a/c clarification - max vs norm
Thread Starter
|
Posting Guru
Joined: Oct 2006
Posts: 1,265
Likes: 0
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.
Thread Starter
|
Posting Guru
Joined: Oct 2006
Posts: 1,265
Likes: 0
gotcha, so as expected the manual explanation is BS as i should use NORM when possible.
thanks guys
thanks guys
Trending Topics
Postmaster
Joined: Jun 2007
Posts: 2,621
Likes: 1
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.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Post Fiend
Joined: May 2004
Posts: 11,289
Likes: 6
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
Posts: 23,666
Likes: 301
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
Posts: 2,621
Likes: 1
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
Joined: Aug 2005
Posts: 23,666
Likes: 301
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
Joined: Aug 2005
Posts: 23,666
Likes: 301
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.