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Old 08-28-2006, 11:46 AM
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I found the problem. The radiator top end cap has a very slow leak in a small area where it meets the radiator core. This has been tricky to find because I had never seen the car drip/leak/etc. coolant. I probably have never found it because most trips have been long enough that the coolant has been lost during the driving and no more is lost once the coolant level is at the seam.

I found the leak buy filling the radiator to very top, driving just long enough to get the temperature past 80C, and then parking the car in an uphill position. Now it is hot expanded fluid with no air cushion. This revealed the small leak. The car does not seem to lose any more fluid once it is at the level of the seam.

Can the end cap be removed and resealed or do I need to replace the radiator?
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