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New way to control the fan for your HVAC system

Buckminster

Well-Known Member
Joined
May 18, 2019
Messages
75
Reaction score
33
Location
Fenton, MO
All,
My Blower switch disintegrated recently after I rebuilt my HVAC box when I went to reinstall the connector to the switch. When I went to find one, I was dismayed to see the price of that switch. I saw some asking as much as $290 for that switch alone. My project is a Resto-Mod, so I wasn't worried so much about being stock as being functional. To solve the problem, I got a little creative. I found a Pulse Width Modulated DC power supply/dc motor controller on Amazon for about $15. So now I have infinitely variable speed control on my blower motor and simplified the wiring by removing the resistors from the HVAC box. I wanted to use the existing blower switch location so there wasn't an open hole where the original switch was, so I then found a lighted Slide potentiometer on NEWARK for about $3. I wired the speed controller direct to the Blower motor and the slide switch I installed in place of the old blower motor switch on the HVAC control panel. It works like a champ and with the LED on the tip of the switch I'm one step closer to a more modern looking dash. My sincere apologies to all the purest out there. The LED runs off of 2.5V so I looked to Amazon again for the solution. The LED is very bright at the moment because it is running off a 3V battery for the photo. The fuse box is from Painless Wiring. The previous owner removed the OEM harness and fuse box and this came along with the car.
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I'm waiting for the adjustable Power Supply to arrive from Amazon. For about $3. I purchased a DC converter that is infinitely adjustable from 0.8V to 12V. The LED optimum voltage is 2.1V, so I will be able to dim the LED to some degree. My car is green, so I went with Green accent lighting. The potentiometer switch comes in red, orange, green, amber and white so you can match the color to your car, if you so desire. Enjoy
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