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Old 04-09-2008, 03:38 PM   #21
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Quote:
Originally Posted by CtryBoyInMT View Post
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............................ :
Thanks Ctryboy, exactly what I was looking for.
I think it also stops the automatic "recirculate" from happening.
Good job.....Larry
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Old 04-14-2008, 11:41 AM   #22
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Thanks CBIM

Works great for me too!
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Old 04-19-2008, 11:48 AM   #23
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I just finished this mod, I'll be test driving it later. While I had the glove box out I cleaned the cabin air filter. It's amazing how much stuff it had in it after only 16K miles.
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Old 04-21-2008, 09:43 PM   #24
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Good news guys! My last tank of gas, I left my defrost off and I got 18.5mpg. That's a new record for me. My previous record was 17mpg.
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Old 04-22-2008, 07:08 AM   #25
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Quote:
Originally Posted by gdawg25 View Post
Good news guys! My last tank of gas, I left my defrost off and I got 18.5mpg. That's a new record for me. My previous record was 17mpg.
Get an AFE Pro Dry filter! I'm up to 20mpg/tank from 17-18mpg/tank! Removing the secondary air filter might help too, but that came off a long time ago so.....
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Old 04-22-2008, 11:17 AM   #26
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Quote:
Originally Posted by piercedtiger View Post
Get an AFE Pro Dry filter! I'm up to 20mpg/tank from 17-18mpg/tank! Removing the secondary air filter might help too, but that came off a long time ago so.....
I already removed the secondary filter. Now I just need to remove my lead foot.
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Old 04-22-2008, 07:42 PM   #27
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Thanks CtryBoyInMT, works great for me. I went lazy and just cut the wire 2 inchs from the connector and heat shrinked both end of the wire. If need be I'll splice the wire back together...I just don't see the need.
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Old 04-22-2008, 09:12 PM   #28
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thanks, far the easiest of all mod to date
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Old 07-13-2008, 06:16 AM   #29
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I have been told that the AC compressor does not lower your MPG. I'm getting a little over 19 MPG combined driving with the AC on / summer driving. Earlier in the spring less AC needed...my MPG was never higher than that.

MPG varies so this is not a scientific test but more of an observation. However...like I was told that some test(s) have been done and verifies my observation.

Dunno....
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Old 07-13-2008, 08:44 AM   #30
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The rule of thumb it that over 40 MPH it's more efficient to drive with the AC on and the windows up verses having the windows open. At less than 40 the AC puts more drag on the engine than the resistance of having the windows down. If you're just driving around town you'll get higher MPGs if you can turn off the AC and be comfortable enough with the windows open.

At all speeds it's most efficient to have the windows up and the AC off.
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Old 07-13-2008, 11:08 AM   #31
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Quote:
Originally Posted by Roland View Post
At all speeds it's most efficient to have the windows up and the AC off.
I see we have a rocket scientist in the house!!
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Old 07-13-2008, 05:45 PM   #32
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Quote:
Originally Posted by CtryBoyInMT View Post
I see we have a rocket scientist in the house!!
Or someone that caught that episode of Mythbusters....
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Old 07-13-2008, 06:57 PM   #33
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I missed any episode of Mythbusters that had to do with automotive AC.
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Old 07-13-2008, 09:59 PM   #34
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Quote:
Originally Posted by budisit View Post
I have been told that the AC compressor does not lower your MPG. I'm getting a little over 19 MPG combined driving with the AC on / summer driving. Earlier in the spring less AC needed...my MPG was never higher than that.

MPG varies so this is not a scientific test but more of an observation. However...like I was told that some test(s) have been done and verifies my observation.

Dunno....

You can feel the truck lug down when the AC compressor comes on. There is no question of losing power and mpg with AC on. But yes, still do it at highway speeds vs rolling down the windows. This darn defroster this is something that Toyota is proud of. The window sales sticker calls it 'AC linked defroster'. No thank you. It may be why so many of us get mpg less than we should.
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Old 07-14-2008, 06:55 AM   #35
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Quote:
Originally Posted by mainerinexile View Post
You can feel the truck lug down when the AC compressor comes on. There is no question of losing power and mpg with AC on. But yes, still do it at highway speeds vs rolling down the windows. This darn defroster this is something that Toyota is proud of. The window sales sticker calls it 'AC linked defroster'. No thank you. It may be why so many of us get mpg less than we should.
It's been like that for years. My 98 Corolla turned on the AC when I switched to full windshield. Sure helps clear the fog off on a hot, humid night or day. Nice thing about the car though was that it was ONLY the windshield-only setting and not windshield/feet and windshield-only like the truck. I could stil do windshield/feet in the car during winter months without the AC coming on and making it take even longer to warm up. But since this feature is 10 years old I've learned to live with it. Truck rarely leaves the vertical "feet only" position since that directs air to almost all the other vents anyway (windshield, feet, and front side ones). Warms/cools the entire cab better than the other settings AND clears the windshield.
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Old 07-14-2008, 09:44 AM   #36
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i done mine and broke the green wire off in the socket but it works just taped it back to it self
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Old 07-14-2008, 09:56 AM   #37
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Quote:
Originally Posted by Roland View Post
The rule of thumb it that over 40 MPH it's more efficient to drive with the AC on and the windows up verses having the windows open. At less than 40 the AC puts more drag on the engine than the resistance of having the windows down. If you're just driving around town you'll get higher MPGs if you can turn off the AC and be comfortable enough with the windows open.

At all speeds it's most efficient to have the windows up and the AC off.
all the way down? or just part way down. Just part way down...or cracked is way more efficient than ac on.

I',m 1-2 mpg worse with the ac on. I also need to do the mod to correct this toyota thing, but it seems like a hard mod and and scares me..enough of my rant on the subject..its sucks!!
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Old 07-14-2008, 10:44 AM   #38
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Quote:
Originally Posted by wiscdave View Post
all the way down? or just part way down. Just part way down...or cracked is way more efficient than ac on.

I',m 1-2 mpg worse with the ac on. I also need to do the mod to correct this toyota thing, but it seems like a hard mod and and scares me..enough of my rant on the subject..its sucks!!
The lower the windows the more resistance.

The mod was easy, easier than it looked in fact. Just follow the walk thru and look at the pictures. The toughest part was getting the wire out of the connecter. I was really tempted to just cut the wire and tape the end but that would have made it a bit more work to undo the mod (Not that I'm likely to).
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Old 07-15-2008, 09:50 AM   #39
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Quote:
Originally Posted by ETAV8R View Post
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?
My parents had a '70 Dodge Coronet 440 that the A/C turned on with the defrost - I live in the Houston area - KING of HUMIDITY!
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Old 07-29-2008, 05:41 PM   #40
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Quote:
Originally Posted by CtryBoyInMT View Post
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.
This is good to know for when I get my Tacoma. I seem to recall seeing the "A/C Linked Defrost" on the sticker when I was browsing around at the dealer, but didn't really give a second thought about what that meant. Seems like a stupid feature to me, but then I'm one of those guys who hates letting computers make decisions for me.... I'm quite capable of cracking a window or turning on the A/C if it gets too foggy, thank you. My vents are always set to either windshield, floor, or both (Not too fond of having the front vents blowing towards me). This mod should save me a buck or two. Thanks.
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