65 heater switch - Ford Mustang Forum
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post #1 of 10 (permalink) Old 09-16-2019 Thread Starter
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65 heater switch

So my 3 speed heater switch and heater motor are not plugged into resistor and wired to who know where.So I bought a new switch thinking I would just start over.The new switch is about a foot long.Am I missing something here?My understanding is it plugs into the resistor directly and one wire from the motor too
.thanks Smitty

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post #2 of 10 (permalink) Old 09-16-2019
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Not saying it's not possible but I don't recall '65s coming with a 3 speed heater motor (they came on the Comet, Falcon, etc.). My '66 is only a 2 speed: off (not a speed), low and high. My switch plugs into one end of the harness while the other end plugs into the resistor unit. My blower motor has 2 wires: one for low speed and one for high speed. The

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post #3 of 10 (permalink) Old 09-17-2019
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For Your info from CJ Pony Mustang site:
1965-1966 Mustang 3-Speed Heater Blower Motor Switch

This 3-Speed Heater Blower Motor Switch only fits 1965-1966 Mustangs that were built after 4/1/65. Earlier Mustangs used a 2-speed switch.

https://www.cjponyparts.com/heater-b...5-1966/p/HBS1/




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post #4 of 10 (permalink) Old 09-18-2019 Thread Starter
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After playing with the blower switch and it is a 2 speed. So now I need to figure out why no wires to resistor? 2 wires from motor goes threw firewall and will see what the heck it's going too.All I know is its doesn't blow now, but I did test it directly to battery and blows well.
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post #5 of 10 (permalink) Old 4 Weeks Ago
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Heater boxes in a 64 never had a resistor on them.
Maybe it has been wired to bypass the resistor like in the early cars.
How many wires coming out of the heater motor?

15/5/1964 260 Manual Coupe.
23/3/1965 289 Manual Fastback.
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post #6 of 10 (permalink) Old 4 Weeks Ago
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Heater Blower Motor Switch Resistor is installed inside the heater box plenum.

Here is diagram (schematic) of 65:

http://averagejoerestoration.com/res...rams/1965i.jpg

Note 2 different switches; 2 speed and 3 speed.

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post #7 of 10 (permalink) Old 4 Weeks Ago Thread Starter
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2 wires out brown and yellow.
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post #8 of 10 (permalink) Old 4 Weeks Ago Thread Starter
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Ok so no wires go to resistor? As mine has none.Dont know if it matters but have a aftermarket ac.
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post #9 of 10 (permalink) Old 4 Weeks Ago Thread Starter
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I went through everything. So blower motor 2 wire works off battery, wires too blower are good.2 speed switch when plugged in and turned on shows power to all 3 wires,fuse good.car has no wires to resistor. And lastly too get power too blower wires car must be running, but power to switch just need key turned on.if all else fails can I somehow rewire blower to switch? Thanks Smitty
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post #10 of 10 (permalink) Old 3 Weeks Ago
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Had a similar situation. Found out that car came with two speed blower, but someone changed the entire heater box with a three speed one with a resistor and two wire motor. I wired one wire from the switch to the motor and the other motor wire directly to ground. I have a one speed blower until I change the motor...



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