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Hose clamps / reservoir cap Posted by Ari [Email] ![]() ![]() In Reply to: Coolant Leak, Aom, Thu, 7 Sep 2006 21:36:25 Members do not see ads below this line. - Help Keep This Site Online - Signup |
The first thing I'd do is tighten all the hose clamps (engine cold). As hose clamps loosen up, you can get a situation where it leaks only for a short time just as the engine is warming up. The coolant temperature, and therefore pressure comes up fast, but the hose nipples rise slower. So you leak out some fluid, usually as you're driving along. You don't see the drops. When the nipples warm up, they expand and close off the leak. Any fluid then evaporates. When you shut off the car, the temperature and pressure drops slowly, and the leak stays sealed.
I would look for signs of leakage - a greenish or whitish powder around areas where hoses join into nipples, and along the side of the radiator where the end pieces fit. But it never hurts to take a nut driver and tighen up every hose clamp you find. I see this more in a few months when the weather gets colder, and the bigger temperature swings make the problem a bit worse.
The other thought would be a bad coolant reservoir cap. It is supposed to vent at high pressure. Sometimes the vents go bad, and vent a lower, normal pressure. This allows some coolant to escape. Not quite sure how to test that other than to replace the cap. I'd start with the nut driver.
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