1986-1990 Ford Taurus Ambient Air Temperature Sensor Replacement Guide
Is your Taurus A/C acting strange or the outside temp display wrong? Your Ambient Air Temperature Sensor might be the problem.
- A bad AAT sensor primarily affects your automatic climate control and outside temperature display; it won't stop you from driving the car.
- Replacement is very easy and a great DIY task, typically located behind the front grille and requiring no special tools.
- New OEM parts are likely unavailable; aftermarket brands like NGK, Standard Ignition, and Holstein are reliable choices.
- There are no specific recalls or widespread known issues for this part on the 1986-1990 Taurus.
Is Your 1986-1990 Ford Taurus Ambient Air Temperature Sensor Failing?
For a car from the late 80s, the first-generation Ford Taurus had some advanced features, including automatic climate control on some models. That system relies on the Ambient Air Temperature (AAT) sensor to work correctly. When this sensor fails, it can cause confusing problems with your A/C and heat. Since this part is exposed to the elements at the front of the car, it's common for it to fail from physical damage, corrosion, or simply age.
Symptoms of a Bad AAT Sensor
A bad AAT sensor usually won't leave you stranded, but it can make your drive uncomfortable. Here are the most common signs:
- Incorrect Outside Temperature Reading: If your dashboard display shows a temperature that is obviously wrong (like 35°F on a hot summer day), the sensor is the most likely culprit.
- Automatic Climate Control Doesn't Work: The 'Auto' setting on your climate control may not work properly. It might not switch between heat and A/C, or the fan speed might be wrong because the system is getting bad information about the outside temperature.
- A/C Compressor Won't Turn On: In some systems, if the sensor incorrectly reports freezing temperatures, it will prevent the A/C compressor from turning on to protect it from damage. This can leave you with no cold air.
A Note on Check Engine Lights
While modern cars will set a specific trouble code (like P0071) for a bad AAT sensor, your 1986-1990 Taurus uses an older OBD-I diagnostic system. It may not trigger a Check Engine Light for this specific part. Diagnosis is usually based on the symptoms you experience with the climate control system.
Choosing the Right Aftermarket Sensor
For a vehicle of this age, finding a new sensor from Ford (OEM) is highly unlikely. The aftermarket is your best and only source for new parts. Thankfully, this is a simple sensor, and several reputable brands make reliable replacements.
Aftermarket Brand Tiers
- Top Tier (OEM Quality): Brands like NGK (also sold as NTK) and Standard Ignition (SMP) are well-known for making sensors that meet or exceed original factory quality. They are trusted by professional mechanics and are a safe bet for a long-lasting repair.
- Quality Value: Holstein is a solid choice that offers good quality for a lower price. They claim a low failure rate and often provide a good warranty, making them a smart buy if you're on a budget. User reviews place them as a good budget-end option.
- Economy: Brands like True Tech fall into the economy category. They are the most affordable but may have a shorter lifespan or less consistent quality. For a simple part like an AAT sensor, this can be an acceptable option if the lowest price is your main goal.
| Brand | Typical Price Range | Quality Tier |
|---|---|---|
| NGK / NTK | $25 - $40 | Top Tier |
| Standard Ignition (SMP) | $20 - $35 | Top Tier |
| Holstein | $15 - $25 | Quality Value |
| True Tech | $12 - $20 | Economy |
Installation is DIY-Friendly
Replacing this sensor is one of the easiest repairs you can do. It's almost always located just behind the front grille, clipped into the radiator support. You typically just need to unplug the electrical connector, release a small tab, and pop the old sensor out. The new one snaps right in. The entire job usually takes less than 15 minutes.
Frequently Asked Questions (FAQ)
Where is the AAT sensor located on a 1986-1990 Taurus?
You will almost always find the sensor at the front of the car, mounted behind the grille and in front of the radiator. This location allows it to get a good reading of outside air without being affected by engine heat. Look for a small, black plastic probe with a two-wire electrical connector.
Can I drive with a bad AAT sensor?
Yes. A bad ambient air temperature sensor will not affect your engine's performance or your ability to drive the car safely. The only impact is on the automatic climate control system and the outside temperature display, which can be an annoyance but not a critical failure.
Are there any recalls for the AAT sensor on my Taurus?
No, there are no known recalls or common Technical Service Bulletins (TSBs) from Ford for the ambient air temperature sensor on the 1986-1990 Ford Taurus. Any failure is due to the age of the part or damage from road debris.
Does this sensor affect fuel economy?
On your first-generation Taurus, this sensor's job is almost exclusively for the climate control system. It does not provide critical data to the engine computer for adjusting the fuel mixture, so a bad sensor will not impact your fuel economy.
Technical Specifications
Typically a two-pin thermistor sensor that changes resistance based on temperature. Mounts 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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