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Discussion summary
YOUR RESEARCHExpansion Tank Connector Leak?
Leading reported evidence
Replace tank
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
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0
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1
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Performed · outcome unconfirmed · Original poster
The tank was replaced less than 5k miles/11 months ago so I don�t believe it is cracked�not the cap either.
Leading evidence: 'Replace tank' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace tank' (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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Generation: 20261026T152433Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
I can use some help. My 996 is leaking coolant from under my expansion tank. The tank was replaced less than 5k miles/11 months ago so I don�t believe it is cracked�not the cap either. So here is my situation. On the underside the tank there is a connector/sensor. I presume it is a temp or low fluid sensor. The tank appears to be leaking from that point. The connection is loose. It can move approx. � turn by only touching it. Should it be loose and is this a likely culprit? How to fix (assuming pull tank out)? I will post pics soon.
The car is a 1999 996 cab tip 114,000miles
Thanks,
Calvin
F/S 1999 996 cab tip blk/blk $23,900
do you have low coolant light on?' does it only leak under pressure? whatis the last 2 # on your cap?
1/4 turn is alot if you're just touching it.....
might have to take the tank out and investigate...
Low coolant light is not on. Only leaks under pressure. A few drops last week. A few ounces yeasterday.
Looks like I know what I am doing this weekend.
Calvin
I have the same problem with my original expansion tank. Only leaks with pressure but not every time I drive the car. Just occasionally.
I doubt the "sensor" is a low fluid sensor. Even though the expansion tank is completely empty, the low fluid -light does not come on.
I have noticed, that the expansion tank low - full indicator is extremely sensitive about how level the car stands on the ground. A tilt of just a degree or two affect the measurement a lot.
I have never had a problem with overheating though - even though I have had to add fluid to the system.
That sensor is the low level light indicator. It goes in the expansion tank by turning it 1/4 turn. It has detents that hold it in. It doesn't acutally go through to the inside of the expansion tank. There's a floater on the inside around the area that the sensor goes in. That thing being loose has nothing to due with a leak. It's possible that the tank is just leaking again. They usually crack on the back underside, so maybe fluid is just going to the lowest point.
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