Pinpoint Test O: The Blower Motor Operates Continuously In High Speed - Manual Climate Control
WARNING: This page is about a different car, the 2005 Ford Pickup, 2005 Ford F550 Super Duty, 2005 Ford F450 Super Duty, and 2005 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
- O1 CHECK THE FUNCTION SELECTOR SWITCH
- Key in ON position.
- Set the blower motor speed to maximum.
- Check for blower motor operation in each function selector switch position.
- Does the blower motor operate in all of the function selector positions except OFF?
- Yes : GO to O2.
- No : GO to O3.
- O2 CHECK CIRCUIT 261 (OG/BK) FOR A SHORT TO GROUND
- Key in OFF position.
- Disconnect: Blower Motor C1031.
- Disconnect: Blower Motor Resistor C1032.
- Disconnect: Blower Motor Switch C294c.
- Measure the resistance between blower motor connector C1031, circuit 261 (OG/BK) and ground.
- Is the resistance greater than 10,000 ohms?
- Yes : INSTALL a new blower motor switch. REFER to CONTROL COMPONENTS . TEST the system for normal operation.
- No : REPAIR circuit 261 (OG/BK) for a short to ground. TEST the system for normal operation.
- O3 CHECK CIRCUIT 399 (BN/YE) FOR A SHORT TO GROUND
- Key in OFF position.
- Disconnect: Function Selector Switch C294a.
- Disconnect: Blower Motor Relay.
- Measure the resistance between function selector switch connector C294a pin 3, circuit 399 (BN/YE) and ground.
- Is the resistance greater than 10,000 ohms?
- Yes : INSTALL a new function selector switch. REFER to CONTROL COMPONENTS . TEST the system for normal operation.
- No : REPAIR circuit 399 (BN/YE) for a short to ground. TEST the system for normal operation.