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alex
Dodge Dakota
JOIN HERE
1/29/2002
15:27:10
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 Subject: Hey CW!! Fan Tricks!
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Message:
I saw how you wired up a thermostat to control the electric fan now that you're not running the clutch fan anymore. How did you wire up that switch? I thought the PCM controlled the on/off for that fan. I haven't looked at the wiring, but how did you wire it?
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CW
GenIII
1/29/2002
20:03:48
|  RE: Hey CW!! Fan Tricks!
IP: Logged
Message:
I just got a adjustable thermostatic switch that was made to handle the load of a single electric fan. Under the fan shroud there are 2 wires running to the fan one green one black. I spliced in the switch to the green one (power)and took power to supply this right out of the Power distribution center (PDC) battery positive terminal. I used a 30 amp fuse and placed it just outside of the PDC ran it to the thermostatic switch and from there down to the green wire on the fan.
Unfortunately I can't remember the brand of the switch. I will look around to see if I can find out what it is or a suitable replacment.
Note some thermostatic switches are not designed to with stand the load of a electric fan and will need to be wired in on the relay side of the circut.
2001 RC 4.7 5sp 9.25" 3.92 LSD
Ported 68mm throttle body, IAT adjuster, 3" flowmaster cat back, TPS @ .76V, 4" cold air, Roadmaster active suspention, Removed Third cat. Electric fan Convertion, Awaiting HO cams.
Working on adjustable fuel pressure with return.
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alex
Dodge Dakota
JOIN HERE
1/30/2002
09:17:11
| RE: Hey CW!! Fan Tricks!
IP: Logged
Message:
So, I've used the type of fan with an actual thermostatic pick-up that presses against the radiator hose (Perma-Cool I think). There's not one of those,Huh?
It's just the adjustable switch and an inline fuse run from the battery to the power side of the fan wiring?
I'm kind of an electrical dummy, if you can't tell.
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CW
GenIII
1/30/2002
14:18:03
| RE: Hey CW!! Fan Tricks!
IP: Logged
Message:
Yep. I will look tonight for the switch brand. When I wired to the green wire I just spliced into it.
2001 RC 4.7 5sp 9.25" 3.92 LSD
Ported 68mm throttle body, IAT adjuster, 3" flowmaster cat back, TPS @ .76V, 4" cold air, Roadmaster active suspention, Removed Third cat. Electric fan Convertion, Awaiting HO cams.
Working on adjustable fuel pressure with return.
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ALEX
Dodge Dakota
JOIN HERE
1/30/2002
14:33:19
| RE: Hey CW!! Fan Tricks!
IP: Logged
Message:
Thanks for your help, Boss.
I'm trying to get the fan to kick in around 195 or maaaaybe 200, but not all the way up to 210. My old Perma-Cool had that coolant temp sensor that was set to kick in at 170, but if it wasn't absolutely smashed up against the radiator hose, the fan wouldn't cut on til like 210 or 220, and then it had big trouble keeping up.
That was sitting in stop & go traffic (like the staging lanes, etc.) Guess I'll be able to adjust the on/off point way down low in the staging lanes to help cool things quicker.
Keep me posted on that switch....
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CW
GenIII
1/30/2002
20:32:41
| RE: Hey CW!! Fan Tricks!
IP: Logged
Message:
I didn't find what I used but I did find something similar. fan switch
2001 RC 4.7 5sp 9.25" 3.92 LSD
Ported 68mm throttle body, IAT adjuster, 3" flowmaster cat back, TPS @ .76V, 4" cold air, Roadmaster active suspention, Removed Third cat. Electric fan Convertion, Awaiting HO cams.
Working on adjustable fuel pressure with return.
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alex
Dodge Dakota
JOIN HERE
1/31/2002
07:57:47
| RE: Hey CW!! Fan Tricks!
IP: Logged
Message:
Thanks for your help, I'll call Jeg's & figure it out. DO those things come with pretty good wiring diagrams?
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CW
GenIII
1/31/2002
09:05:28
| RE: Hey CW!! Fan Tricks!
IP: Logged
Message:
I should have a pretty good wiring diagram.
2001 RC 4.7 5sp 9.25" 3.92 LSD
Ported 68mm throttle body, IAT adjuster, 3" flowmaster cat back, TPS @ .76V, 4" cold air, Roadmaster active suspention, Removed Third cat. Electric fan Convertion, Awaiting HO cams.
Working on adjustable fuel pressure with return.
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ALEX
Dodge Dakota
JOIN HERE
2/01/2002
08:49:23
| RE: Hey CW!! Fan Tricks!
IP: Logged
Message:
One more question for the big dummy (that's me).
When you say you've spliced into the power wire, are you hard wiring it to the battery, or does the PCM still have control over the fan. I'm just confused.
Will the thermostatic switch over-ride the PCM (which makes the fan come on at 210), or does the PCM have control over that fan at all??
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CW
GenIII
2/01/2002
08:58:36
| RE: Hey CW!! Fan Tricks!
IP: Logged
Message:
The thermostatic switch operates separately of the PCM. The PCM never knows it is there. The theremostatic switch is what turns the fan on and off directly. The PCM still has control of the fan as well. It runs with the PCM and with the thermostatic switch.
2001 RC 4.7 5sp 9.25" 3.92 LSD
Ported 68mm throttle body, IAT adjuster, 3" flowmaster cat back, TPS @ .76V, 4" cold air, Roadmaster active suspention, Removed Third cat. Electric fan Convertion, Awaiting HO cams.
Working on adjustable fuel pressure with return.
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alex
Dodge Dakota
JOIN HERE
2/01/2002
09:17:44
| RE: Hey CW!! Fan Tricks!
IP: Logged
Message:
Cool. Thanks for your help. I finally pulled the clutch fan off yesterday, so Saturday is 180 T-stat day, and prolly thermostat switch day (while I'm down there).
I'll let you know how it goes.
a
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Daddy-D
*GenIII*
2/02/2002
01:00:56
| RE: Hey CW!! Fan Tricks!
IP: Logged
Message:
I just remembered something - SAABs used
an inline thermoswitch in the rad hose; I'll
check diameter next time I'm under the hood.
'98 DakSport C/C 3.9 2WD A/T
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