W126 electric water circulation pump? - PeachParts Mercedes-Benz Forum

LandYaghtLover · #1 02-20-2012, 08:44 PM

I thought I read the diesels have these recirculation pumps, but a gaser? I ask because the other day I shut the car off but left the heat going. The heat stayed strong for a VERY long time. Much longer than any car I have ever had. My other cars would blow heat for a little while then you would notice it drop quick. If you fired up the car for just a second warm fluid would move back into the core and you would have heat for a little while again. Not the 560, heat was great for a long time.

Just curious.

compu_85 · #2 02-20-2012, 08:46 PM

They all have it, it keeps the coolant flow through the monovalve even

-J

LandYaghtLover · #3 02-20-2012, 08:50 PM

Thanks. Good to know and explains the persistent heat. I like it!

JamesDean · #4 02-21-2012, 05:27 AM

A word of caution: When the aux pump goes bad it will likely take the climate control unit (push button unit) out when it does. There's a popular mod to install a 1 amp (I believe) in-line fuse to protect against this. Just an FYI. A member on here sells a nice little pre-made harness.

http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/242553-1-amp-fuse-link-w123-auxiliary-water-pump-%96-plug-play.html.

I just came across this!!
I lost it all....electrical fire high up in the dash

I think I'm going to fuse all my cars now.

compu_85 · #5 02-21-2012, 08:29 AM

This shouldn't happen on the GenII cars, the climate control computer can sense the overdraw and shuts down the system. But extra protection never hurts

-J

JamesDean · #6 02-21-2012, 03:27 PM

Quote:

Originally Posted by compu_85

This shouldn't happen on the GenII cars, the climate control computer can sense the overdraw and shuts down the system. But extra protection never hurts

-J

I was wondering this. I recall seeing something about second gen cars having a protection built in. I've still got two first gen cars though. I'd imagine my 201 has a protection as well though.

Fuses and such are cheap though so might as well.

gschira · #7 02-21-2012, 08:54 PM

Could someone explain to me where the aux. pump is on the 1988 300 SE? Thanks.....

JamesDean · #8 02-21-2012, 09:10 PM

Right of the battery you'll see the monovalve. The pump is to the right and a bit down from that I think. That's where it is on my 300sd. I think all 126s are the same. I think the 2 prong connector on the left side of the monovalve is the plug for the aux pump. But I'm not 100%