Automotive Forums .com - the leading automotive community online! Automotive Forums .com - the leading automotive community online!
Automotive Forums .com - the leading automotive community online! 
-
Latest | 0 Rplys
Go Back   Automotive Forums .com Car Chat > Engineering/Technical
Engineering/Technical Ask technical questions about cars. Do you know how a car engine works?
Reply Show Printable Version Show Printable Version | Email this Page Email this Page | Subscription Subscribe to this Thread
 
Thread Tools Search this Thread
Old 02-27-2004, 11:20 PM   #1
jeffseby
AF Enthusiast
 
jeffseby's Avatar
 
Join Date: Oct 2002
Location: Temple, Texas
Posts: 549
Thanks: 0
Thanked 0 Times in 0 Posts
Send a message via AIM to jeffseby
Question Easy Question about cooling fan? How does the Radiator Cooling fan know when to Come

How does the Radiator Cooling fan know when to Come On? It may be from the Coolant Temp Sensor, but I thought that wire only goes to the Gauge....?
__________________



Ya, It's Turboed.
jeffseby is offline   Reply With Quote
Old 02-29-2004, 01:25 AM   #2
rubix777
AF Enthusiast
 
rubix777's Avatar
 
Join Date: Aug 2003
Location: Santa Ana, California
Posts: 668
Thanks: 0
Thanked 0 Times in 0 Posts
Send a message via AIM to rubix777
doesn't the thermostat trigger the fan?
rubix777 is offline   Reply With Quote
Old 02-29-2004, 10:15 AM   #3
crxlvr
Slowest Automatic Civic
 
crxlvr's Avatar
 
Join Date: Dec 2001
Location: New York, New York
Posts: 11,460
Thanks: 1
Thanked 1 Time in 1 Post
Send a message via AIM to crxlvr
its the thermostat activates it.
__________________
Name: Scott

Stable Of Cars I have Owned:
1991 Honda CRX
1990 Oldsmobile Cutlass Supreme
2003 Honda Accord
1998 Chrysler Concorde
2007 Honda Civic
1997 Toyota Camry
1995 Saturn SC2
1996 Ford Taurus
1991 GMC Sierra
2002 Daewoo Leganza
1999 Dodge Ram
2007 Honda CR-V
2003 BMW 325i
crxlvr is offline   Reply With Quote
Old 02-29-2004, 10:15 AM   #4
jcrx
AF Enthusiast
 
Join Date: Jun 2002
Posts: 2,040
Thanks: 0
Thanked 0 Times in 0 Posts
Send a message via AIM to jcrx
Re: Easy Question about cooling fan? How does the Radiator Cooling fan know when to Come

Fanswitch.
__________________
jcrx is offline   Reply With Quote
Old 02-29-2004, 07:14 PM   #5
jeffseby
AF Enthusiast
Thread starter
 
jeffseby's Avatar
 
Join Date: Oct 2002
Location: Temple, Texas
Posts: 549
Thanks: 0
Thanked 0 Times in 0 Posts
Send a message via AIM to jeffseby
Re: Easy Question about cooling fan? How does the Radiator Cooling fan know when to Come

I concure, the thermostat is a just little spring thing that opens at 180 Degrees, it just lets the coolant flow, it has no electrical connections at all.
Maybe the ECU just activates it every five minutes or so??? but I don't know.
__________________



Ya, It's Turboed.
jeffseby is offline   Reply With Quote
Old 03-01-2004, 01:46 AM   #6
rubix777
AF Enthusiast
 
rubix777's Avatar
 
Join Date: Aug 2003
Location: Santa Ana, California
Posts: 668
Thanks: 0
Thanked 0 Times in 0 Posts
Send a message via AIM to rubix777
then why is the thermostat the first thing someone changes, when their fans do not automatically turn on?
rubix777 is offline   Reply With Quote
Old 03-01-2004, 11:08 AM   #7
jcrx
AF Enthusiast
 
Join Date: Jun 2002
Posts: 2,040
Thanks: 0
Thanked 0 Times in 0 Posts
Send a message via AIM to jcrx
Re: Easy Question about cooling fan? How does the Radiator Cooling fan know when to Come

I don't know who that someone is, but if my fan doesn't come on, I change the fanswitch.
__________________
jcrx is offline   Reply With Quote
Old 03-04-2004, 08:10 PM   #8
Tofuboy
AF Regular
 
Tofuboy's Avatar
 
Join Date: Dec 2001
Location: Issaquah, Washington
Posts: 400
Thanks: 0
Thanked 0 Times in 0 Posts
There are two sensors/resistors for the ECT. One I think runs on 12V which goes to the gauge on your cluster, the other runs on a 5V reference voltage for the ECU.

The ECU sends a 5V out to the sensor/resistor and reads the voltage after it goes through the sensor to determine the temperture, if necessary, the ECU will send a signal to the fan relay/switch to active the fan.

It's not necessary the fan relay or switch that cause the fan not working, you will have to run a test to check what componet is the cause.

Now for those who read this post and gain some knowledge please send a "civic build up fund" to my paypal account (bunta_fujiwara@hotmail.com) if you can.

Thank you.
__________________
Power is nothing without control

The fastest driver is the one with skills

95 Civic EX
83 Toyota Starlet
07 Ducati Monster S4RS
Tofuboy is offline   Reply With Quote
Old 08-07-2004, 03:05 PM   #9
bryan.az
AF Newbie
 
Join Date: Aug 2004
Location: phoenix, Arizona
Posts: 1
Thanks: 0
Thanked 0 Times in 0 Posts
Re: Easy Question about cooling fan? How does the Radiator Cooling fan know when to Come

i got a 96 integra that the fans dont switch on at all does anytone got any clues, the relays and fuses are fine but still no power to either fan???
bryan.az is offline   Reply With Quote
Old 08-07-2004, 04:35 PM   #10
civickiller
AF Fanatic
 
Join Date: Apr 2002
Posts: 4,356
Thanks: 0
Thanked 0 Times in 0 Posts
Send a message via AIM to civickiller
how do you know hte relay is fine ?
__________________
Team Lonely Drivers
civickiller is offline   Reply With Quote
Old 08-08-2004, 01:57 AM   #11
GWInquisitor14
AF Enthusiast
 
GWInquisitor14's Avatar
 
Join Date: Nov 2003
Location: Pewaukee, Wisconsin
Posts: 185
Thanks: 0
Thanked 0 Times in 0 Posts
Send a message via AIM to GWInquisitor14
Re: Easy Question about cooling fan? How does the Radiator Cooling fan know when to Come

Tofuboy hit the nail right on the head. When the CTS sends back a certain voltage, it changes that into a temperature and when it gets so hot, it turns the fan on. All the thermostat does is open up to let coolant into the engine. If it didn't, the fan wouldnt turn on because the air rushing past the radiator would always be cooling the coolant and there would be no hot energy from the engine to transfer into it thus no need to turn on the fan.
__________________
If the car really knew about all this trickery, hed be pretty mad.

FOR SALE
2 10" Alpine 1041 Type R
JBL BP 1200.1 1200 watt RMS amp

Message me if you are interested, make me an offer
GWInquisitor14 is offline   Reply With Quote
Old 08-11-2004, 12:19 PM   #12
almxdupintegra
AF Enthusiast
 
Join Date: Feb 2004
Location: Hagatna
Posts: 178
Thanks: 0
Thanked 0 Times in 0 Posts
Re: Easy Question about cooling fan? How does the Radiator Cooling fan know when to Come

It should turn on as soon as you turn on the AC, at least in my car thats how it goes on
__________________
FRIENDS DON'T LET FRIENDS DRIVE STOCK
almxdupintegra is offline   Reply With Quote
Old 08-12-2004, 07:08 PM   #13
gunnmen01
AF Fanatic
 
gunnmen01's Avatar
 
Join Date: Apr 2002
Posts: 2,151
Thanks: 0
Thanked 0 Times in 0 Posts
Send a message via AIM to gunnmen01 Send a message via Yahoo to gunnmen01
theres a 2 pin connecter on the thermostat housing, thats the sensor that turns on the cooling fan... if you want to test that sensor cuz your fans dont run, try using a jumper wire between those 2 wires on the connecter, that should make them run... if the fan works the sensor is bad


gunnmen01
__________________
My other ride..... is YOUR MOM !!!!!!
gunnmen01 is offline   Reply With Quote
 
Similar Threads
Thread Thread Starter Forum Replies Last Post
what side does the larger cooling fan mount on a 1997 dodge neon? thecrow1986 Neon | Plymouth Neon 1 07-05-2007 06:53 PM
How to Replace Radiator Cooling Fan tabbie07 Cavalier Problem Diagnosis 10 08-14-2006 08:34 PM
How does the horm ring come off? murocflyer Charger R/T | Charger SRT8 1 01-04-2004 06:18 PM

Reply

POST REPLY TO THIS THREAD


Bookmarks
Go Back   Automotive Forums .com Car Chat > Engineering/Technical

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 09:33 AM.

Community Participation Guidelines | How to use your User Control Panel

Powered by: vBulletin | Copyright Jelsoft Enterprises Ltd.
 
 
no new posts