Where is AC compressor relay switch?
In most cases, the relay is mounted on the fender well or fire wall. The relay in a typical A/C control installation has a three-wire connection. One wire is a ground, one wire is the input from the interior control panel and switches, and one wire is the power feed to the A/C compressor clutch.
What controls the AC compressor relay?
The air conditioner (A/C) relay, is a relay used to send electrical power to the air conditioning compressor, and air conditioning compressor clutch when the system is turned on. It operates just like any other relay, and is often controlled by a button labeled ‘A/C’.
Do relays work with AC?
General Purpose Relays are electromechanical switches, usually operated by a magnetic coil. General purpose relays operate with AC or DC current, at common voltages such as 12V, 24V, 48V, 120V and 230V, and they can control currents ranging from 2A-30A.
What does a bad AC relay look like?
Signs of a Bad or Failing AC Compressor Relay. Common signs include inconsistent cooling, not hearing a click from the compressor turning on, and no cold air. One of the most obvious signs that the AC relay may have a problem is that the compressor is not coming on at all.
What makes AC relay go bad?
The most common cause of a relay that fails to engage the compressor remains a low system. We have pressure sensors in the car air-conditioning system that prevents the relay from energizing when the refrigerant is low. The most common cause of this situation is a slow leak from a Freon O-ring seal.
How much is an AC relay?
AC Fuse, Circuit Breaker or Relay Replacement Cost It costs between $15 and $300 to replace fuses, circuit breakers or relays in an AC unit.
Does an AC relay need a diode?
Diodes should NOT be used on AC relays. If volt spikes are a problem you may use a suitably rated varistor or a resistor and capacitor in series across coil to act as a “snubber”. A fuse is not strictly needed but may help protect wiring if coil goes shortcircuit.
