AC compressor runs all the time?

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Old 28 Jul 2012, 09:56 am   #1 (permalink)
micky
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Default AC compressor runs all the time?

In my home AC, when the desired temp is reached, the AC compressor
turns off, and the house air circulation fan will continue running if
it is set to On instead of Auto at the thermostat.

In automobile AC, I have been under the impression that the compressor
runs all the time when the AC is on, even if the car is cool enough
inside. (And the fan runs all the time too.)

And that with automatic automobile AC, the only thing that varies when
the car reaches its desired temperature is that the blend door moves
away from cooled air to warmed air.

Which means that part of the time I am routing engine heat to the
passenger compartment to warm the air that the AC makes too cool to
put into the pass. comp. without warm air to make it less cool.

What a waste of money that would be!

Am I right?

Thanks.
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Old 28 Jul 2012, 11:53 am   #2 (permalink)
bob urz
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Default Re: AC compressor runs all the time?

On 7/28/2012 9:56 AM, micky wrote:
> In my home AC, when the desired temp is reached, the AC compressor
> turns off, and the house air circulation fan will continue running if
> it is set to On instead of Auto at the thermostat.
>
> In automobile AC, I have been under the impression that the compressor
> runs all the time when the AC is on, even if the car is cool enough
> inside. (And the fan runs all the time too.)
>
> And that with automatic automobile AC, the only thing that varies when
> the car reaches its desired temperature is that the blend door moves
> away from cooled air to warmed air.
>
> Which means that part of the time I am routing engine heat to the
> passenger compartment to warm the air that the AC makes too cool to
> put into the pass. comp. without warm air to make it less cool.
>
> What a waste of money that would be!
>
> Am I right?
>
> Thanks.


The waste of money is when you spent the extra bucks to get the
automatic climate control that does it...

The unit will cycle on and off if the pressure is too high or too low.

bob
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Old 28 Jul 2012, 12:18 pm   #3 (permalink)
Paul in Houston TX
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Default Re: AC compressor runs all the time?

micky wrote:
> In my home AC, when the desired temp is reached, the AC compressor
> turns off, and the house air circulation fan will continue running if
> it is set to On instead of Auto at the thermostat.
>
> In automobile AC, I have been under the impression that the compressor
> runs all the time when the AC is on, even if the car is cool enough
> inside. (And the fan runs all the time too.)
>
> And that with automatic automobile AC, the only thing that varies when
> the car reaches its desired temperature is that the blend door moves
> away from cooled air to warmed air.
>
> Which means that part of the time I am routing engine heat to the
> passenger compartment to warm the air that the AC makes too cool to
> put into the pass. comp. without warm air to make it less cool.
>
> What a waste of money that would be!
>
> Am I right?
>
> Thanks.


Using full auto, the compressor will run most of the
time unless its below about 43F ambient.
IMO, its a waste of money and fuel.
With many cars you can turn off Auto.
Foreign made cars tend to have a switch to turn the
compressor on and off with out disturbing the rest
of the settings. American cars do not have that.
We like to use lots of gasoline.
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Old 28 Jul 2012, 08:29 pm   #4 (permalink)
Steve W.
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Default Re: AC compressor runs all the time?

micky wrote:
> In my home AC, when the desired temp is reached, the AC compressor
> turns off, and the house air circulation fan will continue running if
> it is set to On instead of Auto at the thermostat.
>
> In automobile AC, I have been under the impression that the compressor
> runs all the time when the AC is on, even if the car is cool enough
> inside. (And the fan runs all the time too.)
>
> And that with automatic automobile AC, the only thing that varies when
> the car reaches its desired temperature is that the blend door moves
> away from cooled air to warmed air.
>
> Which means that part of the time I am routing engine heat to the
> passenger compartment to warm the air that the AC makes too cool to
> put into the pass. comp. without warm air to make it less cool.
>
> What a waste of money that would be!
>
> Am I right?
>
> Thanks.


Depends on the car and the design of the system. Many cycle the
compressor based on pressure in the system and exterior temperatures.
Others cycle heat/cold to achieve the desired interior temp.

--
Steve W.
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Old 11 Aug 2012, 05:44 pm   #5 (permalink)
micky
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Default Re: AC compressor runs all the time?

On Sat, 28 Jul 2012 11:53:55 -0500, bob urz <sound@inetnebr.com>
wrote:

>On 7/28/2012 9:56 AM, micky wrote:
>> In my home AC, when the desired temp is reached, the AC compressor
>> turns off, and the house air circulation fan will continue running if
>> it is set to On instead of Auto at the thermostat.
>>
>> In automobile AC, I have been under the impression that the compressor
>> runs all the time when the AC is on, even if the car is cool enough
>> inside. (And the fan runs all the time too.)
>>
>> And that with automatic automobile AC, the only thing that varies when
>> the car reaches its desired temperature is that the blend door moves
>> away from cooled air to warmed air.
>>
>> Which means that part of the time I am routing engine heat to the
>> passenger compartment to warm the air that the AC makes too cool to
>> put into the pass. comp. without warm air to make it less cool.
>>
>> What a waste of money that would be!
>>
>> Am I right?
>>
>> Thanks.

>
>The waste of money is when you spent the extra bucks to get the
>automatic climate control that does it...


I didn't want to buy an automatic AC but I didn't have any choice.

I only had two possibilities when my car blew its engine near
Asheville NC, and they both required driving 100 miles to see them. .
>
>The unit will cycle on and off if the pressure is too high or too low.
>
>bob


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Old 11 Aug 2012, 05:53 pm   #6 (permalink)
Vic Smith
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Default Re: AC compressor runs all the time?

On Sat, 11 Aug 2012 18:44:48 -0400, micky <NONONOmisc07@bigfoot.com>
wrote:

>On Sat, 28 Jul 2012 11:53:55 -0500, bob urz <sound@inetnebr.com>
>wrote:
>
>>On 7/28/2012 9:56 AM, micky wrote:
>>> In my home AC, when the desired temp is reached, the AC compressor
>>> turns off, and the house air circulation fan will continue running if
>>> it is set to On instead of Auto at the thermostat.
>>>
>>> In automobile AC, I have been under the impression that the compressor
>>> runs all the time when the AC is on, even if the car is cool enough
>>> inside. (And the fan runs all the time too.)
>>>
>>> And that with automatic automobile AC, the only thing that varies when
>>> the car reaches its desired temperature is that the blend door moves
>>> away from cooled air to warmed air.
>>>
>>> Which means that part of the time I am routing engine heat to the
>>> passenger compartment to warm the air that the AC makes too cool to
>>> put into the pass. comp. without warm air to make it less cool.
>>>
>>> What a waste of money that would be!
>>>
>>> Am I right?
>>>
>>> Thanks.

>>
>>The waste of money is when you spent the extra bucks to get the
>>automatic climate control that does it...

>
>I didn't want to buy an automatic AC but I didn't have any choice.
>
>I only had two possibilities when my car blew its engine near
>Asheville NC, and they both required driving 100 miles to see them. .
>>
>>The unit will cycle on and off if the pressure is too high or too low.
>>
>>bob


Somebody who knows your car can probably show you how to disable the
A/C compressor if you think it's costing you too much in "efficiency."
Maybe.
I used to pull the plug on my GM compressors in the fall, because I
didn't want it kicking on when using defrost mode in the winter.
Didn't need it.

--
Vic
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Old 12 Aug 2012, 06:52 pm   #7 (permalink)
micky
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Default Re: AC compressor runs all the time?

On Sat, 11 Aug 2012 17:53:45 -0500, Vic Smith
<thismailautodeleted@comcast.net> wrote:

>On Sat, 11 Aug 2012 18:44:48 -0400, micky <NONONOmisc07@bigfoot.com>
>wrote:
>
>>On Sat, 28 Jul 2012 11:53:55 -0500, bob urz <sound@inetnebr.com>
>>wrote:
>>
>>>On 7/28/2012 9:56 AM, micky wrote:
>>>> In my home AC, when the desired temp is reached, the AC compressor
>>>> turns off, and the house air circulation fan will continue running if
>>>> it is set to On instead of Auto at the thermostat.
>>>>
>>>> In automobile AC, I have been under the impression that the compressor
>>>> runs all the time when the AC is on, even if the car is cool enough
>>>> inside. (And the fan runs all the time too.)
>>>>
>>>> And that with automatic automobile AC, the only thing that varies when
>>>> the car reaches its desired temperature is that the blend door moves
>>>> away from cooled air to warmed air.
>>>>
>>>> Which means that part of the time I am routing engine heat to the
>>>> passenger compartment to warm the air that the AC makes too cool to
>>>> put into the pass. comp. without warm air to make it less cool.
>>>>
>>>> What a waste of money that would be!
>>>>
>>>> Am I right?
>>>>
>>>> Thanks.
>>>
>>>The waste of money is when you spent the extra bucks to get the
>>>automatic climate control that does it...

>>
>>I didn't want to buy an automatic AC but I didn't have any choice.
>>
>>I only had two possibilities when my car blew its engine near
>>Asheville NC, and they both required driving 100 miles to see them. .


And for that matter, when one buys a high end model with a lot of
accessories, he's likely to get automatic heater/AC. I don't know
why that didn't happen with the 3 Lebarons, '84', '88, and '95. For
'65 and '67 (the year they were made, not the year I bought them) I
had Catalinas when the higher priced models were Bonnevilles. .

Unless one has the car made to order, but I usually buy cars 7 years
old. This time it was 11 years old. Can't get those made to order.

>>>
>>>The unit will cycle on and off if the pressure is too high or too low.
>>>
>>>bob

>
>Somebody who knows your car can probably show you how to disable the
>A/C compressor if you think it's costing you too much in "efficiency."


I like having AC, even when the weather was cooler and I only used it
5 or 10 days in the year, , but I don't like how difficult it is to
control it, and the heat as well. With manual heat/AC, one moves the
temp lever and the output air changes temperature almost immediately,
in the time in the takes the air to get from the blend door to the
output vents, 2 or 3 seconds. With automatic, I change the temp and
it seems to think about it, or it has a plan to gradually bring the
cabin air temp to the temp I set it at.,

(I would think it would maks the air very cold or hot to quickly bring
the average cabin air temp to what I set it to, and later it would
back off the temp of the output air to match the set temp. But I
haven't seen any evidence of this.)

On a previous GM car when I didn't want the AC running just because I
had the defroster on (I don't care if it sometimes defrosts more
quickly that way) I put in a switch to turn it off absolutely, until I
wanted to turn it on.

Then, with my 3 Chrysler Lebarons, it had such a switch already, from
the factory.

I haven't checked out this part of the wiring diagram yet, but
unfortunately, rather than an on/off toggle switch, , the AC is turned
on and off by a momentary switch, either the AC button or the Defrost
button. so I probably can't put in an absolute switch like I did in
the GM car and like the Chrysler cars came with. Well, except by
running a pair of wires all the way from the AC clutch to the
dashboard. So it looks like every time I turn on the Defrost,
I'll have to manually turn off the AC. But this is just about
turning the AC off and that's not my big problem, it's the inability
to directly control the vent air temperature.

>Maybe.
>I used to pull the plug on my GM compressors in the fall, because I


Well, that's a very good idea. At least It will take care of 8
months.

>didn't want it kicking on when using defrost mode in the winter.
>Didn't need it.


Exactly.
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Old 13 Aug 2012, 12:31 am   #8 (permalink)
Sharx35
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Default Re: AC compressor runs all the time?



"micky" <NONONOmisc07@bigfoot.com> wrote in message
news:hjrf28hnh0iklkfpk9hfh09fhp3cjgh50m@4ax.com...
> On Sat, 11 Aug 2012 17:53:45 -0500, Vic Smith
> <thismailautodeleted@comcast.net> wrote:
>
>>On Sat, 11 Aug 2012 18:44:48 -0400, micky
>><NONONOmisc07@bigfoot.com>
>>wrote:
>>
>>>On Sat, 28 Jul 2012 11:53:55 -0500, bob urz <sound@inetnebr.com>
>>>wrote:
>>>
>>>>On 7/28/2012 9:56 AM, micky wrote:
>>>>> In my home AC, when the desired temp is reached, the AC
>>>>> compressor
>>>>> turns off, and the house air circulation fan will continue
>>>>> running if
>>>>> it is set to On instead of Auto at the thermostat.
>>>>>
>>>>> In automobile AC, I have been under the impression that the
>>>>> compressor
>>>>> runs all the time when the AC is on, even if the car is cool
>>>>> enough
>>>>> inside. (And the fan runs all the time too.)
>>>>>
>>>>> And that with automatic automobile AC, the only thing that
>>>>> varies when
>>>>> the car reaches its desired temperature is that the blend
>>>>> door moves
>>>>> away from cooled air to warmed air.
>>>>>
>>>>> Which means that part of the time I am routing engine heat to
>>>>> the
>>>>> passenger compartment to warm the air that the AC makes too
>>>>> cool to
>>>>> put into the pass. comp. without warm air to make it less
>>>>> cool.
>>>>>
>>>>> What a waste of money that would be!
>>>>>
>>>>> Am I right?
>>>>>
>>>>> Thanks.
>>>>
>>>>The waste of money is when you spent the extra bucks to get the
>>>>automatic climate control that does it...
>>>
>>>I didn't want to buy an automatic AC but I didn't have any
>>>choice.
>>>
>>>I only had two possibilities when my car blew its engine near
>>>Asheville NC, and they both required driving 100 miles to see
>>>them. .

>
> And for that matter, when one buys a high end model with a lot of
> accessories, he's likely to get automatic heater/AC. I don't
> know
> why that didn't happen with the 3 Lebarons, '84', '88, and '95.
> For
> '65 and '67 (the year they were made, not the year I bought them)
> I
> had Catalinas when the higher priced models were Bonnevilles. .
>
> Unless one has the car made to order, but I usually buy cars 7
> years
> old. This time it was 11 years old. Can't get those made to
> order.
>
>>>>
>>>>The unit will cycle on and off if the pressure is too high or
>>>>too low.
>>>>
>>>>bob

>>
>>Somebody who knows your car can probably show you how to disable
>>the
>>A/C compressor if you think it's costing you too much in
>>"efficiency."

>
> I like having AC, even when the weather was cooler and I only
> used it
> 5 or 10 days in the year, , but I don't like how difficult it is
> to
> control it, and the heat as well. With manual heat/AC, one
> moves the
> temp lever and the output air changes temperature almost
> immediately,
> in the time in the takes the air to get from the blend door to
> the
> output vents, 2 or 3 seconds. With automatic, I change the temp
> and
> it seems to think about it, or it has a plan to gradually bring
> the
> cabin air temp to the temp I set it at.,
>
> (I would think it would maks the air very cold or hot to quickly
> bring
> the average cabin air temp to what I set it to, and later it
> would
> back off the temp of the output air to match the set temp. But I
> haven't seen any evidence of this.)
>
> On a previous GM car when I didn't want the AC running just
> because I
> had the defroster on (I don't care if it sometimes defrosts more
> quickly that way) I put in a switch to turn it off absolutely,
> until I
> wanted to turn it on.
>
> Then, with my 3 Chrysler Lebarons, it had such a switch already,
> from
> the factory.
>
> I haven't checked out this part of the wiring diagram yet, but
> unfortunately, rather than an on/off toggle switch, , the AC is
> turned
> on and off by a momentary switch, either the AC button or the
> Defrost
> button. so I probably can't put in an absolute switch like I did
> in
> the GM car and like the Chrysler cars came with. Well, except
> by
> running a pair of wires all the way from the AC clutch to the
> dashboard. So it looks like every time I turn on the
> Defrost,
> I'll have to manually turn off the AC. But this is just about
> turning the AC off and that's not my big problem, it's the
> inability
> to directly control the vent air temperature.
>
>>Maybe.
>>I used to pull the plug on my GM compressors in the fall, because
>>I

>
> Well, that's a very good idea. At least It will take care of 8
> months.
>
>>didn't want it kicking on when using defrost mode in the winter.
>>Didn't need it.

>
> Exactly.


Ever hear of "KISS"? It means, "Keep it Simple, Silly". Who cares
if the AC comes on (or off) on Defrost. I've noted that my Defrost
works a LOT BETTER when AC comes on during Defrost. Of course, if
one wants to think that they know more than the engineers... Also,
tinkering around like that VOIDS any or all warrantees.




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Old 13 Aug 2012, 10:03 am   #9 (permalink)
Ralph Mowery
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Default Re: AC compressor runs all the time?


"Sharx35" <sharx35@hotmail.com> wrote in message
news:k0a3fu$vq6$1@dont-email.me...
>

..
>
> Ever hear of "KISS"? It means, "Keep it Simple, Silly". Who cares if the
> AC comes on (or off) on Defrost. I've noted that my Defrost works a LOT
> BETTER when AC comes on during Defrost. Of course, if one wants to think
> that they know more than the engineers... Also, tinkering around like
> that VOIDS any or all warrantees.
>
>


It is also good to have the AC run some in the winter months. Keeps the
seals and other stuff lubercated. Bearings sitting in one spot long periods
of time tend to develope flat spots.


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Old 13 Aug 2012, 04:01 pm   #10 (permalink)
micky
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Default Re: AC compressor runs all the time?


>"Sharx35" <sharx35@hotmail.com> wrote in message
>news:k0a3fu$vq6$1@dont-email.me...
>>


Thanks for the reply. .
>>
>> Ever hear of "KISS"? It means, "Keep it Simple, Silly".


That refers to design, etc, not to being controlled by the design. .
http://en.wikipedia.org/wiki/KISS_principle
The car has alredy been designed and they made it complicated. They
made it so that turning on the Defrost turns on the AC, which is a
violation of KISS. And why should I be dominated by them?

>>Who cares if the
>> AC comes on (or off) on Defrost.


I do. It wastes gas and puts more load on the engine. .

>> I've noted that my Defrost works a LOT
>> BETTER when AC comes on during Defrost.


So you care, too. You just like it the way that's it's designed.

I've noted that the defrosters works well enough without AC. Maybe
we live in different areas of the country. Plus one can wipe the
condensation off with a cloth. That's the fastest method.

>> Of course, if one wants to think
>> that they know more than the engineers..


FWIW the engineers don't know me personally, and they are driven by
more factors than what I want. For example, on the Solara, when one
puts the top down, all the windows go down. That's very nice except
for higway trips or when I have a passenger I want to talk to, and in
noisy parts of town (most places with 4 or more lanes of traffic), or
when it's moderately cool outl, then I want the windows up. They
don't know that.

Also on this car, unlike my previous 6 convertibles, the top won't go
up or down unless I'm going under 3 mph or less.. When it's starting
to rain that's not good. Then I like to put the top up when I'm going
about 8 mph, which is fast enough to keep almost all of a light rain
out of the car, but more than slow enough not to hurt the top.
Actually 15 mph is okay,

I also do this when I'm putting the top down and leaving at the same
time, and even when I'm getting home and just don't want to waste
time. From the manual, I've identified the wire that prevents this,
and when I find the ECU that it's connected to, I'll cut the wire.

I don't, but If I always wanted the windows up, I'd find what make
them go down and disconnect it.

On a previous car, I didn't like it that the heater blew cold air
until the coolant warmed up, so I put a thermal switch in the coolant
hose that prevented the fan from working until the coolant was warm
enough. I don't know if that is a problem with this car.

If something isn't the way I want it, I fix it if I can.

>> Also, tinkering around like
>> that VOIDS any or all warrantees.


No. It voids warranties on the part of the car one has tinkered with.
If they tell you otherwise and won't repair something that is
unrelated to the tinkering and covered by the warranty, sue them.

I don't think I have a warranty on my 12 year old car.
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