Hey mate, this may be related to the thermostat being stuck open - does the temperature gauge show the engine reaching operating temp? I had the same issue with really poor heater performance before I replaced my thermostat.
Hey mate, I've also got an AUM and had this issue fairly regularly and found that unplugging my failing SAI pump fixed the problem. I have left it in situ so there's no need to play around with the piping until I get the time to remove it entirely.
This is totally anecdotal, but I recommend...
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