Electric fan swap temperature switches

[Algershick]

Most automotive relays will work fine on 24V so that should be an issue.

The temp switches go to ground when the reach temp. Should be easy to check if they are working with an Ohm meter.

Thanks. When it warms up a bit more I'll bring the car up to temp and check if they're working.I don't know why I didn't think to do that last night.

 

[Algershick]

Switches are indeed grounding when they should. I pulled 1 relay and probed my 12v keyed power at the socket and saw something strange... 5v. Apparently there is a big voltage drop when something is plugged into it, however with no load it shows alternator voltage. I honestly don't know what that power source was for, its from a plug that was just dangling on the drivers side of my engine bay.

Good news is after I found a different switched 12v source, the fans come on right when they should and appear to shut off at about 185 or so.

 

[Algershick]

A buddy of mine is at a show and just texted a pic of a GN with the hood popped. I found the plug that had the keyed power I used initially. Looks like its going to a cruise control servo which isn't on my car.

 

[olds307 and 403]

I went though quite a few of the intake switches, a couple of different brands as well. I like the idea of two different senders at different turn on/off temps.

 

[Algershick]

I went though quite a few of the intake switches, a couple of different brands as well. I like the idea of two different senders at different turn on/off temps.

I must have lucked out, both switches appear to work. My only issue was my poor choice of 12v power!

 

[olds307 and 403]

I must have lucked out, both switches appear to work. My only issue was my poor choice of 12v power!

Carry spares, mine usually died at the track or somewhere inconvenient.

 

[Algershick]

I'm thinking about installing some toggle switches just in case.

 

[pontiacgp]

I must have lucked out, both switches appear to work. My only issue was my poor choice of 12v power!

I had bad luck with every thermal switch I put in so I have the adjustable Flex-a-Lite and that is working great

 

[Doug213xrj]

one other thing I would do is to turn the fans on when you turn the AC on if you have AC. As far as switches I didn't have good luck with the thermal switches so I put in an adjustable. I have both fans turn on the same time but you'd need two units to run the fans independent of each other.

https://www.summitracing.com/int/parts/der-16769/overview/

[/QUOTE

one other thing I would do is to turn the fans on when you turn the AC on if you have AC. As far as switches I didn't have good luck with the thermal switches so I put in an adjustable. I have both fans turn on the same time but you'd need two units to run the fans independent of each other.

https://www.summitracing.com/int/parts/der-16769/overview/

Yea, Did you run both fan off on one adjustable controller or two one for each fan, Also does it draw a lot of power when both turn on at the same time.

Thanks Doug

 

[pontiacgp]

Yea, Did you run both fan off on one adjustable controller or two one for each fan, Also does it draw a lot of power when both turn on at the same time.

Thanks Doug

I run both fans from one controller