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I recently had to replace the water pump on my 2001 Boxster.  This all went fine, however, the red light to the right of the temperature gauge is blinking at 1 Hz.  I've read this indicates low coolant level.  I followed the factory procedure to bleed the system and it is filled to the max, but the light still blinks.  Also, the gauge is flatlined to the left.  I replaced the temperature sensor near the #4 cylinder head without improvement, and the wires "look" ok.  All the fuses are good.  Does anyone know the procedure to troubleshoot this wiring?  Or the pin and socket numbers for the wiring diagram?  The temperature gauge worked fine before the water pump blew up.  I did recover most of the impeller, but a few small pieces are in there.

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Hi to anyone who had this exact problem i have found a solution.  after i changed my undamaged water pump and thermostat i got temp gauge dead and flashing. changed coolant sensor, to no avail.  turns out that i needed to clear error codes with code reader and that instantly bought the gauge to life back to normal.  

 

2.7 boxster 2001

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