Cooling Fan wont turn on!

oasr87 · July 21st, 2007, 07:25 PM

I just finished dropping my rebuilt motor and started it with no problem. I saw that the temp kept going up and i know the thermostat works because i checked it in boiling water.

I did notice that the cooling fan wont turn on. Any help, how can i diagnose it??? thanx

Cricket · July 21st, 2007, 07:30 PM

Is everything connected? Seriously go out and check.

El_Cangri · July 21st, 2007, 09:24 PM

check all r connections or it could be the motor died...

i change the filter on my mirage and coincedaly the motor of my fan died the same day....

strange coincedance can happen

oasr87 · July 21st, 2007, 10:10 PM

Ok i connected the motor directly to the battery and it turned on no problem. so then i connected everything back and started up the engine and the fan would not turn on, so this time i disconnected the engine coolant temp sensor and outomatically the fan turned on at high speed. I dont know what could be wrong

i just left the coolant temp sensor off so the fan could always be working and my engine wont heat up.

Any ideas???

thisisme · July 21st, 2007, 10:19 PM

Originally Posted by oasr87

Ok i connected the motor directly to the battery and it turned on no problem. so then i connected everything back and started up the engine and the fan would not turn on, so this time i disconnected the engine coolant temp sensor and outomatically the fan turned on at high speed. I dont know what could be wrong

i just left the coolant temp sensor off so the fan could always be working and my engine wont heat up.

Any ideas???

Just put an electric water pump on there and youll be alright

El_Cangri · July 21st, 2007, 10:43 PM

so... something is busted... when u disconnect the coolant temp sensor the fan will turn on so that way u dont heat up... u have a tuner? or have u mess up with the fan temp activation or w.e....

why would the problem would be corrected by a electric water pump if that not even the prob... its the fan not the pump...

Onemanzu · July 22nd, 2007, 12:04 AM

check the fuse and check for shorts.. mine shorted on me so that is a possibility

thisisme · July 22nd, 2007, 12:32 AM

Originally Posted by El_Cangri

so... something is busted... when u disconnect the coolant temp sensor the fan will turn on so that way u dont heat up... u have a tuner? or have u mess up with the fan temp activation or w.e....

why would the problem would be corrected by a electric water pump if that not even the prob... its the fan not the pump...

im glad you caught that. I meant to say get a thermal kit. the thermal kit consists of an electric coolant pump, electric fan, electronic thermostat, optimized radiator and heat exchangers, along with a feedback control system. Though, if he's not going to be modding his car too much, he may not want to get one...

oasr87 · July 22nd, 2007, 02:58 AM

I checked the Haynes book for wiring diagrams but there isn't one for the 3.8L, so i dont know what fuse or breaker goes to the fan.

WoA i never knew an electronic thermostat existed. All that sounds real neat but you are right I wont mod my car I just want to get that fixed.

oasr87 · July 22nd, 2007, 03:32 AM

nope i dont have a tuner and have not messed with the computer.

wut do you think it is

C MY 4D · July 22nd, 2007, 03:38 AM

check your relays on the drivers fenderwell.

El_Cangri · July 22nd, 2007, 05:07 PM

fuse relay w.e check all the fuse like C MY 4D wrote...

oasr87 · July 22nd, 2007, 07:58 PM

the fuses are good, how do u check relays? thanx for the help

El_Cangri · July 22nd, 2007, 09:41 PM

i just change em.. for example u got the fan relay and a blinker fluid relay

.. put the blinker fluid relay in the fan relay spot.. if its good well it will turn on meaning ur fan relay was bad...

oasr87 · July 22nd, 2007, 10:04 PM

orale thanx I'm going to try it as soon as I get out of work.

oasr87 · July 24th, 2007, 03:14 PM

ok i switched the relays and it didnt work

El_Cangri · July 24th, 2007, 08:58 PM

ok... so the fan just hates u

well men idk it could be some kind of short..... some mechanichs can check the volstages and things (at leas mine can) check for short then..

Juggalo_X · July 25th, 2007, 10:45 AM

the fan motor could be fucked its that simple. easiest way to check is to remove the fan and jump it to the battery if it spins you have a wiring issue.

CyberPrey · July 25th, 2007, 11:37 AM

Change the coolant temp sensor?

Juggalo_X · July 25th, 2007, 11:41 AM

Originally Posted by CyberPrey

Change the coolant temp sensor?

if it was just the sensor then he wouldnt have been through 2 head gaskets. i have a feeling its a coolant blockage in the block or rad and or a tranny issue.

July 21st, 2007, 07:25 PM	#1
oasr87 Regular Join Date: Feb 2007 Posts: 127 iTrader: 0 reviews	Cooling Fan wont turn on! I just finished dropping my rebuilt motor and started it with no problem. I saw that the temp kept going up and i know the thermostat works because i checked it in boiling water. I did notice that the cooling fan wont turn on. Any help, how can i diagnose it??? thanx

July 22nd, 2007, 12:04 AM	#7
Onemanzu ¡ʇsnq ɹo uʍop ǝpısdn Join Date: Oct 2006 Location: Looking for free hand jobs in poland springs nebraska... silly gooses Posts: 12,551 Blog Entries: 1 iTrader: 0 reviews	check the fuse and check for shorts.. mine shorted on me so that is a possibility __________________ My Foz

July 22nd, 2007, 03:38 AM	#11
C MY 4D Billy Weston 2003 Cobra 11.14@124.36 Join Date: Aug 2006 Location: Hampton, VA Posts: 4,806 iTrader: 8 reviews	check your relays on the drivers fenderwell. __________________ TT Build in progress....... Need work done to your car for a great price in Hampton Roads? Shoot me a PM.

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July 21st, 2007, 10:10 PM	#4
oasr87 Regular Join Date: Feb 2007 Posts: 127 iTrader: 0 reviews	Ok i connected the motor directly to the battery and it turned on no problem. so then i connected everything back and started up the engine and the fan would not turn on, so this time i disconnected the engine coolant temp sensor and outomatically the fan turned on at high speed. I dont know what could be wrong i just left the coolant temp sensor off so the fan could always be working and my engine wont heat up. Any ideas???

July 22nd, 2007, 02:58 AM	#9
oasr87 Regular Join Date: Feb 2007 Posts: 127 iTrader: 0 reviews	I checked the Haynes book for wiring diagrams but there isn't one for the 3.8L, so i dont know what fuse or breaker goes to the fan. WoA i never knew an electronic thermostat existed. All that sounds real neat but you are right I wont mod my car I just want to get that fixed.

July 22nd, 2007, 03:32 AM	#10
oasr87 Regular Join Date: Feb 2007 Posts: 127 iTrader: 0 reviews	nope i dont have a tuner and have not messed with the computer. wut do you think it is

July 22nd, 2007, 07:58 PM	#13
oasr87 Regular Join Date: Feb 2007 Posts: 127 iTrader: 0 reviews	the fuses are good, how do u check relays? thanx for the help

July 22nd, 2007, 10:04 PM	#15
oasr87 Regular Join Date: Feb 2007 Posts: 127 iTrader: 0 reviews	orale thanx I'm going to try it as soon as I get out of work.

July 24th, 2007, 03:14 PM	#16
oasr87 Regular Join Date: Feb 2007 Posts: 127 iTrader: 0 reviews	ok i switched the relays and it didnt work

July 25th, 2007, 10:45 AM	#18
Juggalo_X I Post Entirely Way Too Much 2001 Mustang 232/CBR600 14+@Slow Join Date: Jan 2007 Location: South Western Ontario Posts: 6,688 iTrader: 0 reviews	the fan motor could be fucked its that simple. easiest way to check is to remove the fan and jump it to the battery if it spins you have a wiring issue.

July 25th, 2007, 11:37 AM	#19
CyberPrey Regular Join Date: Oct 2006 Posts: 328 iTrader: 0 reviews	Change the coolant temp sensor?

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