>> After setting the temperatures on both sides to "HI" and taking the car for a 20 minute fast A-road drive, getting the temperature gauge up to its normal half way point, the air coming out of the vents could best be described as lukewarm.
What is it like if you give the engine chance to warm up before demanding heat in the cabin? I keep my CC fan speed low as well as the temperature setting (18 deg c) until the temperature gauge is indicating ΒΌ then turn up temperature to 21 deg c and put the CC on auto. I find this lets the engine warm up quicker, and thus the heating inside the cabin follows suit. If you demand instant heat from the heater then the engine is going to take longer to warm up, along with the heater.
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