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Tech Talk => Engine Mechanical / Electrical => Topic started by: jamiemwedmore1234 on January 13, 2017, 05:59:56 PM
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Not a boat but my 1981 c-10. I just wired up duel electric fans and used a 185* switch. My question is should I get a thermostat to match so they work together
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Little more detail the thermal switch that turns on the fan is regulated the turn on at 185 and turn off at 165. To me it seems off cause once the fan turns on it doesn't turn off
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I had the same on my 63 c-10. It didn't shit off unless I was in cold weather.
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Little more detail the thermal switch that turns on the fan is regulated the turn on at 185 and turn off at 165. To me it seems off cause once the fan turns on it doesn't turn off
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Carbureted?
You should be running a 180° thermostat. Where is the fan stat installed? If you can, mount it on the water pump.
Is the electric thermostat adjustable?
If EFI, you want a 190° stat.
GT
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Right now it's installed next to the thermostat no not adjustable I found a new one on summit rated 180-200 seems it would be better then the one I got the one I currently have is 165-185 I just don't see it ever cooling dwn to 165 I ran the truck for an hour and the fans stayed running and it's 50*outside
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Carbureted?
You should be running a 180° thermostat. Where is the fan stat installed? If you can, mount it on the water pump.
Is the electric thermostat adjustable?
If EFI, you want a 190° stat.
GT
and it is carbureted
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Right now it's installed next to the thermostat no not adjustable I found a new one on summit rated 180-200 seems it would be better then the one I got the one I currently have is 165-185 I just don't see it ever cooling dwn to 165 I ran the truck for an hour and the fans stayed running and it's 50*outside
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Why do you want it to shut off?
I don't understand.
When I do electric, I use two switches. With a bypass switch if you have AC.
One on the stat, typically cuts in at 180° and out at 165°, the second either in the radiator down low or in the water pump that cuts in at 160° and out at 150°. These would be installed in series. The air conditioner would be on a switch around both and would be on the high side of the compressor.
The one that would cut it off going down the road would be the water pump one. The water leaving the thermostat will always be at or above 180°.
It will seldom cycle at idle like a four cylinder because of the added mass.
Who's kit?
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You could also install the electric stat in the head.
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Why do you want it to shut off?
I don't understand.
When I do electric, I use two switches. With a bypass switch if you have AC.
One on the stat, typically cuts in at 180° and out at 165°, the second either in the radiator down low or in the water pump that cuts in at 160° and out at 150°. These would be installed in series. The air conditioner would be on a switch around both and would be on the high side of the compressor.
The one that would cut it off going down the road would be the water pump one. The water leaving the thermostat will always be at or above 180°.
It will seldom cycle at idle like a four cylinder because of the added mass.
Who's kit?
i thought it should cycle on and off
As far as a kit it's bits and pieces from other builds I had layer around figured it would be better then the clutchless fan I had mounted to the water pump. No a/c yet but when that happens I will definitely wire it up as so
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Little more detail the thermal switch that turns on the fan is regulated the turn on at 185 and turn off at 165. To me it seems off cause once the fan turns on it doesn't turn off
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I'm assuming you mean when the motor is shut off... ?
It will depend on WHERE the temp switch is located. If it's somewhere on the engine... then even with the fans going, all they are going to do is cool off the radiator coolant since the water is not circulating... so the engine will be above 165 for quite a while.
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I always just run the fan on switch a few degrees above the thermostat temp... that way they kick on after the water starts circulating. And x2 on the a/c kick on.
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I'm assuming you mean when the motor is shut off... ?
It will depend on WHERE the temp switch is located. If it's somewhere on the engine... then even with the fans going, all they are going to do is cool off the radiator coolant since the water is not circulating... so the engine will be above 165 for quite a while.
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I read it as at idle.
The power to the relay Sikhs be cut off with the ignition. No reason at all to run a fan when the engine is off.
JMO
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I read it as at idle.
The power to the relay Sikhs be cut off with the ignition. No reason at all to run a fan when the engine is off.
JMO
I mean that certainly makes sense... but he didn't say with the ignition off... and the only time I think they would turn off if the off setting was at that low below the thermostat... idle or whatever, would be if the engine is off.
Did that read like I was thinking it in my head?😜
I mean with a 180 stat... and the off on the fan is 165... it should never turn off unless the ignition was off or if constantyl wired hot... if the motor cooled off.
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The fan switch has to be in the radiator, unless your running an electric water pump and a restrictor plate in place of a thermostat, and have the fans and pump wired together to turn on and off.. The engine heat soaks when you shut it off and the fans will continue to run forever if the fan switch Is on the engine side... Been here done this with dead battery's!!!
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I mean that certainly makes sense... but he didn't say with the ignition off... and the only time I think they would turn off if the off setting was at that low below the thermostat... idle or whatever, would be if the engine is off.
Did that read like I was thinking it in my head?😜
I mean with a 180 stat... and the off on the fan is 165... it should never turn off unless the ignition was off or if constantyl wired hot... if the motor cooled off.
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you read wright I was just expecting it to cycle but do to the off temp of 165 it isn't. I'm going to buy a new sensor that is off at 180 on at 195 that way it doesn't run all the time On a side note my 15 year old alternator isn't to happy with these fans 😂
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you read wright I was just expecting it to cycle but do to the off temp of 165 it isn't. I'm going to buy a new sensor that is off at 180 on at 195 that way it doesn't run all the time On a side note my 15 year old alternator isn't to happy with these fans 😂
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I recommend not doing that.
Relocate the sensor/switch.
Why run a 180° thermostat and keep the water at 195°?
Is this a small block?
Which water pump?
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I recommend not doing that.
Relocate the sensor/switch.
Why run a 180° thermostat and keep the water at 195°?
Is this a small block?
Which water pump?
stock sbc 305
Stock water pump
I'll try the switch at the pump
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stock sbc 305
Stock water pump
I'll try the switch at the pump
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It will work bitchen.
It's likely a "long" water pump. And should have a hole that will work. You want the fan to control the radiator temperature, not the engine. The radiator and the thermostat on the water side handles that.
GT
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I just stumbled across this in a box a variable speed controller would this be worth putting on
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I don't feel it's necessary.
I would rather see you use a hose adapter to put in line of the lower radiator hose and put the switch there. The aftermarket ones are cheap, but you could make a copper one with some parts from the hardware store. Even brass with a couple nipples and a tee.
GT
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I just stumbled across this in a box a variable speed controller would this be worth putting on
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By "in a box", do you mean you have one?
If the sensor is designed to be put under the hose at a fitting, I would do that.
Install it at the bottom hose of the radiator and set it for 165°F.
Done.
GT
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This one has a prob that goes in the radiator fins and yes I have it controls fan speed and temp adjustments
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This one has a prob that goes in the radiator fins and yes I have it controls fan speed and temp adjustments
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Use that, as low in the radiator as possible, dob of silicone on each side to hold it. Set it at 165°F and let her buck.
GT
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Use that, as low in the radiator as possible, dob of silicone on each side to hold it. Set it at 165°F and let her buck.
GT
relocated that the switch to the water pump and now it cycles on and off thanks for the info
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relocated that the switch to the water pump and now it cycles on and off thanks for the info
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Right on, any time.
GT
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Right on, any time.
GT
didnt bother wiring up the fan controller figured I'd wait until I put ac on the truck and a fresh motor but she works like a charm 👍🏻👍🏻
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didnt bother wiring up the fan controller figured I'd wait until I put ac on the truck and a fresh motor but she works like a charm 👍🏻👍🏻
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Well I told you it would.... LOL..
GT
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I had a thermo switch to turn on my fan in my El Camino. 327 motor. I used the type of switch that is supposed to be installed between the radiator fins. I cut off the probe and sanded it flat. I then JB welded the switch to the top tank. It worked great there. Fan would turn on and off when it was supposed to. I think it was on at 200 and off at 190. Its been a while. 180 tstat. Good luck