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I just got through with a P0128 code and the thermostat replacement as discussed here: http://www.lxforums.com/board/showthread.php?t=139543&highlight=p0128 (Fortunatley covered under the extended warranty.)
I was forewarned, but ignored the signs. For about the last year during "heater seasons" the interior car temperature has varied several degrees even though it was on the "AUTO" setting and should have remained constant. I suspect that this was an early sign of the interior thermostat sealing rubber gasket (not the one that prevents leaks) deteriorating, leaking and making the engine run cold.
So if you get this symptom save yourself a few bucks and replace the stat yourself on a nice day before you get the code!
I was forewarned, but ignored the signs. For about the last year during "heater seasons" the interior car temperature has varied several degrees even though it was on the "AUTO" setting and should have remained constant. I suspect that this was an early sign of the interior thermostat sealing rubber gasket (not the one that prevents leaks) deteriorating, leaking and making the engine run cold.
So if you get this symptom save yourself a few bucks and replace the stat yourself on a nice day before you get the code!
