It could be the matrix, but it's not a common failure where blocked plenums is. Also coolant has quite a strong smell so possible, but check the plenums first.
Temp gauge problem: no it's likely to be a problem with the IPK
. The information about engine temperature comes in via CAN (Bus Controller Area Network)
, but so does the engine RPM. So of the tacho works, its not that. There's another thread live at the moment regarding a faulty temp guage. Carry out the checks suggested in that. If the temperature reads OK in the digital display, then its the same as in that thread, a faulty instrument pack. If the digital display also shows nothing, it could be the sensor in the engine, or a wiring problem.