Found this Infront of my right rear tire!!!
 

woke up this morning, pulled the Boxster out of the garage while it was running I decided to just wipe her down with a micro-fibre cloth......my cloth dropped on the floor so I went to pick it up and I found a surprise infront of my Rear Right Tire...... a nice puddle of coolant very slow drips, seems to drip only when the car is on. I also notice that I have some condensation over my oil/coolant cap. Should i be extremely worried!

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It could be a couple of things.
The condensation points to a bad coolant cap or pressure relief.
What version of coolant cap do you have, as in what are the last two numbers?
The newest revision ends in 04, so try that.
Losing coolant while the car is running is likely a cracked and leaking coolant tank.
Ask me know I know; I just swapped mine out for the same reason.
Lift up the trunk carpet, and if you have a puddle in there on the right side, I'd bet your coolant tank needs replacing. I swapped mine out in just over 4 hours.
Let us know what you find.

Looks to be dry but I have to remove the foam to fully check?

It's easier to check with the foam liner gone, but if it's dry, it's dry.
You might just need a coolant cap ar pressure relief valve. What version of cap do you have?
Much easier and cheaper than replacing the coolant tank.

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Ok finally got a chance to look..... Don't know if you can see it but end number is a 0, looks to be an original!

Part number is on the top side of the cap. :)

That location is also the vicinity of the water pump. Is it due for a change?

If I'm not mistaken that's where the coolant overflow is. If you look upwards in that area you should see a small hose hanging there.

Looks more like water pump are than coolant overflow. That's usually closer to the tire.

Ok so the weird thing is I started the vehicle and let it run with the heat on and no dripping at all, but still have condensation under trunk above oil/coolant cap.

Here is my cap with the code on top!
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Your cap part # ends with 01. I had the condensation issue last year, read posts here about it, ordered a new cap (ending in 04) and no more condensation. I did not have the issue of coolant dripping out however.

Larry Galler
(The Bald Eagle)

That is the original cap. As you have noticed, it will leave a mist on the underside of the trunk lid. It has been updated and the latest model number ends in .04. Independent of the source of your leak, replace the cap.

You also need to look and see if your vent purge is leaking. Pull the Oil cap and the Radiator cap off. There is a thin black plastic plate covering the vent purge at the bottom of that service area. It is not obvious that it comes off.

The trunk coolant tanks are notorious for leaking. I have not had the pleasure yet, but I understand that they are quite challenging to X/O. The general consensus is to use OEM tanks only. The aftermarket tanks are generally poor quality.

The site search function is your friend. Also, Pelican Parts - Porsche, BMW, MINI, Mercedes, Audi, Volkswagen, Saab, Volvo - Auto Parts and Accessories has plenty of DIY articles with pictures

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Had the same problem mate, except mine literally poured all of its coolant. I had the #01 cap, went into Porsche, bought the #04 cap and it's been perfect since. That'll be the problem :) nothing to worry about.

I had a similar problem and replaced the cap with the updated .04. I thought that solved the problem but with the transaxle removed to install the LN Engineering ISMB kit, it was clear that the coolant tank was leaking and, it had expanded. The tech who replaced the tank said that if you move the wire bundle next to the tank, it's easier to reach the hoses etc. After 15 years of service, the tank just crapped out. Glad it didn't totally rupture before it was replaced.

Strange, my cap looks like that but no numbers at all. Just a tiny "Germany".
Perhaps not a Porsche cap?
02 S

Is the best time to replace the tank when the trans is out ?

Yes It's easier when the transaxle is out but not the best time if it ruptures before you get the transaxle out.

Same for me. It kept randomly burping out coolant. New #04 cap was the ticket.

Thank you all for your help!!!


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Ok just got back from the dealership and picked up the updated coolant cap.......
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