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Looking at spec sheet 5 (circuit diagram) for you it looks as if you need to go to the dealer and get them to initiate a full Cooling & AC systems test on yur Box. This is done from their PIWIS Tester II only.
There are relays for everything:
Cooling water Blower Motor 1 relay
- Relay Step 1
- Relay Step 2
Cooling water Blower Motor 2 relay
- Relay Step 1
- Relay Step 2
Ther is also a 3-lever cooling water switch which gauge low/high pressure and mean pressure. Those are linked to the relay circuitry.
Your problem could be anything in that range. To pin point it to the source, only the PIWIS tester II will be able to detect your fault.
Other than that, you have to rule out one-by-one and perhaps end up changing all the relays before getting to a point where it's not fun anymore to DIY. I've been there done that a few times :/
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