Retrofit Electric Engine Cooling Fans

[TRAZOII]

Ok, so from what I'm getting from this thread is.....
Hi and low will both run off of 2 separate 40 amp relays. Correct? I'd rather over do it than blow relays. Secondly, what would you use for a controller? I would like to utilize both fans on temp switches with a override on for the a/c or towing.

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[Honky Kong jr]

Ok, so from what I'm getting from this thread is.....
Hi and low will both run off of 2 separate 40 amp relays. Correct? I'd rather over do it than blow relays. Secondly, what would you use for a controller? I would like to utilize both fans on temp switches with a override on for the a/c or towing.

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I'm gonna use Ford style starter relays. They should be plenty sturdy enough.

 

[TRAZOII]

I'm gonna use Ford style starter relays. They should be plenty sturdy enough.

Make sure you get the continuous duty relays. Starter relay will burn out. I learned the hard way with adding a battery.

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[Camar068]

Really need to find out what the highest amperage of each fan is. If there's a spike at starting or turning off, you can put in a thermistor to clip it to "normal-running" amperage. Then add say 5-10 amps to the "normal-running" and that's the relay I would use. I decided to use the same relays they use in GM vehicles. They don't cost as much as you think, if you order them online. Thermistors are about $1.50 each.

 

[TRAZOII]

Really need to find out what the highest amperage of each fan is. If there's a spike at starting or turning off, you can put in a thermistor to clip it to "normal-running" amperage. Then add say 5-10 amps to the "normal-running" and that's the relay I would use. I decided to use the same relays they use in GM vehicles. They don't cost as much as you think, if you order them online. Thermistors are about $1.50 each.

Got a link?

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[Camar068]

Post #72 has the links for both.

http://www.gmsquarebody.com/threads/86-k10-5-3-swap.15397/page-5

 

[Djgiann99]

Maybe I'm just missing it, but what is everyone using for a triggering sensor? I read a couple guys using a temp sensor in the head. I wanted to use a two speed/fan setup with one fan (or low speed) kicking on at a lower temp and the other (or high speed) kicking on at a higher temp. This would require me to have two separate sensors which turn on at different temperatures. Is this the easiest way? Are there junkyard sensors that can be retrofitted? What else is everyone doing?