Air con help

Do any air con systems cut out when the Outside Air Temp reaches less than 4C? Or do they all (or the vast majority) cut out when the evaporator temp drops below 4C, enabling the system to continue to work if it is in re-cyc and the inside of the car has warmed up.


Summary: You most likely can use your air-con in this weather, just put it in re-cyc, turn the air-con on, set the temperature to something hot, then sit back and let it pump moisture out of the car.
 
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the CC in the leon turns off the aircon below either 5C or 3C, i can't remember which though
the only way to turn on the compressor in these temperatures is to hold the aircon button

otherwise it won't turn on below that outside temperature
 
BigglesPiP said:
Do any air con systems cut out when the Outside Air Temp reaches less than 4C? Or do they all (or the vast majority) cut out when the evaporator temp drops below 4C, enabling the system to continue to work if it is in re-cyc and the inside of the car has warmed up.


Summary: You most likely can use your air-con in this weather, just put it in re-cyc, turn the air-con on, set the temperature to something hot, then sit back and let it pump moisture out of the car.
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I'm a little confused by this. The workshop manual for my car sttes you should expect vent temp of 2.5-4.5C. How on earth can that be possible if the evap temp never goes below 4C? I'm also fairly sure models without digital climate don't even have an outdoor temp sensor either.
 
Biggles basically asked what I did :p Mine only has a sensor/'stat attached to the evaporator - I know this because I had to replace it to make the AC work after many hours studying diagrams of the system :(
 
( |-| |2 ][ $;15702512 said:
You and Fox are both right there can be examples of damp in a car other than a leak.
Without getting into a full on argument can I say that the normal blowers should be able to handle that no problem? I've not had any steaming up issues during the cold weather..
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Usually you have to heat the air to allow it to absorb more water, if you dry the air though you get the drying effect straight away.

I have, but the sock of rice is doing wonders.
 
BigglesPiP said:
Do any air con systems cut out when the Outside Air Temp reaches less than 4C? Or do they all (or the vast majority) cut out when the evaporator temp drops below 4C, enabling the system to continue to work if it is in re-cyc and the inside of the car has warmed up.


Summary: You most likely can use your air-con in this weather, just put it in re-cyc, turn the air-con on, set the temperature to something hot, then sit back and let it pump moisture out of the car.
Click to expand...

How does it go out the car when you have it on recirculate?
 
Jonnycoupe said:
The wet air ? when you air restricting natural airflow by having the blower intake taking air from inside the cabin and not outside?
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The moist air doesn't go out the car.

It flows from the in cabin air source, past the cold evaporator. As is passes the evaporator it is cooled and the moisture goes from solution in the air, to condensation on the evaporator which will ultimately go out a drain. The air then goes past the heater matrix, and returns the the cabin as hot dry air.

The heater matrix can't go below zero or the condensation will freeze and block it, so a system will keep it at 4C or more, this is why the air-con won't work on cold air from outside.
 
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