Relay to control blower speed

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Forum Name: General Discussion
Forum Discription: General Mobile Electronics Questions and Answers
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=40908
Printed Date: September 14, 2025 at 4:31 AM

Topic: Relay to control blower speed

Posted By: merplastic
Subject: Relay to control blower speed
Date Posted: October 14, 2004 at 8:13 PM

I'm trying to design a circuit to control my blower speed manually for my HVAC system in an 91 vette. I bought a relay and a rheostat but, not now I'm totally confused and dont really have a clue what to do next. I would appreciate any help in this matter.

Replies:

Posted By: flynntech
Date Posted: October 14, 2004 at 9:29 PM

Try a multi position switch with the resistor coils from a car in the JY.

in my car the blower swtich grounds the relay in any position other than off. Each different position routes the positive side through a different sized coil (resistor) which is inside the blower duct, probably for temp correction reasons...I'm not really sure. Anyways, the relay allows current to the motor, the switch choses different paths for it to take.

Posted By: merplastic
Date Posted: October 15, 2004 at 9:22 AM

thanks flynntech. my JY is only a couple miles away.

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