Temp control on MAX A/C
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Freshman User
Joined: Dec 2003
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Temp control on MAX A/C
Can you adjust the temperature of the air output when running max AC or does it default to the coldest temperature?
I can adjust temperature on normal AC, but not MAX AC.
Thanks
I can adjust temperature on normal AC, but not MAX AC.
Thanks
Lead Driver
Joined: Feb 2000
Posts: 5,373
Likes: 46
From: Palm Bay, Florida
Your truck may have come from the factory that way.
There IS a mod that many of us do that involves splicing into the RED vacuum tube behind the glove box and running a line to an (added) heater control valve-in this case this mod renders the normal AND max a/c position (the temp dial) not adjustible, but it sure makes the a/c colder!!
Mine will get to 37* air from the vent in the max position!
There IS a mod that many of us do that involves splicing into the RED vacuum tube behind the glove box and running a line to an (added) heater control valve-in this case this mod renders the normal AND max a/c position (the temp dial) not adjustible, but it sure makes the a/c colder!!
Mine will get to 37* air from the vent in the max position!
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Freshman User
Joined: Dec 2003
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No problem with getting enough cold.
The problem is passengers as well as myself like the MAX setting so the Air recirculates and we dont smell the exhaust as much. But we dont always need it so frigid and would like to run on MAX but let the temp run a little warmer.
So far, it just seems that MAX has the default coldest setting without any adjustment to make it warmer.
Thanks
The problem is passengers as well as myself like the MAX setting so the Air recirculates and we dont smell the exhaust as much. But we dont always need it so frigid and would like to run on MAX but let the temp run a little warmer.
So far, it just seems that MAX has the default coldest setting without any adjustment to make it warmer.
Thanks
Cargo Master
Joined: Jun 2010
Posts: 2,771
Likes: 3
From: Louisiana
Like Dan said, before I put the heater shut off valve I could have max ac on and get hot or cold air out of the vents. What year is your truck?
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Freshman User
Joined: Dec 2003
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Truck is a Lariat 2003,
Thought I read somewhere that later years had different plumbing that puts out more cold and that there is a mod to accomplish this on earlier years.
Maybe there is a stuck valve somewhere that isnt actuating on MAX when I try to get warmer temperature ?
Thought I read somewhere that later years had different plumbing that puts out more cold and that there is a mod to accomplish this on earlier years.
Maybe there is a stuck valve somewhere that isnt actuating on MAX when I try to get warmer temperature ?
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Post Fiend
Joined: May 2009
Posts: 5,470
Likes: 3
From: Pea Ridge, AR
Follow your heater hoses, from the water pump over the engine to the firewall, if there is valve in the line, which I think there will be because I believe the 03's had the heater control valve, then I don't think you'll be able to control the temp without removing the vacuum line activating it and capping it off.
Lead Driver
Joined: Feb 2000
Posts: 5,373
Likes: 46
From: Palm Bay, Florida
This is kind of weird to me, if its factory installed heater control valve setup then it SHOULD be able to "mix" some warm air with the a/c air to get the temp you want.
On a side note I just remembered that there was some folks that spliced into the WHITE vacuum line behind the glove box door on earlier models and this makes ONLY the "max" position non-adjustible.
On a side note I just remembered that there was some folks that spliced into the WHITE vacuum line behind the glove box door on earlier models and this makes ONLY the "max" position non-adjustible.
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