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Fix Motor Mount
Roll Cage Braces
Throttle Body 65mm
Wheel Alignment
Heat Riser Replacement
Vent Window Repair
Center Console Mount
Straighten Bumper
Ford 6R80 6 spd
More Tech...
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Heater question?
- Thread starter TOOL
- Start date
evil69
fawkin classy
Did you still run the power through the resistor?
oleguy74
Bronco Guru
evil69
fawkin classy
Possibly bad switch or resistor.
evil69
fawkin classy
Do you have a multimeter? Check the resistor for continuity and also check for power at the resistor. I think the red is power in (12 volts), the orange is power to motor (less than 12 volts).
oleguy74
Bronco Guru
look at post #4 above.
oleguy74
Bronco Guru
they are all about the same.resistor is on heater case.follow wires from motor.
oleguy74
Bronco Guru
the orange wire by-passes the res.red into res-red out of res red and orange tied together at out put of res.res may be open.as said by someone else here.may also a bad sw.
Broncobowsher
Total hack
- Joined
- Jun 4, 2002
- Messages
- 34,884
off-high-high
Someone bypassed the resistor
off-off-high
Resistor is not working or a bad switch
To test the resistor, put in low fan speed and check voltage at both terminals. The wire from the switch should be just under battery voltage, say 12V. Voltage on the other terminal should be 9V or so. Anything under 12V really. If both sides of the resistor are the same, there is bad wiring from the resitor to the motor. If both sides are 0V it is a bad switch or bad wiring to the switch.
Someone bypassed the resistor
off-off-high
Resistor is not working or a bad switch
To test the resistor, put in low fan speed and check voltage at both terminals. The wire from the switch should be just under battery voltage, say 12V. Voltage on the other terminal should be 9V or so. Anything under 12V really. If both sides of the resistor are the same, there is bad wiring from the resitor to the motor. If both sides are 0V it is a bad switch or bad wiring to the switch.
