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F350 thermostat calibration

Tiny
ONESEMPERFI
  • MEMBER
  • 2007 FORD F-350
  • V8
  • 4WD
  • AUTOMATIC
  • 32,000 MILES
I have a 2007 F350 with auto temp control. The exterior temp gauge reads much warmer than actual and will read warmer as the engine compartment warms. It also seems to effect the interior temperature output.
Monday, January 17th, 2011 AT 4:12 AM

9 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
The ambient air temperature sensor is suppposed to be attached to left side of the grille opening panel to the left of the A/C condenser core.

Ensure it is positioned correctly and not being affected by air from the A/C condenser or engine which would change the reading. Any reading from this sensor affects the climate control system output.
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Monday, January 17th, 2011 AT 1:56 PM
Tiny
ONESEMPERFI
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  • 5 POSTS
I am not seeing anything that looks like a sensor on the left side of the grille opening. What does it look like? Would it be anywhere else?
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Tuesday, January 18th, 2011 AT 12:45 AM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
That should be the location of the sensor and if it is not ther, it could have been dislodged causing the problem.

It is a sensor with 2 wires and a clip to hold the sensor into position.

I am not able to find any suitable diagrams to show you.
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Tuesday, January 18th, 2011 AT 12:32 PM
Tiny
ONESEMPERFI
  • MEMBER
  • 5 POSTS
I found it after removing the grill on the right side attached. Is there a way to test it or do I just need to replace it?
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Tuesday, January 18th, 2011 AT 5:02 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
C1 CHECK THE AMBIENT TEMPERATURE SENSOR RESISTANCE

†Key in OFF position.
†Disconnect: Ambient Temperature Sensor C132

†Measure the resistance between the ambient temperature sensor terminals.

†Is the resistance within the specified values for these temperature ranges: 10-20°C (50-68°F), 37,000-58,000 ohms; 20-30°C (68-86°F), 24,000-37,000 ohms; 30-40°C (86-104°F), 16,000-24,000 ohms?
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Tuesday, January 18th, 2011 AT 5:24 PM
Tiny
ONESEMPERFI
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What does the resistance need to be for 10-30 degrees F?
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Tuesday, January 18th, 2011 AT 5:29 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Sorry the specs for that temperature range is not available in our database.
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Tuesday, January 18th, 2011 AT 5:37 PM
Tiny
ONESEMPERFI
  • MEMBER
  • 5 POSTS
I thought you might be enjoying warmer weather. Thank you for your help.
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Tuesday, January 18th, 2011 AT 7:40 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
You're welcome.

I live in the tropics so the weather is always warm but beginning and ending of the year we have a lot of rainy days.

Have a nice day.
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Wednesday, January 19th, 2011 AT 5:27 PM

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