Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Automatic Temperature Control Sensor
On Crown Victoria, sensor is located behind instrument panel, above radio. On Grand Marquis, sensor is located behind instrument panel, directly above A/C control panel and clock. See Fig 1 . The sensor contains a thermistor whose resistance varies with temperature. The thermistor provides an input to control module.
The sensor also includes an aspirator tube and a foam inlet seal. The aspirator provides a very small vacuum to draw a continuous sampling of passenger compartment air across thermistor. Forced air is routed to sensor through a tube from blower stream, giving power to operate aspirator.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.