Ambient temperature indicator
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More Turbo
Joined: Aug 2004
Posts: 689
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From: Rodeo, Ca.
Ambient temperature indicator
Posted this in electrical section but don't know how many check that.
I noticed this on my last few F-150s. If I drive downhill about 10 miles from our cabin in the mountains, (narrow, slow dirt road), my ambient temperature indicator won't update until I get to the spot where I can get up to normal road speeds. Seems to work fine going uphill the same way. What the heck is this tied to? Speed, throttle, ?? Anybody from Ford on here who can tell me? Thanks
I noticed this on my last few F-150s. If I drive downhill about 10 miles from our cabin in the mountains, (narrow, slow dirt road), my ambient temperature indicator won't update until I get to the spot where I can get up to normal road speeds. Seems to work fine going uphill the same way. What the heck is this tied to? Speed, throttle, ?? Anybody from Ford on here who can tell me? Thanks
Senior User
Joined: Jun 2004
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From: Tennessee USA
Fleet Mechanic
Joined: Dec 2008
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From: Burleson, Tx
But I cannot tell you if it is 'tied' to anything.
Fleet Mechanic
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Thread Starter
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More Turbo
Joined: Aug 2004
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From: Rodeo, Ca.
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Elder User
Joined: Feb 2006
Posts: 537
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From: Formerly Nawlins
Mine works, but not very fast at sampling temperature differences. When I leave for work in the morning at around 82 degree weather it will usually show that and by the time I get to work 15 or so miles later it may be in the 85-87 range depending on the day. I can drive around the site on a few short runs during the day and it will not go up from that 0830 85-87 temp it got on the way in. When I leave for the day at the temp is 95 and feels like 110, it still reads 85-87 for at least 1/3rd the way home. Have noticed since getting the truck 3.5 years ago.
On the other hand, my Turbo Regal will show the 110 degrees that it feels like sitting in the sun when I leave for home, but will come down to the 95-99 it is in a 1/4 mile or so.
I sure hope the temp sensors Ford uses for the A/F mixture are better at intake air temp reading. Glad I have an N/A and not a EB. Glad to know GM has it right on my turbo Buick .... sooner or later I will want a turbo truck and I really do not want a full sized 4 cylinder engine truck. Besides they are kinda ugly anyway!
On the other hand, my Turbo Regal will show the 110 degrees that it feels like sitting in the sun when I leave for home, but will come down to the 95-99 it is in a 1/4 mile or so.
I sure hope the temp sensors Ford uses for the A/F mixture are better at intake air temp reading. Glad I have an N/A and not a EB. Glad to know GM has it right on my turbo Buick .... sooner or later I will want a turbo truck and I really do not want a full sized 4 cylinder engine truck. Besides they are kinda ugly anyway!
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Fleet Mechanic
Joined: Jul 2005
Posts: 1,470
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From: Staten Island, NY
The ambient air temp sensor is an input to the PCM. The PCM then sends raw temperature data to the FCIM which filters it and sends the result to the APIM and finally to the touchscreen. There is a reset procedure for the AAT sensor:
On the HVAC panel controls press the A/C and Recirc buttons simultaneously the release both
Within 2 seconds press the A/C button again.
This might help things.
On the HVAC panel controls press the A/C and Recirc buttons simultaneously the release both
Within 2 seconds press the A/C button again.
This might help things.
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