Car Ac Pressure Switch Wiring Diagram

Find the signal on the wiring diagram that you are missing at the relay and continue to follow it back.

Car ac pressure switch wiring diagram. You have to bypass 3 wire ac pressure switch from b1 to b4 to power up the compressor clutch. How to vacuum ac system in your car. Take caution when doing this as you can cause damage if you are not familiar with how your ac electrical system works. Vintage air 18865 goll st.

How the ac works in ford escape. Dual function high pressure switch. Pcm checks cylinder head temp sensor. Ac system not working properly.

You have to make sure that the compressor has enough oil to function properly. In a few car models the power of the air conditioning system flows from the ac switch to the fuse before being transmitted to the clutch oil through the low pressure evaporator temperature. Connect the wires according to the numbers printed on it. The connection sends 0 5 volts of pressure to the pcm fuse.

Must be below set. You can next try jumping the pressure switch es to see if you can get the compressor to operate. San antonio tx 78266 p. Low pressure ac cycling switch.

So a shorted sensor will render the crank sensor inoperable. Hvac controller checks evaporator temp sensor. Hvac controller sends an ac request signal to pcm 4. It so happens that on some vehicles cadillacs the high pressure sensor is connected to the other sensor voltage reference line.