You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!
If you have any problems with the registration process or your account login, please contact contact us.
TacomaGeneral discussion forum for the 2005 and later Toyota Tacoma.
This is a discussion thread titled "Defroster-linked Air Conditioning", within the Tacoma forum, part of the Truck Forums category.
I agree, I was pretty shocked to see that the v-6 requires the plugs to be changed at 30,000 mile intervals. I thought ALL vehicles pretty much went 100,000 + before needing a "tune up."
Another thing about the ECU programming, on Honda's when the throttle is fully closed, and the rpm's are above approx 1,000 (can't remember the actual number but it's close) the injectors shut completely off. So if you keep it in gear as you slow down, you are using no fuel to travel that slowing down distance. I know for a fact that the Tacoma doesn't work that way. it's also crazy that if you push in the clutch the revs will drop down to like 1,200 or so, and stay there for a bit until it decides to drop down to idle. The only way to counter act this is to keep it in gear until it falls to idle, then put in the clutch and the rpm's will stay there. It's reallly bizzare, and maybe it is the surging issue that the auto trans people are experiencing. ONly difference is that in a manual, the clutch is in so the revs staying there don't have any affect on it.
I'm already completely disappointed that Toyota uses Delco for the HVAC system as it is. My grandmom just called me telling me that her 01 Buick Century will not blow hot air from the defroster, only from the vent settings. I guess with time we will see if having Toyota set the specs on the sytem might have made it more reliable, but I have my doubts.
Another Delco story, my mom has a 98 Accord, only thing in it that is Delco is the alternator, so guess what went at around 70,000 miles? Yep the Alternator. I had a 93 which had a Denso unit and I sold the car with 364,000 miles on it with the original alternator. Delco is crap. And has no place in any Toyota or Honda, or any car for that matter.
IMO, it's not worth disabling the AC when in defrost mode. I don't know about others, but I rarely run on defrost all the time anyway. Might have to run it for the first 10 or 15 minutes, then switch over to vent or floor/vent mode. I live in Seattle, and the times I need it the most is when I've been out in the rain and get in the truck all wet ... need to get all that moisture out of the interior, and having the AC on helps do that.
It's not going to make any difference in gas mileage if used for short periods. Besides, I do agree that it's good to run the AC compressor on a regular basis to keep the system healthy.
Here was a post I made in the old thread about the A/C coming on in the defrost modes. Note the last part of the post where I talk about maybe hearing something going on in the air ducting when the A/C button is pressed while in defrost mode.
The main reason for the compressor coming on during defrost mode is to dehumidify the cabin. It provides optimal heating and reduces fogging on the cold windshield due to condensation. If you really wanted to bypass it there is also a thread that talks about disconnecting the microswitch in the selector knob that engages the compressor when your a/c selector knob is placed in a defrost position.
__________________
2008 Tundra Double Cab Nautical Blue 4.7L
I once drove a rental car into the Hudson, just to practice escaping.
The main reason for the compressor coming on during defrost mode is to dehumidify the cabin. It provides optimal heating and reduces fogging on the cold windshield due to condensation.
The function of A/C is for cabin cooling and the byproduct is dehumidifying. Heating is provided by heater core.
The function of A/C is for cabin cooling and the byproduct is dehumidifying. Heating is provided by heater core.
That's why I said "during defrosting". Not that the compressor provides heat, but that it de-humidifies the air so the heater works better. Maybe I wasn't very clear. I don't want to confuse anyone.
__________________
2008 Tundra Double Cab Nautical Blue 4.7L
I once drove a rental car into the Hudson, just to practice escaping.
That's why I said "during defrosting". Not that the compressor provides heat, but that it de-humidifies the air so the heater works better. Maybe I wasn't very clear. I don't want to confuse anyone.
__________________
"It's not what you know. It's knowing where to find the answer."
'05 4x4 DC LB SR5 Tow Pkg BFG All-Terrain T/A KO, Leer Tonneau, Westin Platinum Nerf Bars, Fog Light Mod, Orig. Owner 12/3/04
PERFECT!!! Exaclty what I wanted, not only does it stop the A/C from automatically coming on when you select def and def/floor, it also allows you to use the recirc button in either of those settings. I do notice that these trucks seem to fog up a lot easier than a car, guess it's the lack of a flow through ventilation system. A car has an outlet in the trunk of the vehicle with a flap that only allows the air to come out ( to prevent carbon monoxide from the exhaust from coming in) I guess in a truck it's hard to do that.
PERFECT!!! Exaclty what I wanted, not only does it stop the A/C from automatically coming on when you select def and def/floor, it also allows you to use the recirc button in either of those settings.
PERFECT!!! Exaclty what I wanted, not only does it stop the A/C from automatically coming on when you select def and def/floor, it also allows you to use the recirc button in either of those settings. I do notice that these trucks seem to fog up a lot easier than a car, guess it's the lack of a flow through ventilation system. A car has an outlet in the trunk of the vehicle with a flap that only allows the air to come out ( to prevent carbon monoxide from the exhaust from coming in) I guess in a truck it's hard to do that.
Not at all, just open the sliding rear window and feel the flow-through goodness.
__________________ '08 Super White Regular Cab 4WD Tacoma
PERFECT!!! I do notice that these trucks seem to fog up a lot easier than a car, guess it's the lack of a flow through ventilation system. A car has an outlet in the trunk of the vehicle with a flap that only allows the air to come out ( to prevent carbon monoxide from the exhaust from coming in) I guess in a truck it's hard to do that.
-----------------------------------------------------------------
The Tacoma's have just that, the vents behind the cab; to test: start truck and turn on any setting other than recirc and close all windows and doors and place hand between cab back and front of bed and feel the air exhausting, now crack 1 window about half an inch and see that quite a bit of air exits there also (path of least resistance). Now close window, set on a recirc position and repeat procedure and there will be no, or very little air exhausting the cab. The cabs fog up more than a car due to somewhat less interior volume than some cars, and the fact that if the humidity is high enough the compressor needs to be running anyway. Some people seem to think that the A/C just draws such an extreme amount of power that it should be saved for some special occasion, but in reality it does not use that much power, and in cool whether the head pressure is low and unit cycles more often. My compressor switch is on all the time except for times when it is dry enough to have static electricity. just set it and forget it except for an occasional fan speed change and bumping the temp up or down a little. Of course if you live somewhere less humid than the south, sometimes the windows down are nice once in a while, but I have never understood the almost fear of having the compressor running, especially when some go to lots of trouble to tint the windows to there perfect specs, install lots of additional sound deadening material, only to ride around in 85º temps with the windows open, having to shout over all the wind noise to be heard and understood. You paid for a good blend air type HVAC system, don't be afraid to use it to it's maximum potential.
All I know is that this truck has way less flow through, if you put the fan on high with the windows closed and not on recirc, you feel like you've just gone up in an airplane. Your ears feel the pressure. And as far as using the HVAC system I paid for, given that Delphi (GM JUNK) is in my Toyota, I'd rather use it as infrequently as possible.
My mom had a 98 Accord, the alternator went at 70,000 miles, guess whose name was on that?? That's right Delphi. I had a 93 Accord and it's alternator was a Denso unit, it lasted the life of the car (sold it with 365,000 miles on it). Unfortunately that NUMMI plant being a joint venture with GM has hurt Toyota given they actually used Delphi for the HVAC system.
TundraSolutions.com is a registered trademark of Tundra Solutions, Inc.
Other trademarks and brands are the property of their respective owners. Use of this Web site constitutes acceptance of the TundraSolutions.com User Agreement and Privacy Policy.
Re: Defroster-linked Air Conditioning
'08 Super White Regular Cab 4WD Tacoma
Linear Mode
