Either too much resistence in the compressor clutch or the clutch relay, it sounds like.

..
. RELAY TEST









The compressor clutch relay is located in the Power Distribution Center (PDC) . Refer to the PDC label for relay identification and location. Remove the relay from the PDC to perform the following tests:

1. A relay in the de-energized position should have continuity between terminals 87A and 30, and no continuity between terminals 87 and 30. If OK, go to Step 2. If not OK, replace the faulty relay.
2. Resistance between terminals 85 and 86 (electromagnet) should be 75 ±5 ohms . If OK, go to Step 3. If not OK, replace the faulty relay.
3. Connect a battery to terminals 85 and 86. There should now be continuity between terminals 30 and 87, and no continuity between terminals 87A and 30. If OK, see Relay Circuit Test. If not OK, replace the faulty relay.

RELAY CIRCUIT TEST

1. The relay common feed terminal cavity (30) is connected to fused battery feed. There should be battery voltage at the cavity for relay terminal 30 at all times. If OK, go to Step 2. If not OK, repair the open circuit to the fuse in the PDC as required.
2. The relay normally closed terminal (87A) is not used in this application. Go to Step 3.
3. The relay normally open terminal cavity (87) is connected to the compressor clutch coil. There should be continuity between this cavity and the A/C compressor clutch relay output circuit cavity of the compressor clutch coil wire harness connector. If OK, go to Step 4. If not OK, repair the open circuit as required.
4. The relay coil battery terminal (86) is connected to the fused ignition switch output (run/start) circuit. There should be battery voltage at the cavity for relay terminal 86 with the ignition switch in the ON position. If OK, go to Step 5. If not OK, repair the open circuit to the fuse in the junction block as required.
5. The coil ground terminal cavity (85) is switched to ground through the Powertrain Control Module (PCM) . There should be continuity between this cavity and the A/C compressor clutch relay control circuit cavity of the PCM wire harness connector C (gray) at all times. If not OK, repair the open circuit as required.

The battery must be fully-charged before performing the following tests.

1. Connect an ammeter (0 to 10 ampere scale) in series with the clutch coil terminal. Use a voltmeter (0 to 20 volt scale) with clip-type leads for measuring the voltage across the battery and the compressor clutch coil.
2. With the heater-A/C mode control switch in any A/C mode, and the blower motor switch in the lowest speed position, start the engine and run it at normal idle.
3. The compressor clutch coil voltage should read within two volts of the battery voltage. If there is voltage at the clutch coil, but the reading is not within two volts of the battery voltage, test the clutch coil feed circuit for excessive voltage drop and repair as required. If there is no voltage reading at the clutch coil, use a DRB scan tool and the proper Diagnostic Procedures for testing of the compressor clutch circuit. The following components must be checked and repaired as required before you can complete testing of the clutch coil:

• • Fuses in the junction block and the Power Distribution Center (PDC)
  • Heater-A/C mode control switch
  • Compressor clutch relay
  • Electronic clutch cycling switch
  • High pressure cut-off switch
  • Low pressure cut-off switch
  • Powertrain Control Module (PCM) .

1. The compressor clutch coil is acceptable if the current draw measured at the clutch coil is 2.0 to 3.9 amperes with the electrical system voltage at 11.5 to 12.5 volts . This should only be checked with the work area temperature at 21 °C (70 °F) . If system voltage is more than 12.5 volts , add electrical loads by turning on electrical accessories until the system voltage drops below 12.5 volts .

• 1. If the clutch coil current reading is four amperes or more, the coil is shorted and should be replaced.
  2. If the clutch coil current reading is zero, the coil is open and should be replaced.