cooling fan coming on.

Hudstang · November 1st, 2009, 09:49 AM

At first I thought my battery was going bad ? I replace the neg. cable and cleaned everything up. Worked ok. I have notice after sitting all night that the cooling fan comes on for about 30 sec. This might be a drain on the battery at start up ? Read in the repair book that the fan is tied in with the engine coolant temp sensor a relay and then the cars pcm. Anyboby have a solution for this problem ?

97S281 · November 2nd, 2009, 06:47 PM

The fan running at the same time as the motor will not put any extra strain on your battery. If the motor is running then your alternator should be putting more than enough juice to your battery to compensate for the fan.

Check your battery level and put a multimeter on the battery before you start the car. It should be around 12v. It should go up to 13-14v when the car is running. If it is low before you start it up then goes to 13-14v then your battery is probably going bad. If it readss 12v then goes down slowly after you turn on the car then your alternator is not running properly.

CobraPhoenix · November 2nd, 2009, 06:53 PM

it comes on in the middle of the night? or am i missunderstanding

Big C · November 3rd, 2009, 12:14 PM

if its on other than when the car is running you have a problem.

97S281 · November 3rd, 2009, 06:16 PM

I think he means it comes on instantly when he starts the car after it has been sitting all night.

I'd be a little freaked out if he meant it comes on all during the night when the car is off.
I'd sure as hell be sellin' that. Haunted car=sucks.

November 1st, 2009, 09:49 AM	#1
Hudstang Regular Join Date: Apr 2007 Posts: 55 iTrader: 0 reviews	cooling fan coming on. At first I thought my battery was going bad ? I replace the neg. cable and cleaned everything up. Worked ok. I have notice after sitting all night that the cooling fan comes on for about 30 sec. This might be a drain on the battery at start up ? Read in the repair book that the fan is tied in with the engine coolant temp sensor a relay and then the cars pcm. Anyboby have a solution for this problem ?

November 2nd, 2009, 06:47 PM	#2
97S281 Rollin' 18/ pushin' 2 1997 Saleen S281 Join Date: Feb 2007 Location: Zebulon N.C. Posts: 6,251 iTrader: 13 reviews	The fan running at the same time as the motor will not put any extra strain on your battery. If the motor is running then your alternator should be putting more than enough juice to your battery to compensate for the fan. Check your battery level and put a multimeter on the battery before you start the car. It should be around 12v. It should go up to 13-14v when the car is running. If it is low before you start it up then goes to 13-14v then your battery is probably going bad. If it readss 12v then goes down slowly after you turn on the car then your alternator is not running properly. __________________ MODS IN GARAGE NCMM ORIGINAL BLOWN 96-98 CREW MEMBER # 1

November 3rd, 2009, 06:16 PM	#5
97S281 Rollin' 18/ pushin' 2 1997 Saleen S281 Join Date: Feb 2007 Location: Zebulon N.C. Posts: 6,251 iTrader: 13 reviews	I think he means it comes on instantly when he starts the car after it has been sitting all night. I'd be a little freaked out if he meant it comes on all during the night when the car is off. I'd sure as hell be sellin' that. Haunted car=sucks. __________________ MODS IN GARAGE NCMM ORIGINAL BLOWN 96-98 CREW MEMBER # 1

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Big C Enthusiast Join Date: Mar 2008 Posts: 526 iTrader: 0 reviews	if its on other than when the car is running you have a problem.

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