Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - Car models with auto-off A/C??

swoody · 08-09-2009, 08:49 PM

Well that does sound like a nice setup Old Tele Man

If I were to do it to my car, though, I think I'd do it a bit more... 'ghetto'. I'd probably put some kind of physical switch on the pedal itself, and wire it into the A/C button on the HVAC control inside the car. That way when the pedal is released completely, it will trigger the A/C switch to come on. This would also give you a nice indicator as to whether or not it's actually working, since the A/C selector has an LED light on it.

My only concern with this is that on some cars, when you put on the defrost setting, the A/C will come on no matter if you select it or not. If the car in question is setup this way, I believe your suggestion of wiring the switch into the hotline of the A/C compressor would work much better.

I'll admit your plan sounds much more professional, and would probably be the route to go if you wanted to do a good job with it

Edit: Another possible idea for the switch may be modding and using a 'wide open throttle' switch that are used with nitrous kits. One of these modded so the switch is closed when your throttle is completely closed may just do the trick as well. I'm not referring to one that mounts behind the gas pedal, but one that would go on the throttle body.

08-09-2009, 08:49 PM	#3 (permalink)
swoody Certified Duct Tape Tech. Join Date: Feb 2008 Location: Chicago, USA Posts: 76 Slow Ride - '00 Honda Civic DX 90 day: 46.32 mpg (US) Thanks: 0 Thanked 0 Times in 0 Posts	Well that does sound like a nice setup Old Tele Man If I were to do it to my car, though, I think I'd do it a bit more... 'ghetto'. I'd probably put some kind of physical switch on the pedal itself, and wire it into the A/C button on the HVAC control inside the car. That way when the pedal is released completely, it will trigger the A/C switch to come on. This would also give you a nice indicator as to whether or not it's actually working, since the A/C selector has an LED light on it. My only concern with this is that on some cars, when you put on the defrost setting, the A/C will come on no matter if you select it or not. If the car in question is setup this way, I believe your suggestion of wiring the switch into the hotline of the A/C compressor would work much better. I'll admit your plan sounds much more professional, and would probably be the route to go if you wanted to do a good job with it Edit: Another possible idea for the switch may be modding and using a 'wide open throttle' switch that are used with nitrous kits. One of these modded so the switch is closed when your throttle is completely closed may just do the trick as well. I'm not referring to one that mounts behind the gas pedal, but one that would go on the throttle body. __________________ ~ If you don't jump with both feet, you don't move at all ~ 2000 Civic DX :: 52/50 psi :: Free Warmer Air Intake :: Duct Tape Aero "Spare the duct tape, spoil the job." Last edited by swoody; 08-09-2009 at 09:05 PM..