a/c clarification - max vs norm
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a/c clarification - max vs norm
looked in my owner's manual the other day. out of boredom, read the part about a/c operation.
more or less it said:
MAX - cools already chilled inside air. use when rapid cooling desired
NORM - cools warmer ouside air.
true, or just a dummy owner's manual explanation? i guess i'm asking what is "harder" on components. MAX AC, fan on 1 or NORM AC fan on 2 or 3. i always thought it was "easier" on the truck to have it on NORM, but the owner's manual makes it sound like the truck is working just as hard.
more or less it said:
MAX - cools already chilled inside air. use when rapid cooling desired
NORM - cools warmer ouside air.
true, or just a dummy owner's manual explanation? i guess i'm asking what is "harder" on components. MAX AC, fan on 1 or NORM AC fan on 2 or 3. i always thought it was "easier" on the truck to have it on NORM, but the owner's manual makes it sound like the truck is working just as hard.
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Posting Guru
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gotcha, so as expected the manual explanation is BS as i should use NORM when possible.
thanks guys
thanks guys
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Postmaster
Joined: Jun 2007
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From: Sweetwater Texas
nah, you can use Max A/C, it's not puttin any more strain on your motor, its is just usin a little bit more electricty, but you altenator should be puttin out more than enough power.
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Post Fiend
Joined: May 2004
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From: Lakewood, Ohio
ok, i went out and got my 94 f150 manual and my 94 explorer manual.
they both say that the 'sound' of the fan is more because it is not baffled and the explorer manual adds that the max setting 'has greater fuel efficiency'.
they both say that the 'sound' of the fan is more because it is not baffled and the explorer manual adds that the max setting 'has greater fuel efficiency'.
Fleet Owner
Joined: Aug 2005
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From: Easton,Ks
The book is right.
NORM is harder on everything by a long shot (not even close).
When the A/C system is on NORM the compressor has to work a lot harder, You have higher head pressure and it cost you MPG is gas. You are always working your compressor to the max.
When it is on MAX once the inside gets pulled down there is less of a Temp drop across the evaporator and the head pressure goes down and you engine does not have to work as hard and the MPG goes up.
NORM is harder on everything by a long shot (not even close).
When the A/C system is on NORM the compressor has to work a lot harder, You have higher head pressure and it cost you MPG is gas. You are always working your compressor to the max.
When it is on MAX once the inside gets pulled down there is less of a Temp drop across the evaporator and the head pressure goes down and you engine does not have to work as hard and the MPG goes up.
Last edited by subford; Jul 25, 2007 at 11:49 AM.
Postmaster
Joined: Jun 2007
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From: Sweetwater Texas
Max NOT more of a strain. Its about the equivalant of turning your stereo up louder with your headlights on. The only strain is on the battery and altenator.
Norm however is having to cool the air much more than Max, so the compressor has to work harder to cool the much hotter air.
Norm however is having to cool the air much more than Max, so the compressor has to work harder to cool the much hotter air.
Fleet Owner
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From: Easton,Ks
Originally Posted by Dean88
The only strain is on the battery and altenator.
The fan does not have to work as hard to move the air and more gets moved.
It is wired the same to the fan motor but being a DC motor it speed is controlled by its load and voltage. With the voltage the same and the load on the fan less it is moving more air and using less current.
Fleet Owner
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From: Easton,Ks
Originally Posted by Dean88
But don't both motors work when its on Max? The one to push cab air through the A/C, and another to push the air form A/C through the vents?
The only difference between NORM and MAX is that vacuum is applied to the recirculate vacuum motor in MAX and not in NORM.