Question about 1995 Mercedes-Benz S-Class

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I have a 96 320 SL with a badly leaking frost plug at the rear of the head right up against the firewall. Instead of taking the head off and exposing myself to the can of worms in the valve gear, i thought i would take the engine out and repair the frost plug. Can you tell me if in uncoupling the exhaust/inlet side/radiator hoses etc there are any hidden traps for the unwary?

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If Mercedes is new to you on the repair side, try locating an additive called "Liquid Glass" and follow the instructions on the bottle. This stuff is in fact a permanant repair and can save you a lot of money and time. If this does not work for some reason, let me know.

Posted on May 18, 2011

Testimonial: "I have tried a product called Radweld and initially it worked fine but eventually the leak resurfaced . I re-tried it but the leak is too large now."

  • Kori Policy
    Kori Policy May 18, 2011

    That's where this stuff really comes into play. I recomend this to all problem leaks and have used this stuff myself on stuff I was really skeptical on.


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Leaking water on 4.6 2000 deville on right side against firewall possible causes

Is it antifreeze or just water? If water, your AC system will frost up under use, which will melt and pool under the car on the passenger side (normal) after the engine stops. If antifreeze, there is a complicated cooling hose system, with some of them near the firewall. Check the overflow tank to see if you are losing coolant, and if so, check the hoses there while the engine is running.

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How do i replace a broken freeze plug on a 92 dodge dakota 3.9 liter v6 engine?

You need to discover where the leak is coming from first. I have seen engines frozen solid where the core plugs remained intact but instead it pushed the water pump and bent the housing. Being right at the front of the engine and most exposed to the elements I suppose it took the worst of the conditions.

Old British engines used saucer or penny core plugs and they dropped out very easily at the first sign of frost but the dish type in common use now need a lot of force to shift them especially if they are fitted with a hard sealing compound.
It isn't often a core plug will pop out where it is easy to reach because those that are easy to reach are generally the smaller ones and with bigger holes to expand into the ice tends to choose the water pump or the bigger plugs at the back of the block and sometimes cylinder head.
It becomes a different sort of a job when the leak is hard against the bulkhead or behind the flywheel.

I suggest you discover which one and then come back again. Your question could then be about removing the engine or the transmission, though I hope you will be lucky and if it is one you can reach I hope you will realise just how lucky you have been.

Good luck!

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Bad spark plug ignition coil's do that too. Cheaper. $50. #2 cylinder is the middle one on the rear bank which is closest to the firewall. You'll need to take off the top intake to get to it.

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Leaking antifreeze

freeze plugs pressed out by coolent not suffencient to stop freezing at your local temp. Reinstall freeze plug and look for more that may have been forcedout. common locations are sides of engine, and there are some in the very rear against the firewall.. head or engine removal neccessary.

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.water pores onto the ground under car 1994 sl 2

you know its not the radiator or you would have said so.the other things it could be is the water pump is leaking badly,you have a frost plug rotted out or missing,a coolant hose is split,a very bad head gasket,you will have to get under the car to see were the leak is coming from or there will be a water(coolant)stain you can follow to the leak.

Apr 19, 2011 | 1994 Saturn Sl

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Small steady water leak from the left rear side of the 1600CC engine, and this was after a new 'Head' was installed because of a broken 'timing belt'. Car is a 2000 Daewoo Lanos Coupe. All the hoses...

Might possibly be a leaking heater core or a freeze plug on the side of the engine. A small leak might be patched up with some radiator sealer but I would show the leak to the mechanic who repaired the cylinder head first. Hopefully he missed something minor and solve your problem with ease.

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Water leak up on top of the motor back next to the firewall

Sounds like a head gasket if your rad is going low as well. Not a frost plug unless it leaked alot. Hope this helps.

Aug 11, 2010 | 1998 Cadillac Catera

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Coolant is leaking from left and right side of engine.

This would either be from the head gasket if the leak is on top. If it is coming from bottom, it could be leaking from your heater core. If it is leaking from the engine block, it may be bad frost plugs.

Jul 01, 2009 | 1999 Volkswagen Jetta

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Frost plug locations for 1991 gmc 3500hd

i think you mean freeze plugs, any way there will be three on each side of engine block below exhaust manafolds. to get to the one on the right side clear to the rear of engine, the starter will have to be removed. if its the one in the middle, motor will have to be jacked up and motor mount will have to be removed to get to it. also there are freeze plugs on back of engine block, behind flywheel if one or both of them are leaking trans. will have to come out to replace them. also chk. the rear of intake were intake, and head, and block come together, same in the front could be leaking there also. as far as your truck not wanting to start i will need a little more info to help with that, like is it gas or diesel? if its gas does it have spark? can you hear fuel pump run and relay click? i will try to help the best i can but i need the info.

Jan 27, 2009 | GMC Sierra 3500HD Cars & Trucks

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