**NEED COOLANT LEAK REAR WHEEL- images attached - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Jager · 10-12-2013, 05:26 PM

Water pump... Looking at your photo taken underneath the car, it looks like the leak begins just below the water pump area.

woodsman · 10-12-2013, 05:30 PM

the waterpump is on the FRONT of the engine...

Jager · 10-12-2013, 05:53 PM

Quote:

Originally Posted by woodsman

the waterpump is on the FRONT of the engine...

Yes it is... I think the moisture we see on the Diagonal Brace is from driving while leaking (blown-on), if that puddle on the ground is starting ~10" to 12" in front of the rear tire my bet is the water pump.

max_asdf · 10-12-2013, 06:34 PM

I went to check the area top of the coolant cap in the rear trunk and there was lots of condensation directly above the cap on the metal hood.

2 weeks ago the coolant cap was pulled and coolant was topped up, maybe 1L maximum was added. should it only start to leak now after such a long period of time? Today was a warmer day and I drove it longer than normal if this helps diagnose anything.

does this conclude that it is the radiator cap problem?

is there only 1 radiator cap to this car? I only need to replace the one in the picture correct? Hope this will resolve my issue...

ALSO:

I took it for two drives after posting this thread, to dinner and back, each one approx 20 minutes. after each drive i have yet to see any leaks.

I did hear some light knocking noises 2 days ago, when i put my ear close to the side vent. It was not extremely loud or abnormal so I left it, but something definitely sounded different. sounded it was ticking faster than normal. is this the water pump noise?

if it is the water pump, should it be dumping coolant on the ground every time i drive the car?

note: no low coolant light, or check engine light, no over heating.

thanks for all the help.

seventythree · 10-12-2013, 08:25 PM

Cracked coolant tank.

And yes, in the beginning, it will only leak when there is enough pressure build-up. Later on, it will start leaking profusely as soon as you start driving the car.

max_asdf · 10-12-2013, 08:31 PM

ok, im not sure how to pull the carpet. are the 986 and 987 different. i forced my way through the carpet and was able to feel one or two spots near the tank and side of car, felt dry.

i took the fasteners out, but on my 987 the carpet is attached to styrofoam below. also the trunk latch has no screws, im not able to detach the plastic cover for the latch from the carpet.

Jager · 10-13-2013, 09:49 AM

Can you get under the car to look? How about looking at the water pump from the passenger compartment? You will have to remove the carpet behind the seats and remove the cover. There will be coolant or residue behind and below the water pump pulley. Also, you can remove the belt and spin the pump with your hand to get a good idea of the condition of the pump. If the pulley wobbles or the pump make any grinding noises when spinning it's bad.

thom4782 · 10-13-2013, 06:17 PM

I think Jager is on the right track. The puddle begins pretty far forward. Could be the water pump. Worth checking at least especially if the quick check under the carpet seems dry.