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jtrashy Samba Member
Joined: November 27, 2005 Posts: 129 Location: SF, CA
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Posted: Sun Jul 22, 2018 3:46 pm Post subject: Switch size for radiator fan? |
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I want a switch on the ground of the radiator fan, how big should it be?
Thanks! |
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Ahwahnee Samba Member
Joined: June 05, 2010 Posts: 9797 Location: Mt Lemmon, AZ
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Posted: Sun Jul 22, 2018 4:24 pm Post subject: Re: Switch size for editor fan? |
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Are you wanting a switch to manually turn on the the fan?
I used the usual 'fog light' switch that fits into the dash pod (replacing a dummy in that slot). It is 2 position so I can select either of two speeds.
It has been a long time but I think it is just switching a relay, hence not much draw.
But switching the ground may require more an possibly only permit turning the fan off (overriding the thermo switch). |
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vanagonjon Samba Member
Joined: July 17, 2006 Posts: 230
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Posted: Mon Jul 23, 2018 8:01 am Post subject: Re: Switch size for radiator fan? |
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usually a switch on the ground side will disconnect the circuit and stop whatever you are controlling. You want a switch in parallel with the thermostat to override and run the fan when you want. There may be up to three fan speeds, so you need to decide which thermostat contact(s) you are overriding.
John |
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jtrashy Samba Member
Joined: November 27, 2005 Posts: 129 Location: SF, CA
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Posted: Mon Jul 23, 2018 12:51 pm Post subject: Re: Switch size for radiator fan? |
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I should have givien more info......
i trying to troubleshoot my running temp which is 193-195 when its hot so my fan is running for 6+ hours on the freeway which isnt buying me anything. So im only looking to turn it off when desired, not on
Whats the easiest way to turn the fan off ? my thought was a switch to the ground but im open to suggestions, easier the better as its somewhat temporary |
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Ahwahnee Samba Member
Joined: June 05, 2010 Posts: 9797 Location: Mt Lemmon, AZ
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Posted: Mon Jul 23, 2018 12:55 pm Post subject: Re: Switch size for radiator fan? |
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On my 84 the radiator fan has its own (16a red) fuse. It is in position 7.
Pulling that would shut it down. |
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jtrashy Samba Member
Joined: November 27, 2005 Posts: 129 Location: SF, CA
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Posted: Mon Jul 23, 2018 12:59 pm Post subject: Re: Switch size for radiator fan? |
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Simple, I like it
Ahwahnee wrote: |
On my 84 the radiator fan has its own (16a red) fuse. It is in position 7.
Pulling that would shut it down. |
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MarkWard Samba Member
Joined: February 09, 2005 Posts: 17110 Location: Retired South Florida
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Posted: Mon Jul 23, 2018 1:54 pm Post subject: Re: Switch size for radiator fan? |
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Hello, you don't specify your year, but the later vans with the "H" type fuses had a 30 amp radiator fuse. So in answer to your question, without adding a relay to the ground side, you'd need a switch that can handle 30 amps continuous. That should be a very expensive toggle switch. I think later vans with factory AC had a 50 amp blade fuse for the high speed. So, you'd need a switch capable of handling 50 amps continuous. _________________ ☮️ |
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shagginwagon83 Samba Member
Joined: February 07, 2016 Posts: 3794 Location: VA/TN
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Posted: Mon Jul 23, 2018 1:58 pm Post subject: Re: Switch size for radiator fan? |
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Could you not have a simple 12volt toggle switch to control the ground through a relay? Basically when the switch is sending 12volt to the relay, it bridges the ground connection. It would also save you from running very thick wires into the cab. _________________ Brandon
"Jo Ann" - '83.5 Westfalia EJ22e w/Peloquin
Instagram @joannthevan |
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vanagonjon Samba Member
Joined: July 17, 2006 Posts: 230
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Posted: Mon Jul 23, 2018 2:19 pm Post subject: Re: Switch size for radiator fan? |
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Not living in a really hot area (New England) I would think that if everything is working correctly on your van the fan should run at the speed required to keep the temperature at the correct range. If running the fan does not cool down the coolant sufficiently to stage down the fan speed, maybe something is wrong. I would not turn off a fan that was doing its job correctly. |
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