heater resistor
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heater resistor
[font size="1" color="#FF0000"]LAST EDITED ON 07-Jan-01 AT 12:35 PM (EST)[/font][p]Anybody know the location of the heater resistor on a 78 F150 and the readings I should get in testing???? I am finally getting around to finishing my heater replacement. have new Blower installed and the switch has power in and out but no heat still......
Must be the resistor I guess. I thought that was a real good place to start checking anyway.
Thanks for all the help!!
Chris
1978 F150 SC 351 C6 $1000
Soon to be Bronc owner!!
1969 Buick LeSabre 400
1941 Farmall "A"
Must be the resistor I guess. I thought that was a real good place to start checking anyway.
Thanks for all the help!!
Chris
1978 F150 SC 351 C6 $1000
Soon to be Bronc owner!!
1969 Buick LeSabre 400
1941 Farmall "A"
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Posts: 472
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From: USA
heater resistor
bronclover,
The heater resistor is on the heater box/plenum and attaches with two 5/16" self-tapping screws. It has three flat spade connectors, and the wires go from it to the heater blower switch. If the resistor and/or its wires are bad, the blower motor will work on HI only (resistor cuts down voltage to slow blower motor).
Art
The heater resistor is on the heater box/plenum and attaches with two 5/16" self-tapping screws. It has three flat spade connectors, and the wires go from it to the heater blower switch. If the resistor and/or its wires are bad, the blower motor will work on HI only (resistor cuts down voltage to slow blower motor).
Art
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heater resistor
Right now the heater doesn't blow at all.....going out now and put in the new core and will double check all connections again.....maybe the ac control cable is off and it is on ac that will turn off the heat but not the blower though.....I dunno what is wrong.maybe I unplugged something somewhere and missed it on the reinstall?????
1978 F150 SC 351 C6 $1000
Soon to be Bronc owner!!
1969 Buick LeSabre 400
1941 Farmall "A"
1978 F150 SC 351 C6 $1000
Soon to be Bronc owner!!
1969 Buick LeSabre 400
1941 Farmall "A"
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heater resistor
OK here is the deal..... I have a good ground. I have power in the wire that comes hot when the heat is turned on. The switch is operating. I have power at the three wire connector that goes to the resistor. But, when I hook it all up nothing. If I just jump from the hot when heat is on and to ground the fan blows on high, but nothing when it is all hooked up...........I am pulling my hair out here!! ( what little is left!) What kind of readings should I lget on the resitor to see if it is good or bad????? It seems that this can be the only thing left to mess me up. unless I am hooking something up wrong.
I should have the three wire connector which is a no brainer and the hot that comes on when the heat is on........correct????
This resistor is a dealer item and I just don't have time now to scrounge in the yards. Besides, 73-79's w/air are rare in the yards here!
HELP!!
Thanks!!!
1978 F150 SC 351 C6 $1000
Soon to be Bronc owner!!
1969 Buick LeSabre 400
1941 Farmall "A"
I should have the three wire connector which is a no brainer and the hot that comes on when the heat is on........correct????
This resistor is a dealer item and I just don't have time now to scrounge in the yards. Besides, 73-79's w/air are rare in the yards here!
HELP!!
Thanks!!!
1978 F150 SC 351 C6 $1000
Soon to be Bronc owner!!
1969 Buick LeSabre 400
1941 Farmall "A"
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Joined: Sep 2000
Posts: 99
Likes: 1
heater resistor
If you have power coming off the resistor, It's unlikely that that is your problem. More likely, the relay for the blower motor is bad. I dont know if the relay is in the same location on a 78 as a 74, but look under the bottom lip of the dash board on the passengers side. It will have a 3 prong conector going to it and will be held on by 1 screw. I've had these go bad in the past, and the whole blower system shuts down.
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heater resistor
Thanks will check that out.....there must be something else there somewhere!! Thanks to all for the help.....will let you know if that works.
Chris
1978 F150 SC 351 C6 $1000
Soon to be Bronc owner!!
1969 Buick LeSabre 400
1941 Farmall "A"
Chris
1978 F150 SC 351 C6 $1000
Soon to be Bronc owner!!
1969 Buick LeSabre 400
1941 Farmall "A"
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heater resistor
>[font size="1" color="#FF0000"]LAST EDITED ON 07-Jan-01
>AT 12:35 PM (EST)[/font]
>
>Anybody know the location of the
>heater resistor on a 78
>F150 and the readings I
>should get in testing????
>I am finally getting around
>to finishing my heater replacement.
> have new Blower installed
>and the switch has power
>in and out but no
>heat still......
>Must be the resistor I
>guess. I thought that
>was a real good place
>to start checking anyway.
>Thanks for all the help!!
>Chris
>
>1978 F150 SC 351 C6
>$1000
>Soon to be Bronc owner!!
>1969 Buick LeSabre 400
>1941 Farmall "A"
>AT 12:35 PM (EST)[/font]
>
>Anybody know the location of the
>heater resistor on a 78
>F150 and the readings I
>should get in testing????
>I am finally getting around
>to finishing my heater replacement.
> have new Blower installed
>and the switch has power
>in and out but no
>heat still......
>Must be the resistor I
>guess. I thought that
>was a real good place
>to start checking anyway.
>Thanks for all the help!!
>Chris
>
>1978 F150 SC 351 C6
>$1000
>Soon to be Bronc owner!!
>1969 Buick LeSabre 400
>1941 Farmall "A"
Freshman User
Joined: Jan 2001
Posts: 34
Likes: 0
heater resistor
I had the same problem with my heater and traced all the things you did, but I eventually found that the heater/ac relay went bad..It is a small metal relay box affixed the the underside of the right side dash, with a self tapper screw.The box is just about straight down from the left side of the glove box...
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