76" W114 water leak from heater - Mercedes-Benz Forum

 
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post #1 of 5 (permalink) Old 08-28-2011, 12:19 AM Thread Starter
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76" W114 water leak from heater

Hi everybody.
My W114 has just started leaking water. I have traced the leak to the valve where the water is circulated through the heating system. This valve is located on the firewall. Has anyone had any experience taking these apart?
Thanks
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post #2 of 5 (permalink) Old 08-28-2011, 01:56 PM
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Yup. They are a PITA but do-able. Plan on stretching it out over a couple of days. It can be done in one but it isn't any fun.

Pull the front seats, front carpets,center console and lower console just for adequate room. It can be done without pulling the seats but there are only four bolts holding each seat.

You'll need to remove the heater box and air diffuser. Get yourself a good set of snap ring pliers and a supply of band aids.

This is a good time for you to renew the seals, gaskets and silencer pads in the heater box venting. An EXTREMELY good time to check out the defrost fan also. Clean it, give it a good lube using some high temp grease in the bushing or replace it all together.

Take your time, walk away when you get frustrated and don't force anything. You might have to disconnect the evaporator but you could get lucky and it'll swing out of the way.

Don't be surprised if all the seams don't fit back together exactly. You are undoing 30+ years of heat cycling and tensions. Get some "real" duct tape and be prepared to seal the box with it. Do NOT use a RTV or any type of silicone sealer in the joints. You just might need to take it back apart some day.
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post #3 of 5 (permalink) Old 08-29-2011, 04:35 AM Thread Starter
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Hi there. I'm wondering if I have described the wrong part. It is a small horizontal cylinder which is bolted onto the firewall. It has three pipes (water) leading to it. It has levers at each end which are moved via cables which are connected to inside the cabin and control the left and right heater. At one end is where the leak is located, water is dripping out by the lever. Hope this makes sense! Thanks
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post #4 of 5 (permalink) Old 08-29-2011, 05:38 AM
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Ahhh! The control valve. Piece of cake! Drain a bit of the coolant, undo the hoses, slip the cables off, two small bolts (either 8mm or 10 mm heads) and pull the entire assembly.

There's a snap ring on each end which needs to be removed. The valves slip out of the body of the unit. Make a note of the positions of the cable levers and the slots in the valve body. Give it a good cleaning, a light lube with some petroleum jelly, renew the o-rings and re-assemble.

When you re-fill with coolant, leave the center hose disconnected at the valve body. Allow the air to bleed out before re-attaching.
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post #5 of 5 (permalink) Old 08-29-2011, 07:58 PM Thread Starter
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All done!, very easy fix after the help from this forum. Thanks Mikey D!
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