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Old 12-14-2009, 07:33   #1 (permalink)
1993 F-250 plow truck
 
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heater switch / relay?

On my '93 F-250, the blower motor is either off or on HIGH. MED & LOW do not work at all. I pulled the switch and tested it at work today, it looks like the switch is good. A guy at work told me there is an in-line heater blower realy under the dash some place. Anyone able to send me off in the right direction?
I just picked this truck up in September and have been going over neglected maint items, getting it ready to work.
I'll stop and pick up a shop manual, as it is replacing a 1985 F-350 that rotted out from under me after 24 years of plow duty. I hope this one lasts a good long time, no plates or insurance, for use on my property only, plowing, hauling wood etc.
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Old 12-14-2009, 08:10   #2 (permalink)
2002 F150 XLT
 
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Re: heater switch / relay?

The blower resistor is normally the cause. It's mounted next to the blower on the heater box on the engine side.
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Old 12-15-2009, 09:50   #3 (permalink)
2002 F150 XLT
 
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Re: heater switch / relay?

Here's the picture from the Ford manual. See if this helps. Your picture is correct. Just the plug will be seen.
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File Type: jpg Resistor.jpg (231.4 KB, 12 views)
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Old 12-15-2009, 10:29   #4 (permalink)
1993 F-250 plow truck
 
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Re: heater switch / relay?

Thank you Bert! Like I said, I probaly had my hands on it 6 times and couldn't see the forest through the trees!
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Old 12-15-2009, 10:59   #5 (permalink)
2002 F150 XLT
 
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Re: heater switch / relay?

You're welcome. Sometimes you'll find a plastic type boot around it, so it's hard to pick out.
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Old 12-16-2009, 08:22   #6 (permalink)
1993 F-250 plow truck
 
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Mission accomplished!

Geeze that resistor was burried way down in there! I don't know how anyone with hands bigger than mine could even get close enough to fit the socket on the screw heads. I now have all speeds for heating & a/c.
The schematic hepled for sure!
FYI, I paid $21 at Ford when I picked up my PSD last night, NAPA wanted $24.
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Old 12-16-2009, 11:02   #7 (permalink)
2002 F150 XLT
 
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Re: heater switch / relay?

I guess they don't expect them to go out. Glad you got it fixed.
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