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Petrol Consumption When Using Ac


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#1 starfield

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Posted 15 July 2010 - 01:03 PM

I know that it is very normal for a car to use more petrol when the ac is on. I know you can increase the airflow by activating the air recirculation.

The ac can either be on or off. The blower fan however has got 4 different settings.

My question is:
When ac is on does the car uses more petrol if the blower fan is on 4 as compared to 1? Does it consume the same amount of petrol on whichever blower fan setting you put it on?

Your views on this subject will be much appreciated.

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#2 artscot79

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Posted 15 July 2010 - 04:00 PM

I know that it is very normal for a car to use more petrol when the ac is on. I know you can increase the airflow by activating the air recirculation.

The ac can either be on or off. The blower fan however has got 4 different settings.

My question is:
When ac is on does the car uses more petrol if the blower fan is on 4 as compared to 1? Does it consume the same amount of petrol on whichever blower fan setting you put it on?

Your views on this subject will be much appreciated.


0n setting 1 it uses 6 percent more fuel and .5 percent more for each setting after that so on 4 it uses 7.5 percent more fuel however this changes depending on the environment on a really hot day the aircon works harder the recirculate only recirculates the air already inside the cabin which aids moisture build up so the aircion will work harder to remove all that moisture when you switch the recirc back off again.

#3 mjt

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Posted 15 July 2010 - 05:00 PM

the recirculate only recirculates the air already inside the cabin which aids moisture build up so the aircon will work harder to remove all that moisture when you switch the recirc back off again.

I don't think that's correct. Even the recirculated air is still going through the condenser which will be taking the moisture out of it.

#4 artscot79

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Posted 15 July 2010 - 06:15 PM

I don't think that's correct. Even the recirculated air is still going through the condenser which will be taking the moisture out of it.


recirculation is what it says the air blown into the cabin is recirculated and doesnt go back into the aircon compressor thats why the manuall states that using the recirc buttion will cause the windows to mist up and should only be used for short periods of time the moisture in the air stays until you switch the recirc off and the aircon will then remove that moisture

#5 rog99

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Posted 15 July 2010 - 10:52 PM

recirculation is what it says the air blown into the cabin is recirculated and doesnt go back into the aircon compressor thats why the manuall states that using the recirc buttion will cause the windows to mist up and should only be used for short periods of time the moisture in the air stays until you switch the recirc off and the aircon will then remove that moisture


Sorry artscot79, I agree with mjt.
The aircon evaporator is mounted inside the cabin with the heater matrix so that both outside air and recirculated air will pass through it. [no air goes "back into the aircon compressor" the compressor re-compresses the refrigerant only]

My handbook says "In very humid weather and high external temperatures switch on the air conditioning and the recirculated air.."

I agree that in the ventilation section of the handbook it does say that the car will mist up mote quickly using recirculated air but that is talking about normal ventilation - a few people on a cold day with the heater turned up will soon mist up the windows!

#6 artscot79

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Posted 15 July 2010 - 11:19 PM

Sorry artscot79, I agree with mjt.
The aircon evaporator is mounted inside the cabin with the heater matrix so that both outside air and recirculated air will pass through it. [no air goes "back into the aircon compressor" the compressor re-compresses the refrigerant only]

My handbook says "In very humid weather and high external temperatures switch on the air conditioning and the recirculated air.."

I agree that in the ventilation section of the handbook it does say that the car will mist up mote quickly using recirculated air but that is talking about normal ventilation - a few people on a cold day with the heater turned up will soon mist up the windows!


after having a look it would appear you are correct im used tio the climatronic system that does it for you on that you cant recirc the air as the car keeps the interior at the preset temp constantly

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