1995 E300 heater core hose connector? - PeachParts Mercedes-Benz Forum

Jerox · #1 01-02-2016, 07:58 PM

I was driving home from a trip home
When the low coolant light came on, I opened up the hood and noticed the tube in the first picture was loose from the 3 way connection. Is this a specific mercedes part and is there a special way to get the ridged portion of the connector onto the special fitting on the tube itself? I looked around for the connector and couldn't find it for sale on the site. 3 pictures of the y connector

sixto · #2 01-03-2016, 10:16 PM

Posting your pictures directly -

I don't know that the problem is related but Jeremy is a wealth of knowledge for 124.131 monovalves - 1995 E300D Monovalve Problem

Sixto
83 300SD

Jeremy5848 · #3 01-03-2016, 10:39 PM

I can't tell from your pictures exactly what has come apart. The Y connector splits the coolant flow from the head; it goes either through the heater core or bypasses it, depending on the position of the monovalve.

The parts are unique to the 1995 E300D and probably are available only through a dealer. You may be able to make up a replacement with plumbing fittings although I can't advise as to the wisdom of putting copper in the coolant.

Jeremy

Jerox · #4 01-06-2016, 01:17 AM

Hey. Thanks for your help. The bottom part of the y fitting has come off of the hose going back to the valve near the battery on the passenger side. I thought I could cram it back in but I think the y connector and the hose it came off of were a single unit. I'll try going to the dealership tomorrow. Hopefully it won't be too expensive for the part

Jerox · #5 01-06-2016, 06:02 PM

I'm fairly certain it's this part right here 124-830-54-15-M22 . It seems to be a part of the other W124 chassis vehicles. Or a hose just like it with the connector.

andrewjtx · #6 01-07-2016, 01:18 PM

Our site sponsor has the part in stock: Pelican Parts - Product Information: 1248305415 - 124-830-54-15-M22

Jerox · #7 01-07-2016, 02:21 PM

The hose (part #:124-830-54-15-mbz) looks just like the hose on my car. The 3 way connector came undone in the place where I've circled in red . It looks like its glued in there or something does anybody know? I tried with all my might to try to fit it back in but it didn't work so I assume it just broke internally. The part I've circled in blue seems to go to the heater valve in my car by the battery on the passenger side. This part seems like what's in my car but a couple of websites have said it's not the part and that I should get 124-832-99-93 instead. The parts guy at the dealership said that neither of those hoses is the right part. I'm wondering if any other 95 E300D owners have dealt with this issue

Jeremy5848 · #8 01-08-2016, 01:01 AM

The three-way connector in my car is just like yours but in a bad position for photography. The part you've circled in blue is the "bypass" line; the other leg of the three-way goes to the heater core. The monovalve chooses one of the two depending on whether heat is called for by the climate control system. Coolant from the head flows through one or the other.

My guess as to the reason for this "feature" is that it helps keep the head at a more constant temperature (since coolant is always flowing) and probably was added as part of smog control. You could probably eliminate the bypass line and let the monovalve just turn off the heater line. I don't think it would hurt the engine.

AFAIK, the only other car to get this version plumbing was the very-late (May 1993) 300D2.5 Turbo, because it is the only one that also uses the monovalve 001-830-40-84.

Jerox, is your monovalve cracked and/or leaking? It seems to be a common problem in the '95 E300D.

Jeremy

Jerox · #9 01-09-2016, 02:22 AM

http://i.imgur.com/gtX6i1g.jpg http://i.imgur.com/jbZnoix.jpg my monovalve valve appears to be fine. No leaks there at over 150,000 miles. So do you think I could just put a straight tube across and just block off the bypass tube? I'm new at working on this car or any automotive heating systems.

benedict · #10 01-09-2016, 03:29 AM

I have the same part. Were you working in the area for it to come apart or did it just fail?

Jerox · #11 01-09-2016, 01:39 PM

It just failed at the attachment to the bypass. Is the connector physically a part of the bypass hose or am I just bad at putting it back in? There isn't a hose clamp there.

sixto · #12 01-09-2016, 07:59 PM

Seems like you can replicate the plastic Y with a brass T and barbed fittings from a hardware store.

Sixto
83 300SD

Jeremy5848 · #13 01-09-2016, 11:36 PM

Sixto has a good idea. Nothing magic about the Y-connector. Stainless would probably be better than brass but more expensive and harder to find.

EPC is really hard to understand for this car, with multiple diagrams and parts, some of which are "valid" and some of which are grayed out. The Y-connector may be 124-830-55-15. Not enough detail to tell if the hose is part of the Y-connector or not.

Jeremy

Jerox · #14 01-12-2016, 01:39 AM

Well. I called up two more places and a scrapyard and they didn't know either. So I set up an appointment with my mechanic. Hopefully she knows which part it is. I tried thinking of a way to jury rig it with pipe fittings but couldn't find anything that might fit the lower hose properly. I'll see how it goes on Wednesday.

Jeremy5848 · #15 01-12-2016, 06:30 PM

Quote:

Originally Posted by Jerox

Well. I called up two more places and a scrapyard and they didn't know either. So I set up an appointment with my mechanic. Hopefully she knows which part it is. I tried thinking of a way to jury rig it with pipe fittings but couldn't find anything that might fit the lower hose properly. I'll see how it goes on Wednesday.

Remember that in some ways (including the present one) the '95 E300D is unique. Some of these parts are used only in this model; the Y-connector may be one of them.