heater blower motor not working
#1
03-10-2013, 09:18 AM
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heater blower motor not working
Sorry for the new post. I have 79 f250 cab with No factory air. First I checked the fuse and got power there. Then I checked power at switch. I have power to the orange wire(with key on) and power to all other wires with key on or off. I'm guess that tells me the switck is good,right?. Where do I check next down the line?
#2
03-10-2013, 09:40 AM
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some heating element looking thing)but no power to motor wires.
#4
03-10-2013, 09:57 AM
Check for continuity through "element thing" or visually check to see if it is broken by pulling it out heater box .. check if it is fuse protected .. you can check blower fan by adding 12 volts to it
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03-10-2013, 10:09 AM
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#7
03-10-2013, 10:40 AM
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#9
03-10-2013, 11:08 AM
MOTORCRAFT Part # YH2 {#D3AH19A642AA, D3AH19A642BA, D3AZ19986A}
1978 FORD F-250 Blower Switch
1978 FORD F-250 Blower Motor Relay
The switches for blower motor speed have always been iffy however make sure relay works also..
1978 FORD F-250 Blower Switch
1978 FORD F-250 Blower Motor Relay
The switches for blower motor speed have always been iffy however make sure relay works also..
#10
03-10-2013, 11:09 AM
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#11
03-10-2013, 11:15 AM
yes .. all the switch does is limit the amount of juice going to the blower so if you test for juice on both sides of switch with it in an on position and you have power then check relay .. If you don't have power on both sides of switch when on then it is the switch ..
#12
03-10-2013, 11:24 AM
#13
03-10-2013, 11:29 AM
A '79 does not have a blower motor relay.
No, that's not what I'm pointing out, and the switch is not suspect.
Even if the switch is completely bad, the fan should still come on in LOW. By default, the entire blower motor resistor is in the path; all the speed switch does is jump taps in the blower motor resistor. The switch can be completely removed and the blower motor should still come on.
If you have power at the ORANGE wire going into the speed switch, but the blower motor does not even come in in LOW, then check the blower motor resistor for continuity.
No, that's not what I'm pointing out, and the switch is not suspect.
Even if the switch is completely bad, the fan should still come on in LOW. By default, the entire blower motor resistor is in the path; all the speed switch does is jump taps in the blower motor resistor. The switch can be completely removed and the blower motor should still come on.
If you have power at the ORANGE wire going into the speed switch, but the blower motor does not even come in in LOW, then check the blower motor resistor for continuity.
He already reported the resistor has continuity ..
Risister hase continuity.
#14
03-10-2013, 11:32 AM
That last post of mine that you quoted was in error; I wrote it assuming he has an A/C truck. He does not have an A/C truck, so I corrected myself (you will see the post has since changed). The wiring is different between the two. The OP stated in his first post that he has a '79. A '78 wouldn't have a blower motor relay either.
#15
03-10-2013, 11:33 AM
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