9 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHCooant Loss overtime
Leading reported evidence
Replace after the coolant tank
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
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Read evidence and context
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Discussions that performed work without a confirmed outcome
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Leading evidence: 'Replace after the coolant tank' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check are the radiators and the heater core' (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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Performed · outcome unconfirmed
and most of the old rubber coolant hoses replaced with
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Suggestion
A couple of things to check are the radiators and the heater core.
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Suggestion · Original poster
Radiators had some debris which I will clean but looked dry.
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.
9 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: 20261027T175704Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
My friend bought a used 99 Boxster this past weekend. Upon picking up, the coolant light was blinking. We noticed when we were test driving, no temp issues.
I looked in the tank and it was low enough that in needed probably 2-3 cups to register as okay. Is coolant something that will need to be periodically topped off over a 20 year life?
I looked at the oil, I looked in the coolant tank, no sign of coolant/Oil mix in either. Oil cap was clean. No strange smoke. No dampness behind the passenger seat or in the truck carpet. No puddles under the water pump. The guy did say he replaced the water pump, maybe didn't bleed properly.
Car ran great, no temps issues. He drove the car home about 100 miles or so and the coolant level held fine. Maybe he just takes to a shop and gets a pressure test on the system.
I�d think a heathy cooling system should not get low very quickly. Aside from the spots you checked... A couple of things to check are the radiators and the heater core. Those spots could be seeping and cause coolant loss.
I wonder if those would cause any puddling. Radiators had some debris which I will clean but looked dry. I have to find the heater core.
Thanks for your response.
The heater core is right behind the battery. It will usually tell you it�s leaking by causing steam to come through the cabin air vents. It�s not too tough to change.
The radiators might leak a little before they leak a lot, if that makes sense. My passenger side rad was leaving an occasional puddle. When I got in behind the bumper, I found the driver side was wet, too. But not enough to leave a puddle. I now have two new radiators in my garage for installation soon.
I had a slow coolant leak that I could not find and it was driving me cazy. I finally went to AutoZone and got a cooling system tester on their loaner tool program (you buy the tool and return it for a full price refund). It took me about 20 minutes to find the leak, it ws a hose clamp in an area that was hard to find. tightened the hose clamp and the leak was gone. This tool will also find a leak in the coolant reservoir or the cap.
I had a similar issue, the coolant tank would be low over time and later I noticed a small drop of coolant on the driver's side. After the coolant tank was replaced with a
factory
replacement, a
new factory cap,
and most of the old rubber coolant hoses replaced with
factory
hoses, I still had coolant loss issues. With abject fear of a cracked head or some other overlooked type of issues tormenting, I took it to my nearby indy and after a ten-minute look with another set of eyes, it turned out that a cracked hose clamp behind the coolant tank was the problem, the clamp was replaced and no issues since. Going forward, I will order a clamp kit and replace them as I replace all the hoses and plastic radiators sometime in the spring......
No, it�s a closed loop system, so it shouldn�t lose any coolant over time, except a very small amount due to evap when the expansion tank breather valve is open, which happens every time the car is driven. But we�re talking mls, not ounces or cups.
Probably, it�s a slow leak, and will require painstaking tracing of hoses and clamps. There could also be a crack in the reservoir tank, or the cap isn�t sealing all the way.
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