A/C on with Defrost

CtryBoyInMT · 03-26-2008, 03:52 PM

So I got bored and wanted to disable the A/C from coming on when I selected the mixed(floor/windshield) and windshield only modes on the environmental selector. It kind of sucks to have the heat on in the middle of the winter only to have the A/C turn on and waste MPH.
So consider this is an Eco-Friendly mod!

After looking at the schematics I found that the green wire from the D3 connector triggered the A/C amplifier to engage the compressor. There is also a separate trigger wire for the manual A/C switch. Bonus!
Here is how it's done:

Locate the D3 connector on the defroster servo and remove it.

Remove the white retainer and insert a small piece of wire to release the SOLID Green #3 wire. Not the Green with Black stripe.

Fold it back for safe keeping and tape it up to prevent shorting.

Then plug it back into the Servo. Don't forget to re-install the white retainer!!

I've tested this for a few days and the A/C will still turn on with the manual A/C button on the environmental control panel.

--------------------
Edit:
There were some questions on how to remove the terminal from the plug (plastic) and I just wanted to clarify for those who have yet to take one part.
After you remove the white retainer, you still need to insert the helper wire, into the inverted 'T' slot below the square slot, to remove the spring loaded clip still holding the terminal to the plug.

Fellow TW member rlg0613 suggested a jewelers screwdriver which I didn't even think of.

I added a diagram to clarify this.

rlg0613 · 03-26-2008, 04:57 PM

Neat mod. It would be nice to be able to bring that green wire out to a dash switch. That would allow the A/C to kick on when it's fogging up due to high humidity in the cabin. I know a lot of times in cold weather the problem is the cold windshield, but there are times (even with the heat on) when the A/C helps. Just my un-scientific opinion.

Bob

CtryBoyInMT · 03-26-2008, 05:20 PM

You still can, have the heat on and the A/C for the dehumidifying.
You just press the A/C button.

tacomaman06 · 03-26-2008, 05:55 PM

nice write up, country boy!! this should be stickied, or put in the cheap mods thread!! good job!!!

Roland · 03-26-2008, 07:18 PM

WOOT! I've been waiting for someone to find a way to do this!
+ to rep for being a genius!

CtryBoyInMT · 03-27-2008, 12:18 AM

If anyone wants to recommend this as a Sticky or added to PT's list, feel free to nominate.
I'm just sharing some helpful things I've found.
I'm just to modest to nominate myself!

rlg0613 · 03-27-2008, 04:39 AM

Quote:

Originally Posted by CtryBoyInMT

You still can, have the heat on and the A/C for the dehumidifying.
You just press the A/C button.

Doh! It was a long day, my brain wasn't in gear...

ETAV8R · 03-27-2008, 06:48 AM

Awesome find. Looks fairly simple to do. I was bummed when toyota first decided to activate A/C when defrost is on. Most defrosters work with heat not a/c. Whats the deal?

nd · 03-27-2008, 09:51 AM

you get some rep for that one ctryboy! too bad i'm afraid to touch the wiring on my truck.... who wants to do it for me?

mvega1969 · 03-27-2008, 10:05 AM

ndcouch, that is not ignorance (compliment) is your way of doing things, lazy boy, easier for you open your windows and that will defrost even your wettest ideas, that is if you have the pw if not burn baby burn, hot and humid.

nd · 03-27-2008, 11:18 AM

Quote:

Originally Posted by mvega1969

ndcouch, that is not ignorance (compliment) is your way of doing things, lazy boy, easier for you open your windows and that will defrost even your wettest ideas, that is if you have the pw if not burn baby burn, hot and humid.

Dan? is that you?

piercedtiger · 03-27-2008, 07:24 PM

Quote:

Originally Posted by tacomaman06

nice write up, country boy!! this should be stickied, or put in the cheap mods thread!! good job!!!

Added to the T.O.C.

carriggjr · 04-08-2008, 09:09 AM

Ok, so what panel did you find the connector behind, and how does it come loose?

CtryBoyInMT · 04-08-2008, 09:53 PM

Quote:

Originally Posted by carriggjr

Ok, so what panel did you find the connector behind, and how does it come loose?

The only thing you need to remove is the glove box. Push in on the two limit stops holding it and lift the box off the hinge. The First picture is taken from the passenger seat looking toward the center of the dash through the opening left from removing the glove box.

Edit: Just about forgot... If you still have that pathetic waste of a shock on the glove box, you need to remove that, too!

gdawg25 · 04-08-2008, 10:02 PM

So you are telling me the AC comes on when I select defrost (windshield)?

CtryBoyInMT · 04-08-2008, 10:31 PM

Quote:

Originally Posted by gdawg25

So you are telling me the AC comes on when I select defrost (windshield)?

If you have Air Conditioning, yes.
When the environmental selector is set to either Floor/Windshield mix or Windshield only, the A/C compressor is triggered. The inlet air runs through the A/C condenser before it is ran through the heater core and delivered to the system.
The engineering thought process behind this layout is to "dry" the incoming air, reducing the fog buildup on the windshield.
In all justification, this process is sometimes needed on humid days when the windshield is cool and the incoming moisture condenses on the windshield (creating fog). Once the windshield is warm enough, this "Drying" is no longer needed. Unfortunately the system cannot detect this and continues to run the A/C system.

We 'Smarter than the average human' Tacoma owners do not need this.

We will immediately recognize this situation, therefore taking the appropriate corrective action and push the A/C button.
Likewise, when no longer needed, we can opt to de-select the A/C function reducing the drag on the engine and increasing power and fuel economy.

gdawg25 · 04-08-2008, 10:36 PM

Hmmm, I did not know this. Good info. However, I don't see why in the hell I would need this. I live in the driest damn place on the face of the earth. What's humidity?

gp4camping · 04-09-2008, 02:17 AM

countryboy, that is very interesting, what is the year of your truck? I'm wondering if this is the same for an 08 tacoma? Anybody done this on an 08?

rlg0613 · 04-09-2008, 04:53 AM

I did my '08 Prerunner about a week ago. It's been pretty rainy here and I have had to turn on the A/C only once and for only about 30 seconds. The front and back windows cleared and I went back to Eco-Friendly driving.

No joke - this is a HP boost mod!

Roland · 04-09-2008, 05:04 AM

Quote:

Originally Posted by gp4camping

countryboy, that is very interesting, what is the year of your truck? I'm wondering if this is the same for an 08 tacoma? Anybody done this on an 08?

It whould be the same on all the second generation trucks.

03-26-2008, 04:57 PM	#2
rlg0613 Patron Prince Joined: Jan 2008, #4343 Location: NC Posts: 7 08 Super White Prerunner SR5 I4 Manual 2008 Access Cab Manual 2.7 I4	Neat mod. It would be nice to be able to bring that green wire out to a dash switch. That would allow the A/C to kick on when it's fogging up due to high humidity in the cabin. I know a lot of times in cold weather the problem is the cold windshield, but there are times (even with the heat on) when the A/C helps. Just my un-scientific opinion. Bob __________________ 2008 Tacoma Access Cab, 4cyl., 5 speed, Super White Prerunner.

03-26-2008, 05:55 PM	#4
tacomaman06 Carolina Alliance: Redneck Division Joined: May 2007, #1475 Location: rock hill, sc Age: 29 Posts: 9,186 04 trd tacoma 4x4 v6 double cab 2004 Double Cab Automatic 3.4 v6 vent visors,deck plate mod, gray wire mod, black steelies and emblems, mag-lite mod, wheelers/ome suspension, stainless brake lines....still to come.... afe pro dry s filter..........plus many,many more!!	nice write up, country boy!! this should be stickied, or put in the cheap mods thread!! good job!!! __________________ i am WILL--my ride=04 tacoma trd 4x4 double cab, v6, auto,deck plate mod, grey wire mod, billy 5100's all the way around,black low-pro uws toolbox, black steelies,blacked out emblems, mag light mod,wheelers/alcan springs, ome 881 coils, braided stainless brake lines, polyurethane bushings,soon to come....15 inch wheelers steelies and gy wrangler mtr's!!! http://s202.photobucket.com/albums/aa269/tacomaman06/ www.myspace.com/goodolboy1979

03-26-2008, 07:18 PM	#5
Roland My other ride has sails Joined: Jan 2008, #4149 Location: Rhode Island Posts: 1,873 06 Impulse Red I4 2WD Access Cab 2006 Access Cab Manual 2.7 UnderCover Tonneau, Bed mat, Bug Deflector, aFe Pro Dry S, Secondary Air Filter removed, Synthetic 5W-30 oil, Scanguage II with blendmount, WeatherTech floorliners, Toyota seat covers, Installed OEM intermittent wipers, TacomaWorld sticker, Defrost without AC mod.	WOOT! I've been waiting for someone to find a way to do this! + to rep for being a genius! __________________ "Life's journeys End is not to arrive at the grave safely in a well preserved body, but rather to skid in sideways, totally worn out, shouting "...holy shit what a ride!"

03-27-2008, 12:18 AM	#6
CtryBoyInMT Senior Member Joined: Nov 2007, #3632 Location: Johnson County, KS Posts: 151 2008 4WD V6 Access Manual TRD Off-Road 2008 Access Cab Manual 4.0L V6 Tinted windows, Rear locker anytime, Secondary filter delete, Parking light activated Fog lights, USA▪Spec Ipod adapter, Map light mod, Relocated 7-Blade, Warn Trans4mer Brushguard & winch, Tire chains, Homelink© installed in headliner, LED lighted 4x4 Switch and Defrost w/o A/C mod.	If anyone wants to recommend this as a Sticky or added to PT's list, feel free to nominate. I'm just sharing some helpful things I've found. I'm just to modest to nominate myself! __________________ Do I get any Horsepower gain from the tailgate hose clamp mod?

03-27-2008, 06:48 AM	#8
ETAV8R 4th Marine Air Wing Joined: Feb 2008, #4832 Location: SoCal Posts: 40 MGM 09 Access Cab 4X V6 TRD OR 2009 Access Cab Automatic	Awesome find. Looks fairly simple to do. I was bummed when toyota first decided to activate A/C when defrost is on. Most defrosters work with heat not a/c. Whats the deal? __________________

03-26-2008, 05:20 PM	#3
CtryBoyInMT Senior Member Joined: Nov 2007, #3632 Location: Johnson County, KS Posts: 151 2008 4WD V6 Access Manual TRD Off-Road 2008 Access Cab Manual 4.0L V6 Tinted windows, Rear locker anytime, Secondary filter delete, Parking light activated Fog lights, USA▪Spec Ipod adapter, Map light mod, Relocated 7-Blade, Warn Trans4mer Brushguard & winch, Tire chains, Homelink© installed in headliner, LED lighted 4x4 Switch and Defrost w/o A/C mod.	You still can, have the heat on and the A/C for the dehumidifying. You just press the A/C button. __________________ Do I get any Horsepower gain from the tailgate hose clamp mod?

03-27-2008, 09:51 AM	#9
nd CA Founder: I'm back bitches!!! Joined: Mar 2007, #1047 Location: Greenville, SC Age: 26 Posts: 6,376 07 TRD Off-Road 4x4 debadged 2007 Double Cab Automatic V6 De badged, 5100's, Black Toyota Baja wheels	you get some rep for that one ctryboy! too bad i'm afraid to touch the wiring on my truck.... who wants to do it for me? __________________ The problem with America is that it's full of people And people are stupid Hence............... democrats

03-27-2008, 10:05 AM	#10
mvega1969 Senior Member Joined: Nov 2007, #3469 Location: Alliance crusher Posts: 407 SILVER 08 TACOMA DC LB 4X4 TRD Sprt Pkg, Side Steps, Frnt Skid Lid, Roof Rack, Bed Extender, Tow Pkg 2008 Double Cab Automatic 4.0	ndcouch, that is not ignorance (compliment) is your way of doing things, lazy boy, easier for you open your windows and that will defrost even your wettest ideas, that is if you have the pw if not burn baby burn, hot and humid. __________________ 08 SILVER STRIKE MICA DC LB 4X4 TRD Sprt Pkg, Side Steps, Front Skid Plate, Roof Rack, Bed Extender, Bed Mat, Bed Rug, Bed Net, All Weather Mats, Tow Pkg, Exhaust Silver Tip, Tail gate Pop&Lock, XPel Headlight Protection Film, XQ 100 Leer Cap -Browning Pkg-, Bed Rug, THULE MOAB Safari Rack. MODS: Belt Chime, DRL, 4x4 Illum Dial, Red Line Hood Struts, Fumoto Valve Power Points: 2 in Bed, 1 Underhood. FOG; All-time on, Yellow Bulbs. LIGHTS: 2 Remote Controlled in camper, Hood Tilt, Hood Corded Reel, 2 Reverse. TACOMAWORLD.COM Sticker.

04-08-2008, 09:09 AM	#13
carriggjr Junior Member Joined: Feb 2008, #4945 Posts: 2 2006 Tacoma TRD 2006 Access Cab Automatic V6	Ok, so what panel did you find the connector behind, and how does it come loose?

04-08-2008, 10:02 PM	#15
gdawg25 Finally in Victoria! Joined: Oct 2006, #136 Location: Victoria, British Columbia Age: 26 Posts: 732 07 TRD Sport 2007 Double Cab Manual 4.0L V6 Airaid Intake, Westin Oval Step Bars, TRD seat covers, LiteRider tonneau cover.	So you are telling me the AC comes on when I select defrost (windshield)? __________________ I piss excellence!

04-08-2008, 10:36 PM	#17
gdawg25 Finally in Victoria! Joined: Oct 2006, #136 Location: Victoria, British Columbia Age: 26 Posts: 732 07 TRD Sport 2007 Double Cab Manual 4.0L V6 Airaid Intake, Westin Oval Step Bars, TRD seat covers, LiteRider tonneau cover.	Hmmm, I did not know this. Good info. However, I don't see why in the hell I would need this. I live in the driest damn place on the face of the earth. What's humidity? __________________ I piss excellence!

04-09-2008, 02:17 AM	#18
gp4camping Junior Member Joined: Apr 2008, #5840 Location: virginia Posts: 18 08 4x4 TRD off-road package 2008 Double Cab Automatic	countryboy, that is very interesting, what is the year of your truck? I'm wondering if this is the same for an 08 tacoma? Anybody done this on an 08?

04-09-2008, 04:53 AM	#19
rlg0613 Patron Prince Joined: Jan 2008, #4343 Location: NC Posts: 7 08 Super White Prerunner SR5 I4 Manual 2008 Access Cab Manual 2.7 I4	I did my '08 Prerunner about a week ago. It's been pretty rainy here and I have had to turn on the A/C only once and for only about 30 seconds. The front and back windows cleared and I went back to Eco-Friendly driving. No joke - this is a HP boost mod! __________________ 2008 Tacoma Access Cab, 4cyl., 5 speed, Super White Prerunner.

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