Question about 1995 Ford Escort

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96 Escort Wagon 1.9 when the key is off the Blower motor, front and back wipers still have power. also the A/C lite comes on. Checked and changed the fuses.

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blowers have direct battery voltage all the time when the key is turned on. The resister, switch or relay supplies a ground. Turn the key on and the blower motor on. There will be two wires going down to the motor. Check the power relay in the power distibution center. This supplies power to the motor and the switch... The wire that plugs in to the motor. It is located at the motor. RELAY TEST
The blower motor relays used for the front heater-only or heater-A/C systems and for the optional rear heater-A/C unit can be tested in the same manner. The front blower motor relay is located in the Power Distribution Center (PDC) . The rear blower motor relay is located in a connector that is attached to the back of the rear heater-A/C unit. (Refer to HEATING & AIR CONDITIONING/CONTROLS/BLOWER MOTOR RELAY - REMOVAL) for the procedures to remove the relay, 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 in the Diagnosis and Testing. If not OK, replace the faulty relay.
RELAY CIRCUIT TEST
  1. The relay common feed terminal cavity (30) is connected to fused battery feed directly from a fuse in the Power Distribution Center (PDC), and should be hot at all times. Check for battery voltage at the PDC cavity for relay terminal 30. If OK, go to Step 2. If not OK, repair the open circuit to the PDC fuse as required.
  2. The relay normally closed terminal cavity (87A) is not used for this application. Go to Step 3.
  3. The relay normally open terminal cavity (87) is connected to the blower motor. When the relay is energized, terminal 87 is connected to terminal 30 and provides full battery current to the blower motor feed circuit. There should be continuity between the PDC cavity for terminal 87 and the blower motor relay output circuit cavity of the blower motor wire harness connector at all times. If OK, go to Step 4. If not OK, repair the open circuit to the blower motor as required.
  4. The coil battery terminal cavity (86) is connected to the ignition switch. When the ignition switch is placed in the ON position, fused ignition switch output is directed from a fuse in the junction block to the relay electromagnetic coil to energize the relay. There should be battery voltage at the PDC 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 junction block fuse as required.
  5. The coil ground terminal cavity (85) is connected to ground. This terminal supplies the ground for the relay electromagnetic coil. There should be continuity between the PDC cavity for relay terminal 85 and a good ground at all times. If not OK, repair the open circuit as required.
------- also check the blue wire from the ignition switch to the blower motor. If there is power at the wire coming off the switch on the blue wire, and no power at the blower motor on the blue wire, than there is a open in the wire.replace the wire in that case.
You will find that there is a A/C relay under the dash or in the electrical panel under the hood, that controls the blower motor. check out and Replace that relay . ------- You will have to use a volt meter and start testing the circuit beginning at the fuse block. Connect your neg lead to the frame, and then test the wire that leaves the fuse block and goes to the switch. test the voltage at the Line side of the switch.
The most common problem is the switch contacts burn out or the resistor burns out. If you find 12 volts on one of the wires at the switch, then replace the switch .
This will help.Thanksplease keep updated.please do rate the solution if helped.thank you for using fixya.

Posted on Feb 05, 2010

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