Cooling Fan Always On

six03e · 01-22-04, 04:12 AM

Hello. I am having a problem with my radiator cooling fan system. From the time i start up the car in the morning to the time i get home from work at night, the cooling fan is running. This happens regardless of whether or not i have the A/C on or regardless of the temperature of the cooling system. The temperature of the coolant (via the gauge in the dash) acts normal...starts at the bottom when cold and creeps to the middle and stays there.
I know that the fan is not hardwired to 12V because the problem jsut started a couple days ago, and I realize that this is not really an immediate problem, but it is annoying. I don't know if this has to do with the fan control unit or the sensor or what. ANy suggestions on what to try?

Johnny2 · 01-22-04, 04:58 AM

Do a search on cooling fan, a lot has been written on this & the search will give you lots of info plus save time.

six03e · 01-22-04, 05:01 AM

Quote:

Originally posted by Johnny2
Do a search on cooling fan, a lot has been written on this & the search will give you lots of info plus save time.

I did search already, all I found were cases where the cooling fan didnt' turn on and where both were turning on, neither of which is happenning.

KAHruzer · 01-22-04, 05:55 AM

Are you getting a Check Engine light? Codes on ECU or TCU?

six03e · 01-22-04, 06:02 AM

No, the check engine light isn't on. I haven't checked for ECU TCU codes, but i will post any if i see them.

KAHruzer · 01-22-04, 09:24 AM

I did look in my Service Manual.
In the diagnostic symptoms chart, a continuously running fan was not listed as a symptom.

BTW, is it both fans, or just one (which)?

There is a Fan Timer Control unit on the side of the ECU, and a Fan Control Unit at the top of your brake pedal. Then, there's at least one Fan Relay in the under hood fuse box.

If I were going for one stuck in the ON position, it'd be the brake pedal.

I bet, though, you're getting a TCU Code 12.

six03e · 01-22-04, 01:00 PM

What would a transmission control unit have to do with a cooling fan problem.

six03e · 01-22-04, 01:34 PM

Oh and by the way, th cooling fan comes on only when i have the key in number 2 position.

KAHruzer · 01-22-04, 02:31 PM

>>What would a transmission control unit have to do with a cooling fan problem.<<

Yeah, it doesn't make a lot of sense to me either, but see this:
http://www.legend-forum.com/vbulleti...threadid=42280

pecan2phat · 01-23-04, 06:25 AM

I have the same problem and it too only started recently. It is the condensor fan that is located to the left if facing the front of the car, correct?
I have replaced the Rad fan control unit with a new Oem unit last year, so I'm going to rule that out. I'm gonna try replacing the relay behind the windshield wiper reservoir and see if that does the trick.

six03e · 01-23-04, 06:27 AM

Quote:

Originally posted by pecan2phat
I have the same problem and it too only started recently. It is the condensor fan that is located to the left if facing the front of the car, correct?
I have replaced the Rad fan control unit with a new Oem unit last year, so I'm going to rule that out. I'm gonna try replacing the relay behind the windshield wiper reservoir and see if that does the trick.

Hey man, how much was the rad. fan control unit you replaced?

pacallen · 01-23-04, 06:42 AM

Quote:

Originally posted by six03e
Hey man, how much was the rad. fan control unit you replaced?

I got one for $2.50 at a junk yard a few months back. I pulled it myself...

pecan2phat · 01-27-04, 03:08 PM

Quote:

Originally posted by six03e
Hey man, how much was the rad. fan control unit you replaced?

$140 + shipping from ahmotor.com
My mechanic wanted $280 to replace the unit when I had him diagnose my non functioning fan problems.

six03e · 01-27-04, 03:47 PM

Quote:

Originally posted by pecan2phat
$140 + shipping from ahmotor.com
My mechanic wanted $280 to replace the unit when I had him diagnose my non functioning fan problems.

God damn, that's not even worth replacing

pacallen · 01-28-04, 01:49 AM

If you're talking about the little thing attached to the ECU (fan control unit), it is a $2.50 part if you go to a junkyard and find it. Heck, if you send me money for shipping I can send you one. However, there is a much more expensive part called the fan control relay which is hidden up underneath the dash which is a ***** to get to and is also a fairly expensive part to buy/labor to replace it. I had mine done at the Honda dealer and I got charged something like $200 or $250 for parts/labor.

01-22-04, 04:12 AM	#1 (permalink)
six03e Registered User Join Date: Jan 2004 Location: San Diego Posts: 40 Car 1: 1990 Gold Sedan iTrader: (0)	Cooling Fan Always On Hello. I am having a problem with my radiator cooling fan system. From the time i start up the car in the morning to the time i get home from work at night, the cooling fan is running. This happens regardless of whether or not i have the A/C on or regardless of the temperature of the cooling system. The temperature of the coolant (via the gauge in the dash) acts normal...starts at the bottom when cold and creeps to the middle and stays there. I know that the fan is not hardwired to 12V because the problem jsut started a couple days ago, and I realize that this is not really an immediate problem, but it is annoying. I don't know if this has to do with the fan control unit or the sensor or what. ANy suggestions on what to try?

01-22-04, 04:58 AM	#2 (permalink)
Johnny2 Registered User Join Date: Nov 2002 Location: Pryor, Ok. Posts: 123 Car 1: 89 White Coupe iTrader: (0)	Do a search on cooling fan, a lot has been written on this & the search will give you lots of info plus save time. __________________ 89 White Coupe, 95 White/Silver SE

01-22-04, 05:55 AM	#4 (permalink)
KAHruzer Moor Mo*h Join Date: Oct 2003 Location: Soonerville Posts: 1,604 Car 1: 1987 Legend LS Coupe iTrader: (0)	Are you getting a Check Engine light? Codes on ECU or TCU? __________________ Stock 1987 Legend LS Coupe 180k (11/07)

01-22-04, 09:24 AM	#6 (permalink)
KAHruzer Moor Mo*h Join Date: Oct 2003 Location: Soonerville Posts: 1,604 Car 1: 1987 Legend LS Coupe iTrader: (0)	I did look in my Service Manual. In the diagnostic symptoms chart, a continuously running fan was not listed as a symptom. BTW, is it both fans, or just one (which)? There is a Fan Timer Control unit on the side of the ECU, and a Fan Control Unit at the top of your brake pedal. Then, there's at least one Fan Relay in the under hood fuse box. If I were going for one stuck in the ON position, it'd be the brake pedal. I bet, though, you're getting a TCU Code 12. __________________ Stock 1987 Legend LS Coupe 180k (11/07)

01-22-04, 02:31 PM	#9 (permalink)
KAHruzer Moor Mo*h Join Date: Oct 2003 Location: Soonerville Posts: 1,604 Car 1: 1987 Legend LS Coupe iTrader: (0)	>>What would a transmission control unit have to do with a cooling fan problem.<< Yeah, it doesn't make a lot of sense to me either, but see this: http://www.legend-forum.com/vbulleti...threadid=42280 __________________ Stock 1987 Legend LS Coupe 180k (11/07)

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01-22-04, 06:02 AM	#5 (permalink)
six03e Registered User Join Date: Jan 2004 Location: San Diego Posts: 40 Car 1: 1990 Gold Sedan iTrader: (0)	No, the check engine light isn't on. I haven't checked for ECU TCU codes, but i will post any if i see them.

01-22-04, 01:00 PM	#7 (permalink)
six03e Registered User Join Date: Jan 2004 Location: San Diego Posts: 40 Car 1: 1990 Gold Sedan iTrader: (0)	What would a transmission control unit have to do with a cooling fan problem.

01-22-04, 01:34 PM	#8 (permalink)
six03e Registered User Join Date: Jan 2004 Location: San Diego Posts: 40 Car 1: 1990 Gold Sedan iTrader: (0)	Oh and by the way, th cooling fan comes on only when i have the key in number 2 position.

01-23-04, 06:25 AM	#10 (permalink)
pecan2phat 6-Speed Member Join Date: Feb 2002 Location: Long Island, NY Posts: 893 Car 1: 90 & 94 LS Coupes iTrader: (0)	I have the same problem and it too only started recently. It is the condensor fan that is located to the left if facing the front of the car, correct? I have replaced the Rad fan control unit with a new Oem unit last year, so I'm going to rule that out. I'm gonna try replacing the relay behind the windshield wiper reservoir and see if that does the trick.

01-28-04, 01:49 AM	#15 (permalink)
pacallen ------------------------- Join Date: Oct 2003 Location: Chicago Posts: 1,742 Car 1: '89 LS Coupe (5 speed) iTrader: (1)	If you're talking about the little thing attached to the ECU (fan control unit), it is a $2.50 part if you go to a junkyard and find it. Heck, if you send me money for shipping I can send you one. However, there is a much more expensive part called the fan control relay which is hidden up underneath the dash which is a ***** to get to and is also a fairly expensive part to buy/labor to replace it. I had mine done at the Honda dealer and I got charged something like $200 or $250 for parts/labor. __________________ SOLD: '87 Auto Sedan (12/31/2003)

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