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

Quick Answer

The P1437 Ford code indicates a problem with the A/C evaporator air temperature circuit being too high. Common causes include Faulty temperature sensor: A malfunctioning temperature sensor can provide incorrect readings to the HVAC control module, leading to the high temperature circuit code, Wiring issues: Damaged or corroded wiring connecting the temperature sensor to the control module can cause communication errors and trigger the code, HVAC control module failure: A fault in the HVAC control module can disrupt the operation of the A/C evaporator air temperature circuit, resulting in the code being set. 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 Ford indicates A/C Evaporator Air Temperature Circuit High.
Common causes
Common causes include Faulty temperature sensor: A malfunctioning temperature sensor can provide incorrect readings to the HVAC control module, leading to the high temperature circuit code, Wiring issues: Damaged or corroded wiring connecting the temperature sensor to the control module can cause communication errors and trigger the code, HVAC control module failure: A fault in the HVAC control module can disrupt the operation of the A/C evaporator air temperature circuit, resulting in the code being set.
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 08, 2024
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Code P1437 Ford Description

The P1437 Ford code indicates a problem with the A/C evaporator air temperature circuit being too high. The A/C evaporator is a component of the vehicle's air conditioning system that is responsible for cooling down the air before it is blown into the cabin. The evaporator is typically located inside the HVAC (Heating, Ventilation, and Air Conditioning) unit and works by removing heat from the air passing over it.

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

Common Causes of P1437 Ford

  1. Faulty temperature sensor: A malfunctioning temperature sensor can provide incorrect readings to the HVAC control module, leading to the high temperature circuit code.
  2. Wiring issues: Damaged or corroded wiring connecting the temperature sensor to the control module can cause communication errors and trigger the code.
  3. HVAC control module failure: A fault in the HVAC control module can disrupt the operation of the A/C evaporator air temperature circuit, resulting in the code being set.
  4. Refrigerant leak: A refrigerant leak in the A/C system can also affect the cooling efficiency and trigger the code.

Symptoms of P1437 Ford

  1. Reduced cooling efficiency: The A/C system may struggle to cool the air properly, resulting in less effective cooling in the cabin.
  2. Inconsistent temperature output: The A/C system may blow air at varying temperatures, making it challenging to maintain a comfortable cabin temperature.
  3. A/C system cycling frequently: The A/C compressor may cycle on and off more frequently than usual, indicating an issue with the cooling system.
  4. A/C system not working at all: In severe cases, the A/C system may fail to work altogether, leaving the cabin hot and uncomfortable.

How to Fix P1437 Ford

  1. Diagnose the issue: Use a scan tool to read the code and pinpoint the exact cause of the A/C evaporator air temperature circuit high problem.
  2. Check the temperature sensor: Test the temperature sensor for proper operation and replace it if necessary.
  3. Inspect the wiring: Check the wiring connecting the sensor to the control module for any damage or corrosion and repair as needed.
  4. Test the HVAC control module: Verify the operation of the HVAC control module and replace it if it is found to be faulty.
  5. Recharge the A/C system: If a refrigerant leak is suspected, repair the leak and recharge the A/C system to ensure proper cooling efficiency.

Cost to Fix P1437 Ford

The cost of repairing a P1437 Ford code related to the A/C evaporator air temperature circuit high can vary depending on the exact cause of the issue and the labor rates at the auto repair shop. In general, the cost of parts such as a temperature sensor or HVAC control module can range from $50 to $200, while labor costs can add another $100 to $300 to the total bill.

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Information for Specific Ford Models

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.

Frequently Asked Questions about P1437 Ford Code

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  • Checked entire electrical system, more than once and all is in working order, but I don't have specs. on acet sensor resistance or reference volts. Cleared code and ran KOER test and code came right back.

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