What does an AC relay switch do?
An air conditioner uses relays to switch the system’s high-voltage parts on and off. The relay contains a low-voltage coil and a high-voltage switch, sometimes called “contact points.” When the thermostat switches on, a low-voltage signal energizes the appropriate relay.
What is an A c compressor control relay?
A/C Compressor Control Relay. The air conditioning compressor control relay switches the compressor on and off when necessary to maintain the ideal interior cabin temperature. Over time, the relay wears out and needs to be replaced to make use of the AC system.
What causes AC relay failure?
Possible causes are low refrigerant, a faulty pressure switch, a faulty control switch or a faulty computer. If power and ground are found here, move to the next step. With the engine running, and the A/C controls in the max cooling positions, test for power at the compressor clutch electrical connector.
How do I know if my AC relay is bad?
- Inconsistent cooling. The AC compressor is powered by the relay.
- AC compressor is not turning on. One of the most obvious signs that the AC relay may have a problem is that the compressor is not coming on at all.
- No cold air.
How much is an AC compressor relay?
How much does an a/c compressor relay cost? It’s cheap and easy. It’s as simple as swapping out one relay for another and then testing the system. Expect prices to start around $35 to $100+ for a replacement of the relay alone.
How much does it cost to replace AC relay?
AC Relay Replacement Cost Replacing a relay costs $80 to $300. Relays are used to send voltage to the different parts of the system to turn on and off. Since this part controls the system, it won’t power on if the relay switch is failing. Before a relay fails, you may notice poor cooling in the home.
How much does it cost to replace a relay switch?
The average cost for starter relay replacement is between $62 and $70. Labor costs are estimated between $30 and $38 while parts are priced at $32. This range does not include taxes and fees, and does not factor in your specific vehicle or unique location. Related repairs may also be needed.