So do a lot of other underpowered cars, like new Corvettes. I think it's pretty common.quote:
Originally posted by eljefino:
Floor the gas (most 4 bangers) and the A/C clutch cuts out for max acelleration. That, you should feel.
So do a lot of other underpowered cars, like new Corvettes. I think it's pretty common.quote:
Originally posted by eljefino:
Floor the gas (most 4 bangers) and the A/C clutch cuts out for max acelleration. That, you should feel.
Of course however a little sweating of the evap coil doesn't hurt the system and helps prevent coil freeze up in some systems.quote:
Originally posted by brianl703:
I can tell you that the more humidity in the air, the less efficiently the evaporator can cool it, and the warmer the air coming out of it.quote:
Originally posted by Alan:
The evaporator works off the humidity in the air.
You can try an experiment. While driving down the road, turn you a/c on, to circulate throught the cabin, and on recycle. Now, reset it to defrost the windows, and watch the recycle light go out. That makes Alan's statement true, if it happens in your car, too. Don't trust Alan, experiment, Alan could be trying to pull a fast one on you. After all, you must never trust an Engineer.quote:
Originally posted by Alan:
Ever notice on most cars when you put on the defrost it automatically goes to outside air to remove humidity in side the vehicle?
How did you make this observation? How do you know it moved to outside air?
I see what your saying however just that small and quick reintroduction of some humidity to the loop can help with the feeling the A/C "working".quote:
Originally posted by brianl703:
The reason that defrost pulls in outside air is because of winter.
In winter, the air inside the car is likely to be much more humid than the air outside the car. If defrost didn't pull outside air in, it wouldn't work very well and the windows would continue to steam up. (It would be too cold outside for the AC to work, so no dehumidification would take place). You can see this effect on cars that don't automatically turn off recirculate when you select defrost.
In summer, it makes no real difference that I've seen, and in fact when it is raining out and I am getting condensation on the windows, I turn on MAX AC (aka recirc) for the energy savings and that does a fine job of clearing it off, although sometimes I do have to turn it on DEFROST for a couple of seconds to get the process started simply because MAX AC doesn't blow out of the defroster outlets.
Coil freeze up? That doesn't happen on properly designed, properly charged AC systems, regardless of humidity. Now if you're using a residential central AC system to cool your data center in winter, then yes, coil freeze up is a problem but there is a fix.
My understanding is that most car AC systems are set up to keep the evaporator coil temperature just above freezing. Given that, I fail to understand how introducing humidity would either prevent coil freeze-up or increase cooling. It doesn't for home AC units--it in fact decreases cooling on those. Car units I expect would be the same.
1. Possibly from a higher airflow rate on recirculate.quote:
Originally posted by bulwnkl:
When simple logic is contradicted by observed fact, something may need to be reevaluated.
I did not say anything about humidity. Can you think of a simple reason for a temperature difference between fresh and recirculate? I can think of a very simple one