HVAC Purge Relays

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HVAC Purge Relays

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What is an HVAC Purge Relay?

An HVAC Purge Relay is a type of electrical switch used to control the flow of current in a vehicle's HVAC system. It is designed to control the flow of power between the HVAC system's components and the vehicle's battery, allowing the system to start and stop as needed.

What is the purpose of an HVAC Purge Relay?

The main purpose of an HVAC Purge Relay is to control the power flow within the HVAC system, allowing it to start and stop as needed. This helps to keep the system running efficiently and prevents it from overloading the vehicle's electrical system.

How do I know if my HVAC Purge Relay is faulty?

If you are experiencing any of the following issues with your HVAC system, it is likely that your HVAC Purge Relay is faulty:

  1. The system is not starting when it should.
  2. The system is not turning off when it should.
  3. The system is not cycling on and off as it should.


Can a faulty HVAC Purge Relay cause damage to my vehicle?

Yes, a faulty HVAC Purge Relay can cause damage to your vehicle's electrical system if it is not replaced. This could result in further damage to other parts of your HVAC system, as well as other components of your vehicle.

How do I replace an HVAC Purge Relay?

Replacing an HVAC Purge Relay is a fairly straightforward process.

  1. Disconnect the vehicle battery.
  2. Find the HVAC Purge Relay in your vehicle, it should be located near the HVAC system's components.
  3. Unplug the old relay and remove it from the vehicle.
  4. Install the new relay and plug it into the vehicle.
  5. Reconnect the vehicle battery.


How often should I inspect my HVAC Purge Relay?

It is recommended that you inspect your HVAC Purge Relay at least once a year to ensure it is functioning properly. Additionally, it is recommended that you inspect the relay any time you experience an issue with your HVAC system.