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YOUR RESEARCHNeed advice on 996 issues
Reported repair
Replace coolant tank and sensor
Reported resolution
1
Reported fixes
0
Unsuccessful attempts
1
Discussions
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Discussions that report a fix
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Reported fix
I had similar issue of loosing coolant...took it to my mechanic and they replaced the coolant tank and sensor. Problem fixed.
Leading evidence: 'Replace coolant tank and sensor' (1 discussions report resolution; 0 report an unsuccessful attempt). Across 1 matching discussions, the most frequently mentioned possible cause is 'seeping head gasket or cracked cylinder head' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Replace coolant tank and sensor' (1 discussions). For that action, 1 discussions report a resolution and 0 report an unsuccessful attempt. The most frequently reported fix is 'Replace coolant tank and sensor', supported by resolution reports in 1 discussions. These are forum reports and suggestions, not a confirmed diagnosis.
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Discussions that suspect a cause
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Suspected cause
Ouch, if it is missing when you first start it, it is probably a seeping head gasket or cracked cylinder head.
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.
Discussions that contain suggestions
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Suggestion
Why not start with replacing the coolant cap($20) and if that doesn't fix your problem replace the tank.If you still are leaking coolant you'll have to spend some more $$.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
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Suggestion
They did tell her it might be a bad headgasket, etc replace your motor.
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Suggestion
Why not start with replacing the coolant cap($20) and if that doesn't fix your problem replace the tank.If you still are leaking coolant you'll have to spend some more $$.
Replace tank.if you still are leaking coolant you'll have
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
1
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Suggestion
Why not start with replacing the coolant cap($20) and if that doesn't fix your problem replace the tank.If you still are leaking coolant you'll have to spend some more $$.
Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.
12 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
0 acknowledgements have no verified action link; they do not establish a repair result.
Generation: 20261026T200546Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
I have a 1999 996 that I keep loosing coolant. I have pressure tested it and never see a leak anywhere. When I start it in the morning it seems to mis a bit then it's ok. I never see smoke when starting it though. If I start it in the morning and go and unscrew the cap I hear pressure being released. Think I need headgaskets?
Why not start with replacing the coolant cap($20) and if that doesn't fix your problem replace the tank.If you still are leaking coolant you'll have to spend some more $$.
Ouch, if it is missing when you first start it, it is probably a seeping head gasket or cracked cylinder head.
Coolant gets onto the spark plug and temporarily fouls it.
Classic sign is the miss at start-up, then clears up once engine burns out the residual coolant.
open the trunk. remove the oil filler cap, coolant cap and dipstick. there is a plastic cover below all of that; remove it. put the caps back on. you will see a funny looking valve with a silver tab on it. this is your pressure relief valve. if it goes bad, it will release vapor to the atmosphere through a tube in the right rear wheel well.
you can replace this valve for around $30. after you replace it, burp the system by pulling the silver tab into the upright position. allow the car to achieve normal operating temp and close the valve. all done.
If the coolant tank is leaking, you often get a faint smell of coolant as it evaporates off the driver side muffler. You can also often see residue on the engine compartment side of the wheel well from coolant staining.
When the reservoir cap goes, it usually dumps significant amounts of coolant (as in emptying the reservoir).
On a nonPorsche car, I can only speak from experience.
My boss' car was losing coolant and none of the stealers she went to could find the leak. They did tell her it might be a bad headgasket, etc replace your motor. When I looked at the car, I could not find the leak under idle. Once I 'cracked' the throttle the leak came from the water pump itself. All my Fords has this water pump issue. Aside from the known coolant tank issue, check this out.
It could also be a leak in the lines or radiator itself. You'll see telltale residue at the source if it is a leak.
GL
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