Is there anyway possible to keep the recirculation on all the time on the lariats? It sucks having to keep turning it on.

 

I have not found a way. I also cannot recirculate the air on defrost, or any combination...defrost and feet, etc.

 

Beaver , I think there is a thread somewhere in the past , I tried to find it myself earlier today , and couldn't find it , but if I remember correctly , the recirc. problem can be corrected by changing the eatc control unit in the dash. I want to have mine corrected , and also need some info.

 

Mine sometimes stays on for less than minute. Sometimes it stays on until I turn it off. Annoying! This can't be right.

I also recall someone having their EATC control unit replaced, which solved that problem.

It sure is nice to be in recirc mode when you hit that occasional skunk!

 

"EATC"???

- Clem -
Mine also has a mind of its own and turns off randomly, or stays on until I turn it off.

 

EATC = Electronic Automatic Temperature Control

yes, there is fix for it. to lazy to search for it now though.

 

I ran a quick search...
Here is the SSM (Special Service Message) from Ford:

17261 2004 F-150 BUILT BEFORE 10/6/2003 - AMBIENT TEMPERATURE READING INACCURATE AND/OR POOR A/C PERFORMANCE
SOME 2004 F-150 VEHICLES BUILT BEFORE 10/6/2003 MAY EXHIBIT AN INACCURATE AMBIENT TEMPERATURE READING AND/OR POOR A/C PERFORMANCE. TO SERVICE, REPROGRAM THE PCM TO THE LATEST LEVEL USING WDS B27.10 RELEASE OR HIGHER


Some other people are of the opinion that it automatically shuts off to bring in fresh air. I don't know if they were just some dumba$$ like me, or if they actually knew what they were talking about. Makes sense to me, but I doubt that is the reason it shuts off.

 

Thats not the issue (listed above). Thats the Ambient (outside) temp reading....which can cause the EATC to work poorly. The fix for that involves "re-flashing" the computer. The re-circ issue involves replacing the entire unit.


PS> Look here https://www.f150online.com/forums/sh...ghlight=recirc

 

"AND/OR POOR A/C PERFORMANCE"

I guess that threw me off.

 

I was at a Ford Market Research Group a couple of months ago and brought up this exact problem. None of the engineers had an answer for this. The best that they could come up with was that the air in the inside, was at what was set on the control, and the truck switched off the recirc to bring in fresh air. We had a lady in the group that had something replaced on the A/C unit but it still did not help.
This was one of my major complaints. With the summers here in TX I have always used the recirc button full time in all my vehicles. I guess we will see how it does this summer.

Scott

 

I like to use it when I'm behind an ancient vehicle spewing out awful fumes.

 

my wife's mercedes manual has info about this, but i don't know if it's the same issue. her car also shuts off after a period of time and when the front defroster is on.

because today's cars and trucks are air-tight, an engineer believed that if air-recirc was on for an extended period of time, the occupants would run out of oxygen. so the rerirc shuts off after a period of time much like a rear defroster. now, the front defroster uses fresh air, since the air in the cabin on a cold day is typically more humid than the outside.

 

Many vehicles in the past (usaully with manual HVAC systems) did allow the driver to use the recirculate feature in any operating mode. Unfortunately, all too many customers did just that without understanding the consequences.

The biggest problem occurs when using recirc in either the heat mode or the defrost mode (when it's too cold outside for the A/C compressor to turrn on.) Without introding fresh outside air into the vehicle, the moisture being exhaled by the occupants builds up and the windows fog/frost up surprising quickly to the point where the defroster often can't do an adequate job of clearing the glass.

When in the defrost mode and it's warm enough outside for the A/C compressor to operate, this fogging issue is greatly reduced since the evaporator will dry out the inside air. But below 35 or so degrees, the compressor doesn't turn on so there's no drying of the air.

 

I haven't had mine just shut off on me but when ever I switch from what I want it to do and pass the off button it will turn it off. Example if I switch from defrost to AC and it turns off. It also does this when the engine is turned off. Its annoying it will not keep the setting you selected. I can't imagine that not being solved with software even on my FX4.

 

HERE'S THE FIX...

https://www.f150online.com/forums/showthread.php?s=&threadid=138495[/URL]