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mcvgums
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mcvgums Member

mcvgums

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I replaced my coolant tank on my 99 996 C2 coupe as instructed in this forum and burped the system when done. Since the replacement, I had a terible coolant eruption that looked like it came from the cap, and I assumed I had not tightened it completely. Several more times since I am suspecting coolant spill and it looks like it is from the cap. I replaced the reservior, sensor and cap with the suggested parts from Sunset, but I am stumped as to what might be going on. Any suggestions would be appreciated. :help:

It is a shame to have such a nice car and be afraid to turn the AC on. :renntech:

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mcvgums Member

mcvgums

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The new cap has 01 as the last 2 numbers, and there is some dried coolant that looks like it sprayed from the new cap. I wiped it clean and there is more evidence of it leaking. Is it possible to crossthread it? Is there any sense in trying the old cap?

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Ubermensch Member

Ubermensch

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Yeah, if the old cap wasn't leaking then it might be worth a try. I guess you might have a bad new cap?

Should the "00" caps be replaced even if there's no problem with coolant leakage. Does the new cap prevent damage to the reservoir?

Shawn

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TRIATHLETE Member

TRIATHLETE

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Dealers were supposed to replace the 00 caps long ago -- but many were missed. The 00 caps are known to leak. The newer 01 caps (usually) don't leak.

I replaced my coolant tank last August and reused the old cap assuming it was the new version. I had to add a little coolant every couple of months until I realized the old cap, orignial 1999, was leaking.

I haven't had any coolant loss in six months since replacing the cap with the latest version.

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