3 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCH99 Coolant pump and thermostat leak
Leading reported evidence
Replace both
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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Discussions that performed work without a confirmed outcome
1
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Performed · outcome unconfirmed
It was either the 996 106 851 03 or the 996 106 850 06 and my indy replaced both.
Leading evidence: 'Replace both' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace both' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Suggestion
A 996 water pump gets replaced every 60,000 miles and if not done, this is what happens.
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Suggestion
You should replace the water pump, and the thermostat with new gaskets.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
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Suggestion · Original poster
I have removed the water pump and thermostat and will replace with new parts.
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Suggestion · Original poster
And am using the Bentley and 101 projects books and YouTube.
Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.
3 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
0 acknowledgements have no verified action link; they do not establish a repair result.
Generation: 20261026T200546Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
I don�t know anything about working on cars but the point of the 996 was to learn. And am using the Bentley and 101 projects books and YouTube.
I have a 99 w 80k miles. The other day there was a squeak squeal and then a whooshing pop. I looked under and see this.
I have removed the water pump and thermostat and will replace with new parts. I have a low temp thermostat.
my question, short of just replacing all this is there some way to trouble shoot what actually happened? Nothing looks obviously broken to me & the hoses are supple and flexible. Can I tell if it was the thermostat or hose, etc?
thanks
It's not the thermostat, or the hose. It's the water pump internal seal that failed, allowing water to leak into the bearing which subsequently failed, which caused the squealing noise. A 996 water pump gets replaced every 60,000 miles and if not done, this is what happens. You should replace the water pump, and the thermostat with new gaskets. The hoses probably would last until 100,000 miles.
Troubleshooting: while the engine is all assembled, you apply pressure to the coolant system and see what leaks. It's obvious in this case. The other thing you can do is to spin the water pump by hand. Any noise, wobble, looseness at all, means it's gone.
Congrats on the new hobby! Couple of things to know while working on this. Your coolant should be pink, not green (although there may be an acceptable green coolant). To refill this, there may be a poor mans way to do it, but the quickest and most efficient way to refill is with a vacuum tool. You will need an air compressor and a tool to draw a vacuum from the the expansion tank filler cap. The tool is routinely on sale at Pelican and you can get a cheap one on Amazon for even less.
There are 16 coolant hoses around the engine and they all need to be replaced in my 21 year old car. I decided to wait and had one of them blow catastrophically on my way home from the track. Mine is a cabriolet and I was alerted to the failure when I slowed at a stop sign and giant cloud of steam blew forward over me. It was either the 996 106 851 03 or the 996 106 850 06 and my indy replaced both. Oh, the fun we can have with these!
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