 Electrical question, Running Radiator fans |
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| ventedrib |
 May 15 2013, 11:52 AM
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#1
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Member  Group: Members Posts: 104 Joined: 10-August 08 From: Monroe La. Member No.: 9,406 Region Association: South East States  |
I have a subie powered 73, I have been running the dual radiator fans directly off the battery. The fans are renagade hybreds fans they have there own relays and turn on and off with a thermostat in the radiator. This works good but I don't like that the fans run for 4 or 5 minutes after I turn the car off. I no longer have headlight motors but wire to the motors is still there, I dont have a fresh air fan any longer but wiring is still there. I took the large red wire at the fuse panel head light motor and moved it to the switched fresh air fan / wideshield wiper terminal and wired the fans on to the large red wire were the headlight motors used to be. Fans came on and were swithed, turn the key off fans went off. Went for a drive came back fans not running, cked and had no voltage, pulled fuse panel and found that the relay, I guess for the wipers had pretty much melted. Swaped one of the outher relays and had volts again. Is there a way to bypass that relay since the fans have there own or put a relay at the fuse box to handle the draw of the fans, or just keep it like I had it.
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| okieflyr |
May 15 2013, 01:22 PM
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#2
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9fauxteen Group: Members Posts: 816 Joined: 9-January 05 From: Phila PA Member No.: 3,426 Region Association: North East States |
With a quick read of your post, your probably overloading that circuit with the fan amperage. Putting a heavier relay may continue that trend and the next bad wire when it catches fire. Putting a switched relay on your original power feed from the battery power.
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| 904svo |
May 15 2013, 01:51 PM
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#3
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904SVO Group: Members Posts: 1,118 Joined: 17-November 05 From: Woodstock,Georgia Member No.: 5,146 |
Who's ECU are you using? Most of them have a build in fan control circuit control
using the engine temperature sensor to turn the fans off and on. Thats what I did with my conversion. |
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| Cap'n Krusty |
May 15 2013, 04:06 PM
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#4
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Cap'n Krusty Group: Members Posts: 10,794 Joined: 24-June 04 From: Santa Maria, CA Member No.: 2,246 Region Association: Central California |
The fans run after shut down for a reason. You might not like it, but they bring the coolant temps down to safe levels after the water pump stops pumping the coolant around. Audis and some other cars incorporate an afterrun coolant pump in addition to the fans.
The Cap'n |
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| Drums66 |
 May 15 2013, 04:46 PM
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#5
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914 Rudiments Group: Members Posts: 5,321 Joined: 15-January 03 From: Coronado,Cali Member No.: 151 Region Association: Southwest Region |
QUOTE(904svo @ May 15 2013, 12:51 PM)  Who's ECU are you using? Most of them have a build in fan control circuit control using the engine temperature sensor to turn the fans off and on. Thats what I did with my conversion. |
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| ThePaintedMan |
May 15 2013, 04:53 PM
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#6
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Advanced Member Group: Members Posts: 3,886 Joined: 6-September 11 From: St. Petersburg, FL Member No.: 13,527 Region Association: South East States 
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QUOTE(Cap'n Krusty @ May 15 2013, 06:06 PM) The fans run after shut down for a reason. You might not like it, but they bring the coolant temps down to safe levels after the water pump stops pumping the coolant around. Audis and some other cars incorporate an afterrun coolant pump in addition to the fans. The Cap'n That's the only time that idea ever made any sense to me. Why cool the coolant down after the car has stopped running if it's not circulating? |
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| monkeyboy |
May 15 2013, 11:05 PM
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#7
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Senior Member Group: Members Posts: 808 Joined: 8-June 08 From: Los Angeles, Ca Member No.: 9,147 Region Association: None |
It's a closed system. It can still flash boil in the heads causing pressure to go up in the entire system.
Cooling the radiator helps bring the average temp down, and it will circulate very slowly on it's own. Convection cooling I think it's called. |
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