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Found this in an old section of John's original repair sections from back when dinosaurs roamed the earth.

Matrix Temp Sensor: Lonn Howard reported an intermittent HVAC problem that turned out to be caused by this sensor. After the air-conditioner had been on AUTO (or a manual setting other than LO) for a while the system would suddenly put full-hot air to the windscreen vents and the Testbook symbol would appear. By manually dropping the temp setting to LO on both sides it was possible to over-ride the fault and get the A/C back on. The Testbook revealed a bad temp sensor on the hot-coolant input pipe of the heatermatrix. By pulling the cover under the glove box (or steering column if RHD) it is possible to snake your hand up to release the sensor and disconnect it from the wiring. Lonn used heatsink compound when installing the new one to ensure good heat transfer to the sensor.
 
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