3 Relay Automotive Cooling Fan Logic

Рет қаралды 7,580

Күн бұрын

Trying to demystify the 3 relay setup for hi/low speed fans. It's really not as hard as it looks.
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Пікірлер: 30

@TheTruthBeToId 10 ай бұрын

Dude my head was fuming on trying to make this work like thing. THANK YOU for having my solution before my head exploded.

@RustyWrenches 9 ай бұрын

You bet. It still bends my mind a little.

@bhwjrproductions 2 жыл бұрын

I’ve had this 3 fan relay setup on my car for a couple of years, it’s been on the road full time for the last few months and it’s working great. The wiring diagram I used I found online. My LS computer controls the fans and I have a manual over ride switch that I never finished connecting because the computer controls seems to be perfect. I still have to figure out how to get the AC to trigger the fans.

@RustyWrenches 2 жыл бұрын

I also thought about adding a manual override as well. Maybe someday. I'm really hoping the pressure switch will work with my setup so the ECM will control the fans for the ac. We will find out soon! Thanks for watching!

@konstantin-big 10 күн бұрын

If you have that diagram you can connect a switch 1- wire to 3-relay pin 86 the other wire you connect to ground When you activate the switch both fans works on high speed

@bhwjrproductions 9 күн бұрын

@ Yes this 3 relay setup runs the fans both full speed or half speed. My car never runs more than 195° even with the AC on in stop and go traffic so the high speed never turns on except when I tested it to make sure it worked

@konstantin-big 9 күн бұрын

@@bhwjrproductions Ok

@tuanas458 8 ай бұрын

87a is for use like(for example) day time running lights which are automatically on when you turn on your car. And obviously it turns off(of become low powered) once you switch to the main headbeams. You can leave 87a open and not hooked up to anything.

@RustyWrenches 6 ай бұрын

In this case it's needs on the 3rd relay to allow a current path through both fans in series.

@konstantin-big 10 күн бұрын

In relay nr 1 & 3 he don't use=connected wires on pin 87A In relay nr 2 there is a wire connected to pin 87A

@samisulaiman7967 Жыл бұрын

I have a Suburban 2012 and I want to make both of the fan run on high speed all time and I have 4 relays with 5 pins can you show me the diagram thanks in advance

@RustyWrenches Жыл бұрын

That’s a good question. I don’t have an answer on that. You might try calling Current Performance. I know they do a lot with tan wiring.

@ibanez741852 Жыл бұрын

The fatal flaw shouldn't be a concern. If you have 12v on both sides of the fan it's an open circuit so current won't flow. There is no ground. If you touch 2 wires to positive and touch them together on the other end, nothing happens. Electricity is trying to take the shortest path to ground. Now if that first relay was shorted to criund before 30 and the second relay was not functioning it would turn the fan backwards but what are the odds lol Great video though!

@RustyWrenches Жыл бұрын

Fair point. Thanks for watching!

@konstantin-big 10 күн бұрын

You are wrong fan nr F1 haven't power so that can't works If first relay is the left relay