[vikram_d]

Originally Posted by beast_within

Now my query goes like this-

Since the temperature is not set to the lowest position ("Lo"), is ACC still mixing some amount of hot air and compensating this with full blower speed for a longer duration to bring down temperature inside the cabin?

Or the ACC logic is intelligent enough not to mix the hot air with cold air (although the temperature is not set to the lowest possible value). Since mixing of hot air is not required in this case and will only decrease cooling performance.

In other words I wish to know if the ratio of Cold:Hot air is hard coded into the ACC logic for very temperature value (Lo, 18, 19......31, 32, Hi) and only the fan speed is varied based on the inputs from various sensors.

The ACC uses a simple logic. It runs at full blast till the set temperature is reached and after that it starts mixing hot air, lowers the fan speed etc. to maintain the set temperature.

This is a very simple explanation, but I am sure it also takes feedback from the various sensors to figure out the rate at which cooling is happening.

[Kaumad]

On the lines of what Vikram had mentioned earlier, please also get the ECT sensor checked. A faulty ECT sensor sends erratic temperature readings to the ECU which tends to cut the a/c compressor off sporadically.
Happened to me on my SX4.

[S5157]

I have received the car back and issue seems to be resolved. I couldn't at the workshop during the fix but as per MASS, they have removed and cleaned thermistor and cooling coil. I have driven the car for ~50 KMS and compressor is working well.

Thanks for all the help.