2 Radiator fans from one dual speed fan

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l33t_a2

Member - Posts: 4

Joined: January 24, 2006

Location: United States

Posted: January 25, 2006 at 1:21 AM / IP Logged

My car came with a single radiator fan which has two speeds.

It is broken and I am going to replace it with two separate single speed fans.

I want to wire the new ones up so that when the low speed should be on, I have one fan going. When the high speed should be on, I have both going.

I have 3 wires going to the stock fan motor.

Ground, 12v+ for low speed, 12v+ for high speed.

First fan: Ground, 12v from low speed, also 12v from high speed on the same wire.

Second fan: Ground, 12v from high speed. No backflow current from low speed fan.

Is this possible?

The fans are rated at 8 Amps, I could only find a diode rated for 6 amps. I dont even know for sure how diode ratings work. I know how to wire up a basic automotive relay, but thats about the extent of my experience.

The car is a 1990 VW Jetta GLI 16v. It is a daily driver as well as a weekend track car.

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Ween

Platinum - Posts: 1,366

Joined: August 01, 2004

Location: Illinois, United States

Posted: January 25, 2006 at 1:39 PM / IP Logged

hi,

this should work. bosch type SPDT relay. terminals as follows.

87A to low speed fan wire of vehicle

30 to low/high speed fan (fan 1)

87 & 86 to high speed fan wire and high speed fan (fan 2)

85 to ground and both fans ground leads

hope this helps

mark

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l33t_a2

Member - Posts: 4

Joined: January 24, 2006

Location: United States

Posted: January 25, 2006 at 9:31 PM / IP Logged

So youre saying this will work? thats what i got from reading your reply, thanks for the quick response.

2 Radiator fans from one dual speed fan -- posted image.

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Ween

Platinum - Posts: 1,366

Joined: August 01, 2004

Location: Illinois, United States

Posted: January 25, 2006 at 9:37 PM / IP Logged

the diagram drawn is correct except you need a jumper between terminals 87 and 86.

mark

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l33t_a2

Member - Posts: 4

Joined: January 24, 2006

Location: United States

Posted: January 25, 2006 at 9:40 PM / IP Logged

ok, and also, if by chance im overthinking this and the low stays positive even when the high goes hot, will that affect the relay setup ?

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l33t_a2

Member - Posts: 4

Joined: January 24, 2006

Location: United States

Posted: January 25, 2006 at 9:45 PM / IP Logged

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geepherder

Platinum - Posts: 3,668

This member consistently provides reliable information

Joined: October 27, 2003

Posted: January 26, 2006 at 2:43 PM / IP Logged

No, it won't hurt anything. That's what you want to happen.

My ex once told me I have a perfect face for radio.

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2 Radiator fans from one dual speed fan

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