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One possible answer is if the radiator cap is bad. Now you have to remember that there are two seals on every rad cap. The outer one, for sealing the cap to the radiator (or pressurised overflow), and a second seal on the pressure relief valve. If either of those seals is bad, hot coolant will be able to undetectably escape the system, thus causing no signs of a leak, yet lowering the coolant level in time. Try replacing the radiator cap.

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โˆ™ 2006-09-11 20:22:00
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Q: What causes an engine coolant fluid loss in reseservoir and some in radiator after about a week of driving no leaks from radiator?
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