temperature sensor at the bottom of radiator? - Toyota Nation Forum : Toyota Car and Truck Forums


» Auto Insurance
» Featured Product
Advertisement
Wheel & Tire Center

Go Back   Toyota Nation Forum : Toyota Car and Truck Forums > Toyota Passenger and Sports Car Forums > Corolla and Matrix Forum > Archived Corolla threads

Archived Corolla threads Older Archived Corolla threads

ToyotaNation.com is the premier Toyota Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools Display Modes
Old 12-27-2006, 08:26 PM   #1 (permalink)
New TN User
 
Join Date: Oct 2006
Location: New York
Posts: 11
Thanks: 0
Thanked 0 Times in 0 Posts
iTrader Score: 0 reviews
View xzhuang's Photo Gallery
USA temperature sensor at the bottom of radiator?

I was checking my Corolla (92 DX, 4AFE) and saw there is
another sensor-like stuff at the bottom of the radiator
on the passenger side.
Assume the temperature sensor to the ECU is located
near thermostat housing, just can't think of what this
is for..






xzhuang is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 12-27-2006, 10:07 PM   #2 (permalink)
TN Post Wh*re
 
Join Date: Jun 2006
Location: PNW
Posts: 6,403
Thanks: 0
Thanked 13 Times in 12 Posts
Supreme Member
iTrader Score: 0 reviews
View toyomoho's Photo Gallery
If an electric radiator fan, most likely it is the temp control switch.
toyomoho is offline   Reply With Quote
Old 12-27-2006, 10:39 PM   #3 (permalink)
All-Trac Guru
 
ghost_ryder35's Avatar
 
Join Date: Oct 2006
Location: Wisconsin
Posts: 682
Thanks: 1
Thanked 0 Times in 0 Posts
iTrader Score: 0 reviews
View ghost_ryder35's Photo Gallery
Quote:
Originally Posted by toyomoho
If an electric radiator fan, most likely it is the temp control switch.
__________________
89 Corolla All-Trac Sedan White 188,xxx (Sold)
89 Corolla All-Trac Wagon Blue 172,xxx (Current)
ghost_ryder35 is offline   Reply With Quote
Old 12-27-2006, 10:46 PM   #4 (permalink)
New TN User
 
Join Date: Oct 2006
Location: New York
Posts: 11
Thanks: 0
Thanked 0 Times in 0 Posts
iTrader Score: 0 reviews
View xzhuang's Photo Gallery
Not likely, the following two figures show 5 sensor-like stuffs around
the thermostat area. The fan switch is actually behind the red handle,
i.e. the white plug. Unplugging it will keep the fan running.
The other four plugs are start inject time switch, temp sensor to ECU,
temp sending unit to the gauge and BVSV.
I really have no idea why another sensor is needed on the radiator
( to double check the temperature?)
This is not documented anywhere from either Haynes or Chilton and
not seeing anyone mentioned it on this forum.












xzhuang is offline   Reply With Quote
Old 12-27-2006, 10:50 PM   #5 (permalink)
All-Trac Guru
 
ghost_ryder35's Avatar
 
Join Date: Oct 2006
Location: Wisconsin
Posts: 682
Thanks: 1
Thanked 0 Times in 0 Posts
iTrader Score: 0 reviews
View ghost_ryder35's Photo Gallery
it is the radiator fan switch, it detects the tempetture of the fluid passing through the radiator, then determines if the fan needs to be turned on or not, so yes, VERY LIKELY
__________________
89 Corolla All-Trac Sedan White 188,xxx (Sold)
89 Corolla All-Trac Wagon Blue 172,xxx (Current)
ghost_ryder35 is offline   Reply With Quote
Old 12-27-2006, 10:59 PM   #6 (permalink)
New TN User
 
Join Date: Oct 2006
Location: New York
Posts: 11
Thanks: 0
Thanked 0 Times in 0 Posts
iTrader Score: 0 reviews
View xzhuang's Photo Gallery
I haven't tried to unplug it, but I did try to unplug the one on the
thermostat (behind red handle). It controls the fan. Also this is
confirmed from multiple sources that the fan switch is on the thermostat
and it should only contain one wire!

But the one at the bottom of the radiator has two wires, so it is more
likely a sensor just like the other sensor on the last figure above.

Anyhow, it seems one of the components is duplicated, could someone
explain this?

A figure of the fan switch is here:

http://shop.toyotapartstore.com/bran...an_switch&my=1


Last edited by xzhuang; 12-27-2006 at 11:02 PM.
xzhuang is offline   Reply With Quote
Old 12-27-2006, 11:08 PM   #7 (permalink)
All-Trac Guru
 
ghost_ryder35's Avatar
 
Join Date: Oct 2006
Location: Wisconsin
Posts: 682
Thanks: 1
Thanked 0 Times in 0 Posts
iTrader Score: 0 reviews
View ghost_ryder35's Photo Gallery
toyota has set up the cooling system in a fail safe way, if any sensor does not send a signal then the radiator fan automatically turns on to prevent worse case senario of overheating, this is why unplugging a switch will "control" the fan.
__________________
89 Corolla All-Trac Sedan White 188,xxx (Sold)
89 Corolla All-Trac Wagon Blue 172,xxx (Current)
ghost_ryder35 is offline   Reply With Quote
Old 12-27-2006, 11:11 PM   #8 (permalink)
New TN User
 
Join Date: Oct 2006
Location: New York
Posts: 11
Thanks: 0
Thanked 0 Times in 0 Posts
iTrader Score: 0 reviews
View xzhuang's Photo Gallery
Thanks, ghost_ryder, this makes a lot sense to me..will try to
unplug that one tomorrow. Supposedly, it should turn on the fan
too.
xzhuang is offline   Reply With Quote
Old 12-28-2006, 01:11 AM   #9 (permalink)
Senior TN Member
 
Join Date: Apr 2002
Location: Bellingham, WA
Posts: 4,022
Gameroom cash: $168955
Thanks: 0
Thanked 29 Times in 28 Posts
iTrader Score: 0 reviews
View toyotaspeed90's Photo Gallery
actually that's strange.... must be a 1992 thing.... never seen one in the radiator on a toyota.... (except in an mr2... but that's a completely different ballpark)...

generally the 1 wire with white connector in the t-stat housing is the radiator control.....

green/brown (each 2 wire) are for CSI and ecu.....

the single wire is then for the gauges.....
__________________
1) 2004 IS300 Manual/LSD/Sportdesign 2) 2010 Corolla S 5 speed 3) 1986 MR2 "MK1.22" 5sfe/s54 swap 3) 1995 Ford Explorer 4x4, TT/AAL/custom shackle lift, 31"s
toyotaspeed90 is offline   Reply With Quote
Old 12-28-2006, 09:24 AM   #10 (permalink)
New TN User
 
Join Date: Oct 2006
Location: New York
Posts: 11
Thanks: 0
Thanked 0 Times in 0 Posts
iTrader Score: 0 reviews
View xzhuang's Photo Gallery
Just let you know that I unplugged the one on the radiator today, it actuated
the fan immediately.
So, I think this is the second fan switch. The reason it has two wires instead of
one wire is because the two are cascaded together, the one on the themostat
housing then connects to ground. As long as one of the switches is open,
the fan should be turned on.
This is not documented on the electrical diagram of Chilton manual, so I
suspect it is optional, shorting the switch (in case your radiator doesn't have
a place to put in the fan switch, possible?) will leave only one switch functional.

Last edited by xzhuang; 12-28-2006 at 09:26 AM.
xzhuang is offline   Reply With Quote
Old 12-28-2006, 09:39 AM   #11 (permalink)
All-Trac Guru
 
ghost_ryder35's Avatar
 
Join Date: Oct 2006
Location: Wisconsin
Posts: 682
Thanks: 1
Thanked 0 Times in 0 Posts
iTrader Score: 0 reviews
View ghost_ryder35's Photo Gallery
chilton and haynes suck. i have a copy of the fsm, pm me your e-mail and I will e-mail you the book
__________________
89 Corolla All-Trac Sedan White 188,xxx (Sold)
89 Corolla All-Trac Wagon Blue 172,xxx (Current)
ghost_ryder35 is offline   Reply With Quote
Sponsored Links
Advertisement
 
Reply

  Toyota Nation Forum : Toyota Car and Truck Forums > Toyota Passenger and Sports Car Forums > Corolla and Matrix Forum > Archived Corolla threads

Bookmarks

Thread Tools
Display Modes

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
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Gen 3 I4 Radiator Change/ Thermostat Change RningOnFumes 3rd & 4th Generation (19921996 & 19972001) 56 01-31-2013 05:41 PM
HELP! Car won't Rev past 3000rpms supraskyguy 9th Gen Corolla/1st Gen Matrix (2003-2008) 26 09-19-2007 11:49 AM
List of Toyota CEL Codes Marc M 2nd Generation (2005+) 2 03-30-2006 12:49 PM
List of Toyota CEL Codes Marc M 2nd Generation (2005+) 0 03-29-2006 11:01 AM

Powered by vBadvanced CMPS v3.2.2

All times are GMT -5. The time now is 09:29 PM.



Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.6.0
Garage Plus vBulletin Plugins by Drive Thru Online, Inc.
ToyotaNation.com is an independent Toyota/Lexus enthusiast website. ToyotaNation.com is not sponsored by or in any way affiliated with Toyota Motor Sales, USA, Inc. The Toyota, Lexus and Scion names and logos are trademarks owned by Toyota Motor Sales, USA, Inc.