P0537 1999 Ford F150 Code - A/C Evaporator Temperature Circuit Low Input
Quick Answer
The A/C Evaporator Temperature (ACET) sensor contains a thermistor which receives a reference voltage from the Powertrain Control Module (PCM). Common causes include Faulty A/C Evaporator Temperature (ACET) Sensor, A/C Evaporator Temperature Sensor harness is open or shorted, A/C Evaporator Temperature Sensor circuit poor electrical connection. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.
- What it means
- P0537 1999 Ford F150 indicates A/C Evaporator Temperature Circuit Low Input .
- Common causes
- Common causes include Faulty A/C Evaporator Temperature (ACET) Sensor, A/C Evaporator Temperature Sensor harness is open or shorted, A/C Evaporator Temperature Sensor circuit poor electrical connection.
- Severity
- Low - monitor the vehicle and repair when practical.
- Can I drive?
- The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.
Code P0537 1999 Ford F150 Description
The PCM maintains evaporator core temperature and prevents icing of the evaporator core, by disengaging the A/C compressor clutch when the evaporator A/C Evaporator Temperature sensor reading falls below acceptable levels, and by engaging the A/C compressor clutch when the discharge air temperature rises above acceptable levels.
The A/C Evaporator Temperature sensor is located inside of the heater core and evaporator core housing in the air-stream leaving the evaporator core.
The Diagnostic Trouble Code (DTC) Indicates the ACET signal input is less than Self-Test minimum. The Self-Test minimum is 0.13 volts.
What are the Possible Causes of the DTC P0537 1999 Ford F150?
- Faulty A/C Evaporator Temperature (ACET) Sensor
- A/C Evaporator Temperature Sensor harness is open or shorted
- A/C Evaporator Temperature Sensor circuit poor electrical connection
- Faulty Powertrain Control Module (PCM)
How to Fix the DTC P0537 1999 Ford F150?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0537 1999 Ford F150 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P0537 1999 Ford F150 Code
1. What does the OBDII code P0537 mean on a 1999 Ford F150?
P0537 indicates an issue with the A/C evaporator temperature sensor, specifically that the circuit is reporting a low input signal.
2. What are the symptoms of code P0537 in a 1999 Ford F150?
Common symptoms include poor air conditioning performance, inconsistent cabin temperatures, or the A/C system not functioning at all.
3. What causes the P0537 code to be triggered?
Possible causes include a faulty A/C evaporator temperature sensor, damaged wiring or connectors, or a malfunctioning climate control module.
4. Can I still drive my 1999 Ford F150 with a P0537 code?
Yes, you can drive the vehicle, but the A/C system may not work properly, which could be uncomfortable in extreme temperatures.
5. How do I diagnose the P0537 code on my Ford F150?
Begin by visually inspecting the A/C evaporator temperature sensor and its wiring. Use a multimeter to check for proper voltage and continuity in the circuit.
6. How can I fix the P0537 code on a 1999 Ford F150?
Repairs may include replacing the A/C evaporator temperature sensor, repairing or replacing damaged wiring, or resetting the code after addressing the underlying issue.
7. Where is the A/C evaporator temperature sensor located in a 1999 Ford F150?
The sensor is typically located near or within the evaporator core housing, which is behind the dashboard.
8. How much does it cost to repair a P0537 code on a Ford F150?
The cost varies, but replacing the A/C evaporator temperature sensor typically ranges from $50 to $150 for parts, plus labor if done by a professional.
9. Can a P0537 code cause damage to other parts of the A/C system?
Not directly, but ignoring the issue could lead to inefficient cooling, which may strain other A/C components over time.
10. Will clearing the P0537 code fix the problem permanently?
No, clearing the code without addressing the underlying issue will only temporarily remove the warning, and the code is likely to return.
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