It's clear that one of the issues is failure of the radiator fan's low speed system. In trying to operate the aircon, you've effectively run the basic low speed test. The stahdard way to do this is to invoke aircon operation by pressing the demist button. Aircon operation requires the low speed fan to coole the condenser (mounted in front of the engine radiator). If the low speed doesn't run, the aircon system will overheat and trip on the emergency cooling (high speed fan). This runs for a few seconds until the gas pressure is reduced to normal. This cycle repeats until aircon operation is switched off. The fix for this is a replacee,nt low speed resistor. You can source these from traders, electronics outlets and eBay.
From your description, there may well be an unrelated problem with the engine control system. This may be a consequence of driving through flood water.
TC
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