.

The aux pump should be running when the car is idling and the interior set to a temp that requires the heater to operate - being winter up north might make the last statement unnecessary ...

AFAIK the aux pump ensures adequate coolant (heat ?) flow through the heatre core at idle when the main pump is running slower ...

if the control unit is bust, the aux pump will not operate. A faulty aux pump will cause the control unit to pop .....

I'm not sure what the current flow should be, but it should not be more than an amp or two. put a fuse in to be safe.

L
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
Can I just bypass my 85 300D aux water pump? Its leaking... Carrameow Diesel Discussion 9 12-15-2004 07:43 PM
Aux water pump leak prb51 Tech Help 1 04-27-2004 10:04 PM
1992 400E aux water pump location? E93067 Tech Help 9 03-29-2004 10:24 PM
aux. water pump (w124) 300E24V Tech Help 3 08-29-2003 03:39 AM
Need help with fuel pump relay wireing xp190 Tech Help 0 12-30-2002 05:27 PM



All times are GMT -4. The time now is 05:23 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2011 Pelican Parts - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page