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What if... a piece of the old mono valve had dropped into the coolant passages and got stuck inside the Thermostat!? I vaguely recall seeing the bottom of the old one thinking that there was something there that wasn't right - unfortunately I didn't save it.
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1987 Mercedes 300SDL; SOLD
1985 Mercedes 300D; SOLD 
2006 Honda Pilot - wife's ride; 122K;
1995 Toyota Land Cruiser - 3X locked; 182K
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