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Everything posted by brus brother
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Use the Search function. Clunk sound at slow speeds as when turning into a driveway over a small bump? This was diagnosed as hydraulic knock on my 2000 Legacy and I was told that it was present in many previous years. There is a kit that ? fixes it by installing a damper in the power steering fluid line. It's certainly less problematic than the dreaded torque bind.
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Look carefully for source of leak. Removing the timing belt cover should make it easier to see if the water pump is the culprit. Can you keep an eye on the radiator and hoses to see if they are the culprit. While this involves some "down and dirty" time of your own, this sort of diagnosis may remove the guesswork. There is also a dye that can be added to the coolant that can be detected under UV light.
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I assume your car was recalled and the additive to extend HG warranty to 100K miles / 8years? Check with SOA that this recall was performed. If you are going to change the coolant, be sure to add the Subaru additive to the coolant and keep a record of the purchase and mileage so as to keep the extended warranty valid. NOTE: check on this site for nuances of refilling and bleeding the coolant system. If not done properly, you can cause air pockets that allow for local areas of overheating and ... yup, you guessed it, HG failure!
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As per your post, if you find antifreeze pooling on the outside of the engine, why do you think your leak is internal? The 00 models are prone to external HG failure right at the area you describe and SOA extended the warranty to 100,000 miles and 8 years (did you get a notice?) IF you allowed them to put a conditioner (some sort of stop leak) in the coolant. Get the codes cleared quietly, have the conditioner added and then go back and let them determine if the HGs are failing. Is the 140,000 mileage you quote in miles or kilometers?
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There is a dye that you can add to the system and check with a UV light for subtle leaks but your's seems like it should be fairly noticeable with the naked eye. The 2000s were part of the external head gasket leak crowd and I think the principal offending area was at the rear cylinder on the driver's side. It may be cooking off on the hot engine and therefore not noticeable but again the volume you mention seems pretty significant. Look for crusty staining on the engine and check for external leaks while the engine is still hot.
