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Thread: Fans run all the time..

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Posts: 1-10 of 24
2013-05-05 15:12:25
#1
Fans run all the time..
I was wondering if there is a reason my radiator fans turn on when I start my car? I am using the USDM coolant sensors. :/
2013-05-05 15:21:33
#2
What kind of ecu are you running?
2013-05-05 15:24:20
#3
De ECU for now.
2013-05-05 15:29:26
#4
Hmmm. Thats interesting. I have seen this issue with chipped ecu's when either the chips were bad / place in backwards. Is the coolant temp sensor new? Have another de ecu to slap in to rule out the ecu?
2013-05-05 15:36:15
#5
No this is the only ECU I have around. Everything was fine before the swap. The fans would kick on when they needed to.

No the sensors aren't new.
2013-05-05 15:43:40
#6
I'll try and think of any possibilities of reversed wires that could cause this. In the meantime, I would try another coolant temp sensor, even if its an AutoZone special.
2013-05-05 15:58:49
#7
So I take it it's not the healthiest to just let the fans run all the time then. :/
2013-05-05 16:04:26
#8
Nope. I have seen them go bad which makes the ecu read high temps which in turn keeps the fans running. Luckily, I have had the auto zone / advance auto parts sensors work fine for me and usually run 15 to 18$. Give it a shot!
2013-05-05 16:06:57
#9
Right ill give it a try later on today. Ill probably get a more accurate timing mark with out the blow air. The VE makes it so much easier to get to!
2013-05-05 16:09:39
#10
Originally Posted by circa.13
So I take it it's not the healthiest to just let the fans run all the time then. :/


Its not BAD. But it is a problem. Is this a new swap? Sounds just like the problem I had with my sway. I found two connectors that were not plugged in. Mine is a p11, so I dont know if your engine bay harness is the same setup. You can find the pinout here, How to correctly use a 94-97 B14 ECU in a 99 P11. Check you the continuity between the ecu and the sensor wire, I believe it is green w/yellow stripe. If there is no continuity, then you have a harness plug undone. If you do have continuity, try a new sensor. If neither work. Make sure you pull the codes off the ecu and compare them to the OBD I, or OBD II charts.
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