I had similar problem with a 99 Taurus. Turned out to be a hair line
crack in the header/overflow tank. The shop I went to was about ready to
replace the engine, they suspected a cracked block as they could find no
external trace of a leak. Then one of the older mechanics noticed that
the overflow tank had a slightly whitened appearnce at the pint where
the plasic mounting met the rest of the tank. Pressure testing did not
cause a leak, but vibration and pressure would. solution relaced tank,
This car had this cracked reservoir tank problem 2 years ago and I did
replace it. Then the coolant loss problem slowly came back a year later.
Could it be that the tank is cracked again? Hmmmmm.... I will take it off
and examine it this weekend. I am eally hoping that its just that and not
anything major. The car runs well. I just don't understand it. Since my
last posting, I have checked the area around the water pump, all the hose
connections, etc and nothing visible. I even applied a dye and later
looked around with UV light. Nothing! I still smell coolant after the
engine is running for a while and I come to a stop. So wherever this leak
is it must be close to the ventilation air intake. The reservoir is one
very possible suspect. Wish me luck.
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