Jammed Heater Cables

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Dernburg Wagon
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Joined: Sat 27 Aug, 2016 7:28 am
Model you own: w114

Jammed Heater Cables

Post by LOW114 » Tue 11 Oct, 2016 6:14 pm


Is there any DIY repair articles on jammed Heater cables? The Cooling controls work perfectly, just the heater is jammed.

I have heard sometimes it can be an easy fix but other times it can be painful, I'm hoping mines on the simple side [emoji16]

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Joined: Mon 24 Mar, 2014 7:32 pm
Model you own: w114
Location: Adelaide

Re: Jammed Heater Cables

Post by oldmercfan » Tue 11 Oct, 2016 10:20 pm

Hi, if your problem is the same as mine, it's not the cables that are jammed but the heater control valve attached to the bulkhead. These are made of brass and they corrode and jam up. The seals also wear out. The valve is easy to pull apart and clean up with a bit of fine sandpaper, and you can buy heater value kits very cheaply from the forum sponsor. I did this and the heater was wring perfectly, although a year later it is jamming up again. Maybe someone else can chip in here. Should I have out some grease in there when I replaced the seals?
1972 W114 280E (Tiefblau)
1986 W201 190E (White)

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300 SLR
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Location: Perth WA

Re: Jammed Heater Cables

Post by Bartman4800 » Wed 12 Oct, 2016 10:56 am

It's always good to put some O-ring grease (silicone grease, not vaseline) on when installing seals like that...

I bought a tube at the local O-ring shop (Transseals), but CBC, statewide bearings etc. should have it too.

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