Porsche 996 coolant leaks

Discussions that performed work without a confirmed outcome

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Discussions that contain suggestions

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Suggestion · Original poster

As I was getting halfway into changing the AOS on my 03 C4S I noticed lots of coolant pooled up on top of the block under the drivers intake manifold near what I think is a knock sensor.

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Pooled up coolant

Suggestion · Original poster

I'm in the process of changing the AOS on a new to me 2003 C4S and found a bunch of coolant pooled up on the drivers side of the block near what looks like it might be a knock sensor?

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Coolant pooled up on block

Suggestion · Original poster

Did I introduce air bubbles into the system by replacing the AOS?

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Oil on Secondary Air Injection Check Valve?

Discussions that contain suggestions

54

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Suggestion · Original poster

I'm kind of set on the Ohlins but still waiting to do the test drive before pulling the trigger.

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Search is over - 996 40th Jahre!

Suggestion · Original poster

Walked me through all the options and what each setting will do and went out with me for a test drive after.

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Search is over - 996 40th Jahre!

Suggestion · Original poster

From there on I buttoned things back up and got the car ready for a test drive.

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Search is over - 996 40th Jahre!

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Suggestion · Original poster

I did change the cap, so i was pretty sure that was probably the cause of the coolant leak/smell observed initially.

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Engine lid fan question

Performed · outcome unconfirmed · Original poster

Two years ago, it was pressure tested and appeared fine, so I changed the cap.

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Peanut butter on the floor... intermix?

Performed · outcome unconfirmed · Original poster

I replaced the cap on Tuesday and tightened very snug.

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Help with coolant issue

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Performed · outcome unconfirmed · Original poster

Water pump was replaced 10k ago, coolant tank 3k ago.

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Guess this leak!

Suggestion · Original poster

Is that a sign to change the water pump?

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Newbie here

Suggestion · Original poster

Thanks for the feedback - so you guys are thinking I need to replace the water pump?

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Coolant Leak

Discussions that performed work without a confirmed outcome

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Suggestion · Original poster

The shop wanted $750 to replace the tank.

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Coolant overflow tank cracked?

Suggestion · Original poster

The old owner was very keen into avoiding to buy original parts it seems, he told me he changed the tank but if the original cost that much then he used the not oem one for sure.

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Newbie worried about coolant leaking

Suggestion · Original poster

The car has started to leave a puddle when i park it (near the driver exhaust side ) and I realize that i likely need to change the tank.

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dumb question on coolant tank

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Suggestion · Original poster

Drive car for 1 mile and check coolant level after, add coolant as needed and repeat until no more coolant loss

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2002 996 C4S - Coolant loss (AOS, Cracked Head, Gasket???)

Suggestion · Original poster

So at this point, everything is back together and I'm chalking it up (for the time being) to a leaky cap (which has been replaced) and a lack of checking coolant level on my part.

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Coolant Issue

Suggestion · Original poster

Coolant still continued to leak a little so I've got it booked in to my indy for Tuesday - he just said to check the coolant level before I drive off in the morning to make sure it hasn't fallen too far.

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Spring Leakfest!

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Suggestion · Original poster

Changing the Oil:

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List of common FAQ/fixes/issues etc.

Suggestion · Original poster

All I needed to do is change the oil when I got home.

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Search is over - 996 40th Jahre!

Performed · outcome unconfirmed · Original poster

Oil was changed 2 weeks ago (Total 5W40).

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Solved - Knocking noise (let's speculate...)

Discussions that report a fix

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Discussions that performed work without a confirmed outcome

5

Discussions that contain suggestions

28

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20 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Reported fix · Original poster

Crazy thing- I filled it with water and ran the engine to operating temp. No more leak.

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Coolant Leak - is it the pump?

Suggestion · Original poster

100 miles and things are fairly smooth, no more smoke and smooth running engine.

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2002 C4S - HPDE Day Resulting in White Smoke and Cyl 6 Misfire

Performed · outcome unconfirmed · Original poster

I ran the engine for a while to get it up to temp, occasionally giving it some revs by hand operating the throttle body.

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MB Motorsports Engine Rebuild - A Warning

Discussions that performed work without a confirmed outcome

8

Discussions that contain suggestions

24

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Performed · outcome unconfirmed · Original poster

I ran the car for about 2 min.

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When water pumps attack!

Performed · outcome unconfirmed · Original poster

They say they've ran the car to full temp and it wouldn't leak and the pressure was stable.

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I'm losing faith :(

Suggestion · Original poster

- For the whole session, I was basically running the car near redline, a few times, I mis shifted and trying to accelerate out of a corner at anything under 6k rpm, is not great- you lose all drive and momentum.

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First trackday on the 996. Tips and/or advice?

Discussions that performed work without a confirmed outcome

5

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Performed · outcome unconfirmed · Original poster

After a bit of time I shut things down and checked for leaks but there were none.

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Search is over - 996 40th Jahre!

Suggestion · Original poster

Still up on the quickjack with the bumper off so I can check for leaks.

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Stuck thermostat

Suggestion · Original poster

Just to make sure your system has no leaks or is there another method method to check for leaks before refilling?

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Porsche C4S water pump replacement tech question and parts list

Discussions that report identifying a cause

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Discussions that suspect a cause

7

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Reported cause · Original poster

It was the Water Pump.

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I think I have a coolant leak! [updated]

Reported cause · Original poster

Update - it was the water pump.

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Coolant Leak - Happy 4th of July

Reported cause · Original poster

Well taran - thats exactly what it turned out to be - water pump!

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coolant escaped onto engine?

Discussions that report identifying a cause

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Discussions that suspect a cause

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Reported cause · Original poster

This is a old post but it was the AOS.

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Coolant Leak

Reported cause · Original poster

Just because I hate it when threads are not updated - it was the AOS.

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Changed my air filter, removed Hemholtz, and WTF smoke - help

Reported cause

I did the coolant tank last weekend thinking that was source of my leak but it was the AOS.

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Failed water pump?

Discussions that report identifying a cause

5

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Reported cause · Original poster

That's the leak that turned out to be the coolant tank.

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Last of the PM... back to the driving

Reported cause

I smelled a faint odor of anti-freeze for a long time with no real sign of a leak that eventually proved to be a coolant tank.

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996 Coolant disapearing and reappearing

Reported cause

The only time I have smelled anti-freeze at the Boxster is from what proved to be a bad coolant tank.

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I smell anifreeze...

Discussions that report identifying a cause

6

Discussions that suspect a cause

3

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Reported cause · Original poster

Initially it was the cap and that got resolved..

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Spewing Coolant

Reported cause · Original poster

The good news is that I feel pretty confident that it was the cap.

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Slow Coolant Leak

Reported cause

It turned out to be the cap

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Where's my coolant?

Discussions that report identifying a cause

6

Discussions that suspect a cause

3

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Reported cause

But alas, she started dripping coolant and I followed it up to the source and found it was the tank

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Coolant Tank Replacement Tip - Read before you replace

Reported cause

Via process of elimination I was pretty sure it was the tank so I replaced it.

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Plans to replace coolant expansion tank just got moved up

Reported cause

When I smelled antifreeze (just a single whiff) from my Turbo it proved to be a leaking water pump seal and when I smelled antifreeze (just a whiff once in a while) from my Boxster it was the tank.

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Coolant Smell

Discussions that report a fix

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Discussions that performed work without a confirmed outcome

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Discussions that contain suggestions

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1 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

20 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Reported fix · Original poster

Crazy thing- I filled it with water and ran the engine to operating temp. No more leak.

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Coolant Leak - is it the pump?

Suggestion · Original poster

100 miles and things are fairly smooth, no more smoke and smooth running engine.

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2002 C4S - HPDE Day Resulting in White Smoke and Cyl 6 Misfire

Performed · outcome unconfirmed · Original poster

I ran the engine for a while to get it up to temp, occasionally giving it some revs by hand operating the throttle body.

Original post Read captured discussion

MB Motorsports Engine Rebuild - A Warning

Discussions that report a fix

1

Discussions that performed work without a confirmed outcome

8

Discussions that contain suggestions

18

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

17 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Reported fix

Replaced coolant tank and fixed the problem.

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Coolant Level and obsurd vanishings!

Performed · outcome unconfirmed · Original poster

Well at least I replaced the coolant tank before it failed but ugh, this is the problem with replacing parts before testing.

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Puddle of coolant on garage floor

Suggestion · Original poster

well, no, it's not 9 hours to replace just he coolant tank, it's 9 hours to repair the transmission leak, replace coolant tank, and change out two engine mounts.

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Help fluid leak

Discussions that report a fix

1

Discussions that performed work without a confirmed outcome

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Discussions that contain suggestions

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1 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

5 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Reported fix · Original poster

Pump leaking now replaced along with 2 year old cambelt all good now.

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Coolant leak.

Suggestion · Original poster

There are hints in some of the posts that the two are related somehow, but I never saw a coolant light; it just needed changing, along with every other fluid.

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2002 C4S PURGE FAN FAULT

Suggestion · Original poster

The air/oil separator was replace along with the ims bearing a couple years ago Redline Racing in El Paso Texas.

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1999 996 Leaking ALL oil !!!