Using a scan tool with live data, check the status of: Cylinder head temperature sensor, Engine coolant temperature sensorĮvaporator temperature sensor, Low pressure AC cycling switch, Dual function high pressure switch. If still no voltage at compressor clutch connector, check for open in wiring harness from relay to compressor. If you’re not getting battery voltage at the compressor clutch connector and you’ve completed all the voltage checks in steps 1-3, swap in another compressor clutch relay. ![]() If you see battery voltage, check the other terminal for ground. Check for battery voltage on one terminal of the connector. If so, proceed to check relay operation and compressor clutch wiring. If PCM is providing ground, that confirms all temperature and pressure sensors are within acceptable range. Step 3: With engine running and AC turned on, use test light to check for ground on terminal 1 in relay socket. ![]() Step 2: Use test light to check for battery voltage on terminals 2 and 3 in relay socket. If good, remove AC compressor clutch relay from socket. Step 1: Using a test light, check fuses 27 and 13. When condenser pressure drops, high psi switch closes and completes circuit to PCM and PCM provides ground to AC compressor clutch control coil to close clutch contacts Diagnose compressor clutch doesn’t engage on Ford Escape If PCM sees open at high psi switch, it interrupts ground to compressor clutch control coil AND operates high speed condenser fan. Compressor clutch receives ground at left front corner of engine compartmentġ3. PCM grounds AC compressor clutch relay control coil which closes relay contacts and sends power to compressor clutch coil.ġ2. ![]() Low pressure switch is located on the evaporator outlet lineĭuel function high pressure switch is located on the receiver drierġ1. PCM checks high psi switch at ACPSW switch inputs from dual function switch. PCM checks for power from AC low pressure switch in series with high psi switch through ACCS input.Ĩ. PCM checks ambient temp sensor-must be above 35☏ĥ. HVAC controller sends an AC request signal to PCMĤ. HVAC controller checks evaporator temp sensor. Components used in the Ford Escape AC systemĭual function high pressure switch How the AC works in Ford EscapeĢ.
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