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Engine-Codes – Mercury – P1437 Mercury

P1437 Mercury Code - A/C Evaporator Air Temperature Circuit High

Quick Answer

The P1437 diagnostic trouble code (DTC) for Mercury vehicles indicates a problem with the A/C Evaporator Air Temperature Circuit being too high. Common causes include Faulty A/C evaporator temperature sensor, Wiring or connection issues in the A/C evaporator temperature circuit, Malfunctioning A/C control module. 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
P1437 Mercury indicates A/C Evaporator Air Temperature Circuit High.
Common causes
Common causes include Faulty A/C evaporator temperature sensor, Wiring or connection issues in the A/C evaporator temperature circuit, Malfunctioning A/C control module.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 10, 2024
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Code P1437 Mercury Description

The P1437 diagnostic trouble code (DTC) for Mercury vehicles indicates a problem with the A/C Evaporator Air Temperature Circuit being too high. The A/C evaporator is responsible for cooling the air that is blown into the vehicle's interior, so a high temperature reading suggests that the system is not functioning properly. This issue can have a significant impact on the performance of the vehicle's air conditioning system, leading to reduced cooling capabilities and discomfort for the occupants.

OBDII Code P1437 Mercury - A/C Evaporator Air Temperature Circuit High
P1437 Mercury Code - A/C Evaporator Air Temperature Circuit High

Common Causes of P1437 Mercury

  1. Faulty A/C evaporator temperature sensor
  2. Wiring or connection issues in the A/C evaporator temperature circuit
  3. Malfunctioning A/C control module
  4. Refrigerant leakage in the A/C system
  5. Blockage or restriction in the A/C system components

Symptoms of P1437 Mercury

  1. Reduced cooling efficiency from the air conditioning system
  2. Unusual or inconsistent temperature output from the vents
  3. A/C system blowing warm air instead of cold
  4. Increased humidity levels inside the vehicle
  5. A/C system cycling on and off frequently

How to Fix P1437 Mercury

  1. Diagnose the issue by using a diagnostic scanner to read the DTC and identify the specific cause of the high A/C evaporator air temperature circuit reading.
  2. Inspect the A/C evaporator temperature sensor and its wiring for any signs of damage or corrosion. Replace the sensor if necessary.
  3. Check the A/C control module for proper operation and connection. Repair or replace the module if it is found to be faulty.
  4. Perform a thorough inspection of the A/C system components for leaks, blockages, or restrictions. Repair or replace any damaged parts as needed.
  5. Clear the DTC from the vehicle's computer system and test the A/C system to ensure that the issue has been resolved.

Cost to Fix P1437 Mercury

The cost of repairing a P1437 DTC related to the A/C Evaporator Air Temperature Circuit High can vary depending on the specific cause of the issue and the labor rates at the auto repair shop. Typically, the repair costs for this issue can range from $150 to $500, including parts and labor. However, it's important to note that labor rates can vary between $80 and $150 per hour, so the total cost may be higher in certain locations or at dealerships. It's recommended to contact local auto repair shops for a more accurate estimate based on the vehicle's make and model.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

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