[QUOTE]Originally posted by Lajster
[B]The defrost capabilities of every car I've ever owned has been helped by using the AC.

 

IF YOU NOTE... When you rollover Mr Williams link it points you to the "Outwar" site. I am familiar with this and other such sites as being a big pain in the ass. I would encourage you NOT to click the link but if you want to see what happens you will then want to know how to close the million or so popup windows that will pop up on and on and on....

Use CTRL+ALT+DEL and "End task" one at a time.

I'm just following this jackass around doing my public service.

IMO... not funny Mr Williams.

 

Right you are, I completely missed the clutch relay. Must be old age. I'd blame it on my height but I use that excuse for other inadequacies.

[QUOTE]Originally posted by txst
[B]Thermodynamically, the A/C can ONLY help when the dewpoint in the is above the evaporator temperature (as I said before).

 

This has become a science lesson.

 

[QUOTE]Originally posted by modifry
[B]
OK, so I'm a nit-picker.

 

I think we're protected from low temperature operation... I noticed that the A/C won't cycle below a certain temperature anyway, which might have something to do with pressure by the ideal gas law. (Colder=Less Pressure)

Notice the statement from the shop manual, regarding both a low and high limit on pressure:

"A/C PRESSURE SWITCH

When the refrigerant is below 196 kPa or above 3140 kPa, the A/C pressure switch opens the circuit to the A/C switch and stops the air conditioning to protect the compressor."

 

I was reading the owner's manual for a 2003 Honda Element and it too turns on the AC automatically when in either of the 2 defrost settings. It says in the manual that the A/C will stay on even if you turn the knob away from the defrost modes, like our S's do. The thing I can't figure out is that in the Element manual it says that the AC light won't come on when you got to the defrost modes. How will owners remember if the A/C is on (in the S the light is on to remind you)? If the light is not on, how do you turn the A/C off??

 

Here is a new twist on wiring this, that I think is nicer and more elegant than any previous idea.
Lets disconnect the current A/C switch and wire up whatever it currently connects as this circuit is by default enabled. Then lets run the blue/red A/C clutch enable wire to the existing A/C switch. Now we have a way of using the A/C switch as it should be with nothing extra needed! Maybe this is how it was in earlier years although I think the change is probably in the logic and not the circuitry.

 

I believe the current A/C switch is a momentary switch that operates through the heater logic circuitry. It would only work if the current A/C switch is a click-on, click-off non-momentary type.

 

I thought about that after i posted the message. perhaps to a toggle relay just to trip the wire open/closed would then work.