P1435

Ford

A/C Refrigerant Temperature Circuit Range/Performance

Definition source: Manufacturer reference catalog
Definition verification: Not independently verified for display.
Time: Varies by diagnosis and vehicle | Diagnostic difficulty: Medium
Low Severity

The vehicle's control system has detected an A/C refrigerant temperature circuit reading or response that is outside the expected range or does not behave as expected. The sensor circuit helps the system monitor refrigerant temperature and manage A/C operation. This code identifies a detected condition; it does not by itself prove the sensor or any other part has failed.

Report an error with this code

⚠️ Before You Begin (Safety First)

Driving is generally not affected by this A/C-related code alone. If the A/C or defogging function is not working well enough to maintain visibility, pull over safely. Do not open refrigerant lines or handle refrigerant; the system can contain pressurized refrigerant that can cause injury.

Common Symptoms

  • The check-engine light may be on because the control system detected an A/C refrigerant temperature circuit range or performance issue.
  • A/C cooling may be reduced or inconsistent if the system cannot use the temperature information to manage operation as intended.
  • Defogging performance may be affected if the A/C system is not operating normally.
  • There may be no noticeable symptoms, especially if the circuit fault does not significantly affect A/C operation.

Common Causes

  • A refrigerant temperature sensor may provide an inaccurate or inconsistent signal.
  • Wiring or a connector in the temperature circuit may be damaged, loose, corroded or making intermittent contact.
  • An actual refrigerant-system condition may cause temperature behavior the control system considers out of range or implausible.
  • A control-system or circuit fault may affect how the temperature signal is read; testing is needed before identifying a failed component.

Diagnostic Steps

  1. Record the code and note whether the A/C cooling or defogging has changed; this helps establish the conditions associated with the fault.
  2. With the vehicle safely parked and the system off, visually check accessible A/C-related wiring and connectors for damage, looseness or corrosion. Do not pull on wiring or disconnect components unless the vehicle-specific procedure calls for it.
  3. If available, use a scan tool to note the A/C temperature data and whether it changes plausibly with operating conditions. Do not rely on an isolated reading to identify a failed part.
  4. Do not open refrigerant lines, add refrigerant based only on this code, or probe circuits without the correct service information. Have a qualified technician test the electrical circuit and refrigerant system if the code returns.

When to Call a Professional

Use a scan tool to review the code and relevant A/C temperature data, checking whether readings respond plausibly as operating conditions change. Inspect the accessible sensor wiring and connectors, then test the circuit using model-, year- and engine-specific service information. Assess refrigerant-system operation with proper A/C service equipment before condemning a sensor or adding refrigerant.

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Commonly Asked Questions

Does P1435 prove the A/C refrigerant temperature sensor is bad?

No. It indicates a range or performance problem in the temperature circuit. The sensor, its wiring or connector, actual system conditions, or another circuit issue may be involved.

Does this code mean the A/C refrigerant is low?

Not by itself. The code concerns refrigerant temperature circuit behavior, not a confirmed refrigerant charge level. Charge and system operation need to be checked with suitable equipment.

Can I keep driving with P1435?

The code alone usually does not affect basic driving. A/C or defogging may be impaired, so do not continue if reduced visibility makes driving unsafe.

Can I replace the sensor without testing the circuit?

That risks replacing a good part. Check scan data, wiring and connectors, and confirm system behavior using service information for the exact vehicle before choosing a repair.

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