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Originally Posted by ccooper
• Hard upper radiator hose after overnight cool-down. Opening the overflow releases pressure and the hose becomes pliant. Textbook, I know, BUT …
• NO coolant loss noted in two years. The Coolant Idiot Light comes on sporadically and the level does go down at higher RPM. I checked the sensor for resistance – it checked OK.
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While it is odd you haven't had to add coolant, the level going up and down and the hard radiator hose were 2 things I noticed on my SDL when the head crack was developing/worsening. Actually at first I didn't have to add much coolant either, but eventually had to add more and more frequently. I never saw any abnormal temperature indications (at least no different from what I see now with the -17 head). I never had any white smoke or coolant in the oil.