Where is the low pressure AC switch located?
The low side service valve is located in the line that runs from the compressor through the evaporator (firewall) and up to the condensor on the low pressure (suction) side of the system.
Where is the AC pressure sensor located?
The AC low-pressure sensor is located at the line that runs from the compressor component of the system through the evaporator or the firewall of the system, up to the condenser on the low-pressure side of the air conditioning system.
How do you test a low pressure switch on an HVAC system?
How to Test a HVAC Pressure Switch
- Inspect the terminals on the pressure switch.
- Set the voltmeter or multimeter to display AC volts.
- Touch one of the probes from the meter to either one of the terminals on the pressure switch.
- Check the voltage reading on the meter.
Where are the low and high AC pressure switches located?
The low-pressure side switch is found before the AC compressor, while the high-pressure switch comes after the compressor. Most AC pressure switches are found within the engine compartment, but some manufacturers put them elsewhere. A look in your service manual will show you the appropriate location for your model. AC Pressure Switch Function
What to do if your AC pressure switch is off?
If the low or high pressures are off, there is a larger problem with the system. With the OBDII port on your vehicle, you can use a code scanner to check for DTCs. You can also use the code scanner to erase codes once you repair the problem.
Is it OK to jump the low pressure switch?
If you jump the low pressure switch with the engine running, do it only for a few seconds. Do NOT jump the low pressure switch to operate the compressor non-stop so you can add refrigerant. I’m not kidding about this.
What happens when the low pressure switch is off on a car?
The orifice tube or expansion valve continues to release liquid into the evaporator as the car heats up. That liquid changes to a gas and flows into the compressor and out whichever compressor reed valves are open at the point. There’s always an opening between the high and low sides when the compressor is off. compressor clutch won’t engage.