AC/Heater AC fan interval - Civinfo
 
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post #1 of 8 (permalink) Old 8th July 2010, 01:54 Thread Starter
 
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AC fan interval

I have tried to search it, but didnt find-does it sound right for AC fan: 40 sec ON, 5 sec OFF, 40 sec ON, 5 sec OFF aso...it has always bothered me that it turns on and off so often and i have never had a car with AC before soo...yeh....
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post #2 of 8 (permalink) Old 8th July 2010, 14:50 Thread Starter
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anyone?!?
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post #3 of 8 (permalink) Old 8th July 2010, 16:08
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IIRC it varies according to the amount of work it has to do. Try testing it at night to see if the cycle changes.
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post #4 of 8 (permalink) Old 8th July 2010, 16:48 Thread Starter
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that cycle was at night-outside temp was 20 C and climate control was set to 23 C. And i did one other test: i set climate control to MAX temp and turned AC OFF-nice hot air came out. Now i turned AC to AUTO with same temp setting and air became a lot cooler... why it even starts AC with max temp?
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post #5 of 8 (permalink) Old 8th July 2010, 21:30
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The AC will run nearly all the time to dry the air. So it is cooled and dried by the AC and then warmed up again by the heater matrix. It makes it more comfortable inside, and stops the car from misting up.

So long as it is cycling, and the air can be cooled, then it sounds like it is working fine. Just set it to Auto and something like 20C, and all should be fine.
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post #6 of 8 (permalink) Old 9th July 2010, 14:37
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AC compressor works in this manner: in the cabin behind the cooling elemnt is thermostat.
When temperature it reads is above some 6C it turns on compressor.
When temperature drops below some 2C it turns off compressor.

And so.. on.. off..etc..

PS: Compressor on = vent on, compressor off = vent off

Stated temperatures are just an example, as proper ones might vary a bit, but this is how it works.
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post #7 of 8 (permalink) Old 11th July 2010, 19:29
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The fans run at high speed for a much longer interval if the air recirc feature is 'off' on my car, and about 10 secs on, 20 secs off when the recirc feature is 'on'
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post #8 of 8 (permalink) Old 12th July 2010, 10:16
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And again, this is normal, because generally outside air temperature during summer is higher than one inside car.
So, to cool outside air more cooling is needed and fan/compressor will need to work more.
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