A/C - Blows Warm Air

Article No. 86-15-2


AIR CONDITIONING - BLOWS WARM AIR - VEHICLES EQUIPPED WITH AUTOMATIC TRANSMISSION
- AXOD/ATX - 2.5L/3.0L


NO START - LOW STATE OF BATTERY CHARGE - VEHICLES EQUIPPED WITH AUTOMATIC TRANSMISSION - AXOD/ATX - 2.5L/3.0L


FORD 1986 TAURUS

LINCOLN-MERCURY 1986 SABLE

An open circuit in the fan low speed dropping resistor can cause high A/C pressures that may be vented through the pressure release valve. This condition can cause poor A/C output. Use the following steps to diagnose and correct this condition.
1. With the engine running, turn on the A/C and check that the engine cooling fan is operating at low speed. If the fan is operating correctly, refer to the Taurus/Sable Shop Manual, Section 36-32, to correct poor A/C output. If the low speed fan does not operate, go to Step 2.

Figure 1:

2. Turn ignition off and disconnect the Integrated Relay Controller Module (IRCM). Refer to Figure 1 for IRCM location.

Figure 2:

Measure the voltage at pins 1A, 4A and 7A on the harness side of IRCM connector to battery ground. See Figure 2 for pin locations.

If all three voltage readings are 10.5 volts or higher, perform EEC IV diagnostics in the 1986 Shop Manual, Volume H.

If the voltage at pins 1A and 4A is less than 10.5 volts check for an open circuit between the IRCM harness connector and battery power.

If the voltage at pin 7A is less than 10.5 volts, go to Step 3.

Figure 3:

3. Locate the engine cooling fan dropping resistor mounted on the transaxle under the air cleaner. See Figure 3 for location. Check that the connector is fully connected. Recheck the voltage at pin 7A; if voltage is 10.5 volts or above, go to Step 6; if voltage is less than 10.5 volts, go to Step 4.

Figure 4:

4. Unplug the dropping resistor connector and using Rotunda Digital Volt-Ohmmeter 007-00001 measure the voltage between the negative side of the battery and the harness end of the connector. See Figure 4 for pin location. If the voltage is less than 10.5 volts, check for an open circuit between the harness connector and battery power. If the voltage is above 10.5 volts, go to Step 5.

5. Using Rotunda Digital Volt-Ohmmeter 007-00001 measure the resistance of the dropping resistor. If the resistance is less than 0.3 ohms, the resistor is good and the harness should be checked for an open circuit between the resistor and pin 7A. If the resistance is 0.3 ohms or greater, replace the resistor (E6DZ-8L603-C). After replacing the resistor, go to Step 6.

6. Recheck for low speed fan operation as outlined in Step 1 and check for proper A/C cooling. Recharge A/C as necessary.

PART NUMBER PART NAME CLASS

E6DZ-8L603-C Resistor Engine Cooling C

OTHER APPLICABLE ARTICLES: None
WARRANTY STATUS: Reimbursable within the provisions of the Warranty and Policy Manual.
OPERATION: SP8603A86
TIME: 0.4 Hr. DLR. CODING: Basic Part No. 8L603 - Code: 28