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Discussion Starter #1
I live in the UK so drive a right hand 1996 C200 Elegance (don't know if this is a UK or USA based forum)
I recently had the head gasket replaced. Yesterday, after returning from a trip, I noticed water dripping under the car. The position was roughly to the rear of the engine and slightly to the left when looking from the front.
I've been told that this almost certainly the air-conditioning overflow but I haven't been able to clarify exactly where that is situated so can't be sure the water is collecting in the right place.
My concern is that it was a similar pool of water under the car that first alerted me to the head gasket problem.
The dealer that carried out the repair assures me that everything is OK and not to worry, but!
I was told to run the car for a time and see if the header tank loses a significant amount of water, although as the gasket was only replaced a couple of weeks I was told there may be some air in the system so some topping could be needed and wouldn't be unusual.
I was also told to collect the water and taste it to see if it has anti-freeze, which I'm told would have a sweet taste. Don't much relish that idea so wondered if there was any other way to determine if the water contained anti-freeze or not.

Can uou help please?

Thanks
 

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Welcome to the forum. We are based in the United States.

Anti-freeze has usually has a greenish yellowish color. It also has a distinctive odor. If you suspect that it is anti-freeze, keep your pets away from it. Since it is sweet animals, especially dogs, will lap it up, and it is poisonous. A small taste of a drop on your finger won't hurt you.
 

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Discussion Starter #3
Hi, thanks for the welcome.

I know that anti-freeze is coloured and turns a greenish colour when added to water but couln't see last night if the water was clear or not.

I put a clear container under the car last night so that I can check it out. The drops seemed to be slowing down after a couple of hours which I'm hoping means it is the air-conditioner.

What I was hoping to know is where the air-conditioner drain/overflow pipe is situated so that I can relate that to where the water is standing.

The dealer who did the head gasket is a MB specialist but not main dealer and he wasn't too sure where the C Class overflow is located.

Also, a friend who is a mechanic said that most air-conditioner units do drain roughly in line with where the foot pedals are so he also thought that the AC was the most likely cause and I shouldn't panic!

He said I would't be the first person to think they had a water leak when it was the air-conditioner.

Hope someone can help me with the overlow position.
 

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Discussion Starter #5
Thanks Lynn

So on a RH drive that would be on the drivers side which would place it just about where the water is laying.

Check today and it's now dry under the car.

Will check again after I get back from the weekend away and put a clean dish under so I can check the water.

It looks very much as if it is the AC, thank goodness, strange I've not noticed it before but then perhaps i wasn't so paranoid about it.
 

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Discussion Starter #6
Did a 150 mile round trip at the weekend.

Checked under car about a couple of hours after I got home and it was dry. Checked again in the morning and still dry but when I check agin in the afternoon, nearly 24 hours after getting home, there was a puddle of water.

The weather here has been reasonably warm so had the AC running over the weekend

I tasted the water and it seems clean so looks very much like the AC drain. Any explaination as to why it should have taken so long for the AC to drain?

I've also checked the header tank and the water level hasn't dropped, so again everything points to the AC drain which is encouraging. Keeping fingers crossed that this stays the same over the coming weeks which will put my mind at ease.

I'm begining to think that the puddle of water I was seeing before the head gasket was done was the AC drain and not the gasket. Strange though that nobody picked up on this when I described the water under the car.
 

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Discussion Starter #8
Thanks Lynn

It certainly is curious. When I spotted the water it had stopped dripping.

The car seems to be running OK so I suppose provided the header tank doesn't need topping up on a regular basis, i.e it's not losing water, perhaps I should just treat it as one of the mysteries of motoring.

As you will gather from my posting I've not had much experience with AC before, it's not a standard on a lot of cars in the UK and also this is the first Mercedes I've owned.
 
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