How much does a thermostat replacement cost?

A thermostat replacement typically costs $150-$400 including parts and labor. It is one of the more affordable cooling system repairs and can resolve many temperature-related codes.

Why does my car keep overheating?

Common causes include a stuck thermostat, low coolant from leaks, a failed water pump, a clogged radiator, or malfunctioning cooling fans. A proper diagnosis is needed to identify the specific cause.

P0534

Air Conditioner Refrigerant Charge Loss

Moderatecooling

Overview

The P0534 diagnostic trouble code indicates a air conditioner refrigerant charge loss condition. This code relates to the engine cooling system or air conditioning system. Cooling system problems can lead to overheating and serious engine damage if not addressed in a timely manner.

Symptoms

Temperature gauge reading high or low
Sweet coolant smell from engine bay
A/C not blowing cold air
Coolant loss without visible leak

Common Causes

Clogged or damaged radiator
Failed thermostat (stuck open or closed)
A/C compressor failure or refrigerant leak
Low coolant level from a leak

Diagnosis Steps

1Connect an OBD-II scanner and read all stored trouble codes and freeze frame data
2Check coolant level and inspect for visible leaks
3Test the thermostat by monitoring coolant temperature during warm-up
4Inspect the coolant temperature sensor and its wiring
5Test the cooling fan operation by running the AC or using a scan tool

Estimated Repair Cost

$100 — $800

Cost varies by vehicle, location, and repair shop. Includes parts and labor.

Commonly Affected Vehicles

Volkswagen TiguanFord TaurusMercedes-Benz C-ClassHonda Odyssey

Related Codes

P0125 P0118 P0117

More Cooling Codes

P0115Engine Coolant Temperature Circuit Malfunction

Moderate

P0116Engine Coolant Temperature Circuit Range/Performance

Moderate

P0117Engine Coolant Temperature Circuit Low Input

Moderate

P0118Engine Coolant Temperature Circuit High Input

Moderate

P0119Engine Coolant Temperature Circuit Intermittent

Moderate

P0125Insufficient Coolant Temperature for Closed Loop Fuel Control

Moderate

Frequently Asked Questions

If your engine is overheating, stop driving immediately to prevent catastrophic engine damage. If the code is related to a sensor or thermostat and the temperature is stable, drive cautiously to a repair shop.