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post #1 of 7 (permalink) Old 01-03-2010, 12:25 AM Thread Starter
 
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Heater fan

Heater fan switch works on low and high no inbetween settings this a relay or fuse problem or ?

also the switch for hot or colder temps when moved up a bit from thehottest setting to cooler temp setting its a huge temp change just luke warm air unless all the way on hot then you could cook a turkey in here lol this just a diesel thing ? or ?


thanks



2007 F350 6.0L Ext cab short box 4x4
2000 F150 5.4L Reg cab short box 2wd
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post #2 of 7 (permalink) Old 01-03-2010, 06:02 PM
 
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I don;t know what your issue is with the fan speed unless mabe the switch has started to come apart at the back. They are 2 pieces that snap together.
I do know that on my 2007, the heater is not very linear on the temp control even though my past SD's very very accurate and yes, a small movement off of the hottest position makes a huge difference in temp.
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post #3 of 7 (permalink) Old 01-03-2010, 08:31 PM
 
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I forget the official term for it, but if you look under the hood and go to the heater box, you'll see the blower motor and there is also a "thermal coil pack" that is inside the housing of the heater box. Just follow the wires to it (usually 3 or 4 that go into a plug) and unplug it, then take the coil out (usually 1 or 2 screws). If you look closely at the unit you'll see a few coils of wire that have different thicknesses. Each one of those coils is for each speed of the fan, and if one of those coils has a break in it, that circuit will open and fan will stop for that particular speed. Check this first.


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post #4 of 7 (permalink) Old 01-03-2010, 09:19 PM Thread Starter
 
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Quote:
Originally Posted by Fordsforever6.0 View Post
I forget the official term for it, but if you look under the hood and go to the heater box, you'll see the blower motor and there is also a "thermal coil pack" that is inside the housing of the heater box. Just follow the wires to it (usually 3 or 4 that go into a plug) and unplug it, then take the coil out (usually 1 or 2 screws). If you look closely at the unit you'll see a few coils of wire that have different thicknesses. Each one of those coils is for each speed of the fan, and if one of those coils has a break in it, that circuit will open and fan will stop for that particular speed. Check this first.

Thanks for the info i will check it out



2007 F350 6.0L Ext cab short box 4x4
2000 F150 5.4L Reg cab short box 2wd
?? always looking for a new ford project !
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post #5 of 7 (permalink) Old 01-03-2010, 09:38 PM
 
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Quote:
Originally Posted by Fordsforever6.0 View Post
I forget the official term for it, but if you look under the hood and go to the heater box, you'll see the blower motor and there is also a "thermal coil pack" that is inside the housing of the heater box. Just follow the wires to it (usually 3 or 4 that go into a plug) and unplug it, then take the coil out (usually 1 or 2 screws). If you look closely at the unit you'll see a few coils of wire that have different thicknesses. Each one of those coils is for each speed of the fan, and if one of those coils has a break in it, that circuit will open and fan will stop for that particular speed. Check this first.


Blower motor resistor


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post #6 of 7 (permalink) Old 01-03-2010, 10:51 PM
 
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do you have manuel switches or auto?if you have manuel switches could be the blend door motor or door itself,just lower the glove box and on top of the heater plenum is an actuator,while moving switch hot/cold watch to see if motor moves smooth.


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post #7 of 7 (permalink) Old 01-03-2010, 11:01 PM Thread Starter
 
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thanks for all the info

i have the manual 3 sep switches for the blower/heat,cool/settings



2007 F350 6.0L Ext cab short box 4x4
2000 F150 5.4L Reg cab short box 2wd
?? always looking for a new ford project !
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