Lincoln Navigator Ambient Air Temperature Sensor Guide (2003-2010)
Is your Navigator's A/C acting up or showing the wrong outside temperature? A bad ambient air temperature sensor is the likely cause.
- A bad ambient air temperature sensor is the most common cause of an incorrect outside temp display and erratic automatic A/C operation.
- This is an easy and inexpensive DIY repair; the sensor is located behind the grille and requires basic tools to replace.
- For this non-critical part, a quality aftermarket brand like Dorman or Standard Ignition offers a good balance of price and reliability.
- No recalls or TSBs are currently active for this specific part on the 2003-2010 Navigator.
Is Your Lincoln Navigator's Temperature Reading Wrong?
One of the most common reasons for a faulty outside temperature reading or problems with the automatic climate control on a 2003-2010 Lincoln Navigator is a failed Ambient Air Temperature Sensor. This sensor sits at the front of your vehicle, constantly measuring the outside air. When it fails, it can cause confusing and uncomfortable issues inside your cabin.
Symptoms of a Bad Temperature Sensor
If this sensor is going bad, you'll likely notice one or more of these specific problems:
- Incorrect Outside Temperature Display: The reading on your dashboard will be obviously wrong, sometimes showing a very high or very low temperature that doesn't match the weather outside.
- Automatic Climate Control Won't Work: The 'AUTO' setting on your A/C and heat may stop functioning correctly because the system doesn't have an accurate outside temperature to base its calculations on.
- Poor A/C or Heater Performance: Even in manual mode, the system might not cool or heat as effectively as it should. In some cases, it can even prevent the A/C compressor from turning on at all.
- Check Engine Light: A failing sensor can trigger the check engine light and store a diagnostic trouble code, most commonly P0073.
Don't Mistake It for Other Issues
These symptoms, especially the A/C problems, can be similar to other issues like low refrigerant or a bad compressor. However, if you're also seeing a wildly inaccurate temperature on the dash, the ambient air temperature sensor is the most likely culprit and the cheapest part to replace first.
Choosing the Right Aftermarket Sensor
For the 2003-2010 Navigator, you have several options for a new sensor. Since this part doesn't affect the way your vehicle drives, a quality aftermarket part is a very practical choice.
- OEM (Motorcraft): Motorcraft is Ford's official brand and the original part manufacturer. It offers a guaranteed fit and the highest quality, but it is also the most expensive option. Part numbers can vary, but common ones for this era include AU5Z-12A647-B and DY-1137.
- Premium Aftermarket (Dorman, Standard Ignition): Brands like Dorman and Standard Ignition (SMP) are well-known for producing reliable replacement parts that meet or exceed original specifications. They are a solid choice for a balance of quality and cost.
- Budget Aftermarket (Skyward, True Tech, Holstein): These brands offer the most affordable path to fixing the problem. For a simple sensor like this, they can be a good option if budget is your primary concern, though their long-term durability may not match premium brands.
| Part Type | Estimated Cost |
|---|---|
| New OEM (Motorcraft) | $40 - $70 |
| New Aftermarket | $6 - $64 |
| Shop Labor | $50 - $100 |
Pro Tip: Easy DIY Replacement
Replacing this sensor is a simple job that most owners can do at home in under 30 minutes. The sensor is located behind the front grille, usually mounted to the radiator support. You'll typically only need basic hand tools to access it by removing a few plastic clips on the top of the grille surround. Once you can reach it, just unplug the electrical connector and unclip the old sensor. This can save you the cost of shop labor.
Frequently Asked Questions
Where is the ambient air temperature sensor on a 2003-2010 Lincoln Navigator?
It is located at the front of the vehicle, typically mounted on the radiator core support, just behind the grille. This position allows it to measure the outside air without being affected by engine heat.
Can a bad ambient temp sensor stop the A/C from working?
Yes. If the sensor sends a signal to the computer that it's freezing outside, the climate control system may prevent the A/C compressor from engaging to prevent damage. This results in no cold air from the vents.
Are there any recalls for this sensor on my Navigator?
No, searches of the National Highway Traffic Safety Administration (NHTSA) database did not find any recalls or technical service bulletins (TSBs) related to the ambient air temperature sensor for the 2003-2010 model years.
Do I need to reset the computer after replacing the sensor?
While some newer vehicles may require a reset, it is generally not necessary for this generation of Navigator. Disconnecting the battery for about 15 minutes during the replacement will typically clear any fault codes and allow the system to recognize the new sensor. The temperature reading should update after a few minutes of driving.
Technical Specifications
OEM Part Numbers: AU5Z-12A647-B DY-1137 5W7Z-12A647-A AE5Z-12A647-A
Typically a 2-pin thermistor sensor that plugs into a wiring harness located behind the front grille.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
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