Jumped in the car on Monday to drive home to find the from screen covered in thick mist that wouldn't clear and a overheating coolant smell. The water temperature remained normal, after a bit of research the heater matrix seemed the most likely culprit. As it turns out it's not that big a job as it is on normal cars where the heater matrix sits on the inside of the bulkhead in a Boxster it 's on the outside so easy replacement. I expected the matrix to quite expensive OEM £416 or Hella £120. Guess which way I went? Hella, correct.
Anyway this how to swap one out.
Remove the wiper arms, then the 3 Torx screws on the plastic scuttle
At either edge of the windscreen are 2 nuts
Disconnect the wiring to heated washer jets and remove the wiper scuttle
in the centre you can see where the matrix is, behind the battery under the membrane
Remove the wiper motor 3 screws,no need to disconnect the wiring just move to one side
Disconnect the 2 struts, 3 screws each
Clamp the two hoses
Remove the membrane and undo the jubilee clips
The matrix is held in by two screws and spring clips
Reverse the procedure to finish off. You may will need to bleed the coolant system after I filled the matrix up with coolant before I put it back in.