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Old 03-19-2023, 04:17 PM #31
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You guys may as well be discussing the workings of a nuclear reactor from my perspective, I have a lot to learn, I will say though I didn't know that the air conditioning compressor spins with the heater on.
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Old 03-19-2023, 06:01 PM #32
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Originally Posted by BlueRunner428 View Post
You guys may as well be discussing the workings of a nuclear reactor from my perspective, I have a lot to learn, I will say though I didn't know that the air conditioning compressor spins with the heater on.
BlueRunner428 (Lol),

That feature is there to protect the A/C Compressor from seizure, due to lack of oil circulation during the winter months! BTW: I see you live only a few miles from my home in N.J.; "Howdy neighbor!" LOL!
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Old 03-19-2023, 09:43 PM #33
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BlueRunner428 (Lol),

That feature is there to protect the A/C Compressor from seizure, due to lack of oil circulation during the winter months! BTW: I see you live only a few miles from my home in N.J.; "Howdy neighbor!" LOL!
Yes, I have a blue 4Runner I am in Upstate, NY though, not New Jersey. Why do other vehicles not turn the compressor on unless the AC specifically is turned on?
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Old 03-20-2023, 01:51 AM #34
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Originally Posted by BlueRunner428 View Post
Yes, I have a blue 4Runner I am in Upstate, NY though, not New Jersey. Why do other vehicles not turn the compressor on unless the AC specifically is turned on?
...I believe that nowadays... "They ALL do that!"
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Old 03-20-2023, 04:59 PM #35
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Originally Posted by BlueRunner428 View Post
Yes, I have a blue 4Runner I am in Upstate, NY though, not New Jersey. Why do other vehicles not turn the compressor on unless the AC specifically is turned on?
My understanding is modern vehicles turn the compressor on when defrost is chosen (regardless of temp setting) and some do and some don’t show it to be on via the AC light. This is to dry the air , as you need dry air to remove moisture from the windshield. As a bonus, hot air can hold more water.
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Old 03-20-2023, 06:40 PM #36
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Originally Posted by Bmnorm2 View Post
My understanding is modern vehicles turn the compressor on when defrost is chosen (regardless of temp setting) and some do and some don’t show it to be on via the AC light. This is to dry the air , as you need dry air to remove moisture from the windshield. As a bonus, hot air can hold more water.
Did defrostersin the olden days just operate with more moisture?
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Old 03-20-2023, 07:36 PM #37
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Originally Posted by BlueRunner428 View Post
Did defrostersin the olden days just operate with more moisture?
I suppose I wrote that a little differently than I meant. I assume cars in the olden days also ran compressor when defrost selected, but I’m not sure. I am sure that without it, the air is less dry and less effective at removing moisture from windshield.

My real point was I’ve seen modern vehicles that do not illuminate A/C light in defrost mode, but compressor is certainly on.

Now I’ve made an ass of myself .
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Old 03-20-2023, 11:03 PM #38
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...I love this...LOL,

In the "OLDEN-DAYS", the defrost cycle would direct the return (Cabin-air) through the A/C system's Evaporator coil to remove moisture from the air; drying it out, BEFORE... sending it through the the Heater-core to be warmed back up! That's the way I remember vehicles from when I worked as an auto-tech back in the day!

~rig~ Best regards!
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Old 03-20-2023, 11:05 PM #39
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Originally Posted by Bmnorm2 View Post
I suppose I wrote that a little differently than I meant. I assume cars in the olden days also ran compressor when defrost selected, but I’m not sure. I am sure that without it, the air is less dry and less effective at removing moisture from windshield.

My real point was I’ve seen modern vehicles that do not illuminate A/C light in defrost mode, but compressor is certainly on.

Now I’ve made an ass of myself .
My 1998 GMC Jimmy never turned on the A/C light for the defroster.
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Old 03-22-2023, 12:42 AM #40
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Originally Posted by rigtec View Post
...I love this...LOL,

In the "OLDEN-DAYS", the defrost cycle would direct the return (Cabin-air) through the A/C system's Evaporator coil to remove moisture from the air; drying it out, BEFORE... sending it through the the Heater-core to be warmed back up! That's the way I remember vehicles from when I worked as an auto-tech back in the day!

~rig~ Best regards!
I think it only did that in the de-ice mode.
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Old 04-01-2023, 03:04 PM #41
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Originally Posted by AMLOR View Post
Well, sort of.... the 270A alternator is on my list of cool stuff to do to the 4R, but not as of yet.
Currently running the "GM diode" trick on my 2019 with acceptable results.
Output is 14.2-14.5v on cold startup. That said I DO believe this mod shortened the life of my Optima Red start battery.
All other auxiliary power needs are routed through a RedArc BCDC 1225 that manages the AGM auxiliary battery at 13.2-13.5V.
@lewdog998 and @DCPower_Anthony may have worked out how to put a DC Power Inc 270A into 2018-2021 (at least) vehicles. See the thread at High Power Alternator install
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Old 04-02-2023, 03:11 AM #42
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Originally Posted by BlueRunner428 View Post
Did defrostersin the olden days just operate with more moisture?
In the real olden days there was no a/c so you defrosted with humid hot air, it just took a bit longer to clear most of the windows
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