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The thermal expansion valve is the part of your vehicle’s air conditioning (A/C) system that controls the system’s pressure, fluid flow rate, and evaporator output temperature.

The thermal expansion valve is usually found inside the vehicle’s evaporator case, attached to the evaporator itself. The evaporator, on the other hand, can typically be found inside the passenger compartment, either deep inside or under the instrument panel.

The exact location of the thermal expansion valve often depends on the vehicle’s make and model. For instance, if you own a 2003-2007 Honda Accord, you’ll find it inside the dashboard near the evaporator core. The thermal expansion valve on a 2005 Toyota Sienna, on the other hand, can be found mounted onto the vehicle’s A/C unit. It’ll be on the cabin side of the A/C housing.

Tips on How to Access the Thermal Expansion Valve

Accessing the thermal expansion valve can be a difficult and complex project best left to a professional mechanic. Removing the valve requires a depressurized A/C unit, which you need expert tools to perform. The released gas is particularly dangerous as well.

You might need to remove the dashboard and center console entirely before even catching sight of the thermal expansion valve. In addition, you need to seal the system after removing the valve because moisture might enter the system if you don’t. After replacing the valve, the A/C system will need a recharge.

Any information provided on this Website is for informational purposes only and is not intended to replace consultation with a professional mechanic. The accuracy and timeliness of the information may change from the time of publication.

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