What does the high pressure switch do?
A high pressure switch (HPS) and a low pressure switch (LPS) are protective devices for the compressor and refrigeration circuit. The high pressure switch monitors the system for an inoperative outdoor motor, and/or a dirty/restricted condenser (outdoor) coil.
Where is the high pressure switch located?
The high-side switch is located on the smaller of the two air conditioning lines close to the radiator on the passenger side of the vehicle. The low-side switch will be located on the largest diameter air conditioning line or on the side of the accumulator (round container) on the passenger side firewall.
How do I test a high pressure switch?
Disconnect the wires connected to the pressure switch by pulling the wire connectors off of the switch terminals. Set a multimeter to test for resistance (ohms). Touch each tester probe to one of the switch terminals. The tester should read 0 or close to 0 (indicating no resistance).
Is there a high and low pressure switch?
There are both high pressure and low pressure switches; some vehicles are equipped with just a high pressure switch while others have both. Incorrect pressure can damage the compressor, hoses, and other A/C system components.
Where is the pressure switch on an A / C?
Filter your results by entering your Year, Make, Model to ensure you find the parts that fit your vehicle. The A/C pressure switch is mounted on both the high and low sides of your A/C. When the pressure in your A/C rises or lowers too much, this switch turns off the compressor to protect it and the rest of the system from damage.
What happens when you replace a pressure switch?
The most common symptom of a failed A/C pressure switch is an inoperative compressor and lack of A/C. In order to safely and efficiently replace your A/C pressure switch you need a couple of basic tools:
How much does a bad AC pressure switch cost?
Take the pressure sensor off and test the connection heading to the sensor from the electrical harness. Make sure your key is turned on to the accessories spot. When the electrical connection is working as it should, the multimeter will read between 4.0 and 5.0 volts. The bad AC pressure switch replacement cost falls between $50 and $300.