Notices
C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette

Electric Fans? Where is Your Sensor?

 
Old 05-11-2019, 09:39 AM
  #1  
Street Rat
CF Senior Member
Support Corvetteforum!
Thread Starter
 
Street Rat's Avatar
 
Member Since: Aug 2010
Location: Central Texas
Posts: 4,875
Received 309 Likes on 287 Posts
Default Electric Fans? Where is Your Sensor?

Hello All,

I'm trying to diagnose a cooling problem. I have the dual Spal fan set up on my DewItt's radiator. I'm using a fan controller. I'm wondering if I placed the sensor for the fans in the correct location? It is in the radiator hose attached from the radiator to the thermostat housing.

Where did you place your temperature probe or sensor in your electric fan installation?

Craig
Street Rat is offline  
Old 05-11-2019, 10:04 AM
  #2  
Mooser
CF Senior Member
 
Member Since: Apr 2011
Location: Toronto Ontario
Posts: 5,498
Received 486 Likes on 430 Posts
Default

Mine was in the passenger cylinder head when using the spal controller, was going to add another to the drivers head to run separate temps for each fan but then went to a PWM controller and now the sensor is on the rad itself, totally different setup
M
Mooser is online now  
Old 05-11-2019, 10:10 AM
  #3  
Gunfighter13
CF Senior Member
 
Gunfighter13's Avatar
 
Member Since: Mar 2014
Location: Texas
Posts: 187
Received 37 Likes on 36 Posts
Default

Mine is in the passenger side head. Same place for all my builds.
Gunfighter13 is offline  
Old 05-11-2019, 10:10 AM
  #4  
Street Rat
CF Senior Member
Support Corvetteforum!
Thread Starter
 
Street Rat's Avatar
 
Member Since: Aug 2010
Location: Central Texas
Posts: 4,875
Received 309 Likes on 287 Posts
Default

Originally Posted by Mooser View Post
Mine was in the passenger cylinder head when using the spal controller, was going to add another to the drivers head to run separate temps for each fan but then went to a PWM controller and now the sensor is on the rad itself, totally different setup
M

What kind of temperatures were you running with either set up M?
Street Rat is offline  
Old 05-11-2019, 10:15 AM
  #5  
Mooser
CF Senior Member
 
Member Since: Apr 2011
Location: Toronto Ontario
Posts: 5,498
Received 486 Likes on 430 Posts
Default

Big Block so your mileage may vary
On the high precision -easy to read stock temp gauge
195-205 in traffic with it in the head, seemed to let it get too hot before they kicked in and they had a hard time pulling it back down with the engine not turning over and air flowing so it would just drop a bit and hold it, never overheated by any means
never gets above about 185 with the PWM controller now, they start to come on much lower at a lower RPM
M
Mooser is online now  
The following users liked this post:
Street Rat (05-13-2019)
Old 05-11-2019, 11:56 AM
  #6  
ignatz
CF Senior Member
 
ignatz's Avatar
 
Member Since: May 2004
Location: los altos hills california
Posts: 1,937
Received 218 Likes on 178 Posts
Default

Interesting question. Have an LS3 and my setup came delivered with the sensor just under the steam line. Fans almost never come on while driving, but when I park the car, they tend to come on at idle. I haven't thought about why that might be.

Craig: Wouldn't your placement be the coolest part of your system. Mine would be pretty close to the hottest.
ignatz is offline  
Old 05-11-2019, 12:17 PM
  #7  
Mooser
CF Senior Member
 
Member Since: Apr 2011
Location: Toronto Ontario
Posts: 5,498
Received 486 Likes on 430 Posts
Default

Originally Posted by ignatz View Post
Interesting question. Have an LS3 and my setup came delivered with the sensor just under the steam line. Fans almost never come on while driving, but when I park the car, they tend to come on at idle. I haven't thought about why that might be.
.....


Mine more or less does the same, as long as i'm moving at a half decent rate there's enough air coming through the rad to keep it more or less within temp, but when I stop or am going in traffic /around town, there's just not enough air going through the rad to make much difference, plus all the air under the hood just sitting there doesn't help
Mooser is online now  
Old 05-11-2019, 12:26 PM
  #8  
Street Rat
CF Senior Member
Support Corvetteforum!
Thread Starter
 
Street Rat's Avatar
 
Member Since: Aug 2010
Location: Central Texas
Posts: 4,875
Received 309 Likes on 287 Posts
Default

Originally Posted by Mooser View Post
Mine more or less does the same, as long as i'm moving at a half decent rate there's enough air coming through the rad to keep it more or less within temp, but when I stop or am going in traffic /around town, there's just not enough air going through the rad to make much difference, plus all the air under the hood just sitting there doesn't help
This is my issue also M.
Runs about 195 regularly. When I drive in slower traffic it hits 210. Never hotter. But I don't like running that hot. Summer isn't even here yet.
Street Rat is offline  
Old 05-11-2019, 01:17 PM
  #9  
akdale
CF Senior Member
 
akdale's Avatar
 
Member Since: Jul 2013
Location: Palmer Alaska
Posts: 249
Received 4 Likes on 4 Posts
Default

Heat has been an issue I have fought. Ironic since I live in Alaska. Pushing 10lbs of boost so my combustion temps are high. My sensor is in drivers side head. dual spals come on @190. Temp holds there even while pushing the engine hard on an 80F day. My total solution was Methanol injection, DeWitts radiator, Dual SPAL.
akdale is offline  
Old 05-11-2019, 04:26 PM
  #10  
carriljc
CF Senior Member
 
carriljc's Avatar
 
Member Since: Jan 2001
Posts: 2,465
Received 211 Likes on 199 Posts
Default

Intake manifold next to thermostat housing. EZ-EFI 2.0


Originally Posted by Street Rat View Post
Hello All,

I'm trying to diagnose a cooling problem. I have the dual Spal fan set up on my DewItt's radiator. I'm using a fan controller. I'm wondering if I placed the sensor for the fans in the correct location? It is in the radiator hose attached from the radiator to the thermostat housing.

Where did you place your temperature probe or sensor in your electric fan installation?

Craig
carriljc is offline  
Old 05-11-2019, 04:55 PM
  #11  
jim2527
CF Senior Member
 
jim2527's Avatar
 
Member Since: Apr 2003
Location: Tampa Florida
Posts: 15,651
Received 175 Likes on 153 Posts
Default

Originally Posted by Street Rat View Post
It is in the radiator hose attached from the radiator to the thermostat housing.
Craig
I don't know if it makes a difference but that's one of the absolute hottest positions and the position most likely to have steam pockets. Ideally would whatever position hits your trigger temp first be the best position?
jim2527 is offline  
Old 05-11-2019, 05:44 PM
  #12  
4-vettes
CF Senior Member
 
4-vettes's Avatar
 
Member Since: Nov 2006
Location: Brisbane QLD.
Posts: 342
Likes: 0
Received 3 Likes on 3 Posts
Cruise-In VIII Veteran
Default

I have mine in the intake manifold next to the thermostat housing as well. Been there for about a dozen years now. Works perfectly.
4-vettes is offline  
Old 05-11-2019, 06:12 PM
  #13  
Street Rat
CF Senior Member
Support Corvetteforum!
Thread Starter
 
Street Rat's Avatar
 
Member Since: Aug 2010
Location: Central Texas
Posts: 4,875
Received 309 Likes on 287 Posts
Default

Originally Posted by jim2527
I don't know if it makes a difference but that's one of the absolute hottest positions and the position most likely to have steam pockets. Ideally would whatever position hits your trigger temp first be the best position?
The maker of my fan controller says to put the temperature sensor in the outflow side near the bottom of the radiator.

Guess I'll try that next.

Last edited by Street Rat; 05-11-2019 at 06:13 PM.
Street Rat is offline  
Old 05-11-2019, 06:29 PM
  #14  
jim2527
CF Senior Member
 
jim2527's Avatar
 
Member Since: Apr 2003
Location: Tampa Florida
Posts: 15,651
Received 175 Likes on 153 Posts
Default

Originally Posted by Street Rat View Post
The maker of my fan controller says to put the temperature sensor in the outflow side near the bottom of the radiator.

Guess I'll try that next.
When I was scrounging the scrap yard looking for parts for my electric fan setup I noticed that BMW had sensors in that location.

Lets work off a few assumptions.... If the rad outlet is coolest and the inlet is hottest and your triggering off the outlet at 190 then whats the engine outlet temp? 200? 210? 220. I understand the logic of the lower outlet position but would think the upper inlet, being the hottest, would trigger the fans sooner. But as mentioned earlier, upper inlet has drawbacks, steam pockets and low fluid levels will throw things off.

This is all interesting to me as it relates but doesn't relate to my day job of operating the 'heart lung machine' which entails monitoring various water, blood and patient temperatures as well as gradients.
jim2527 is offline  
The following users liked this post:
Street Rat (05-13-2019)
Old 05-11-2019, 07:44 PM
  #15  
Mooser
CF Senior Member
 
Member Since: Apr 2011
Location: Toronto Ontario
Posts: 5,498
Received 486 Likes on 430 Posts
Default

Originally Posted by Street Rat View Post
The maker of my fan controller says to put the temperature sensor in the outflow side near the bottom of the radiator.

Guess I'll try that next.
That's where my Derale sensor is, seemed really strange but somehow works perfectly (plus it's a surface mount rather than inserted into the rad or even a push through probe. I guess technology keeps moving on

M
Mooser is online now  
The following users liked this post:
Street Rat (05-13-2019)
Old 05-11-2019, 07:54 PM
  #16  
Street Rat
CF Senior Member
Support Corvetteforum!
Thread Starter
 
Street Rat's Avatar
 
Member Since: Aug 2010
Location: Central Texas
Posts: 4,875
Received 309 Likes on 287 Posts
Default

Originally Posted by Mooser
That's where my Derale sensor is, seemed really strange but somehow works perfectly (plus it's a surface mount rather than inserted into the rad or even a push through probe. I guess technology keeps moving on

M
Gentlemen I think we have solution. I'm going to relocate my sensor and see what happens.
Street Rat is offline  
Old 05-11-2019, 08:05 PM
  #17  
mrvette
CF Senior Member
 
mrvette's Avatar
 
Member Since: Jul 1999
Location: Orange Park Florida
Posts: 61,912
Received 130 Likes on 124 Posts
Default

I have DPFI, and so the sensor in the head feeds the computer and it controls the dual spal fans.....

here is the trick though....like I have posted many times in these threads.....long time ago I noticed the smaller openings in stats that were rated 195f, 160 and 180 state had larger openings.....SO when the 195 stat opens the flow rate is less by design, today the 3 temps only control the opening temp, the FLOW RATE is the same as a 195f stat......so what need do is trim the skirts of the stat, OR drill holes in the skirt......

sure it takes a tad longer to warm up, so what?? maybe northern winter folks will need change stats with seasons......
mrvette is online now  
Old 05-11-2019, 08:32 PM
  #18  
Mooser
CF Senior Member
 
Member Since: Apr 2011
Location: Toronto Ontario
Posts: 5,498
Received 486 Likes on 430 Posts
Default

Originally Posted by Street Rat View Post
Gentlemen I think we have solution. I'm going to relocate my sensor and see what happens.
Keep in mind that mine is a PWM controller and the sensor is for something like 160 to start the fans at %60 speed and then keeps adjusting them to maintain a certain temp so that's why they are monitoring at that location.
M
Mooser is online now  
The following users liked this post:
Street Rat (05-13-2019)
Old 05-11-2019, 08:57 PM
  #19  
BLUE1972
CF Senior Member
 
BLUE1972's Avatar
 
Member Since: Oct 2008
Location: FARMINGDALE N..Y.
Posts: 4,122
Received 293 Likes on 261 Posts
Default

I run 2 sensors - one in the head 180* and one in the water neck 195* . If one fails the other will work.

Each sensor controls one fan. There are 2 fans and 2 relays.

Last edited by BLUE1972; 05-11-2019 at 09:00 PM.
BLUE1972 is offline  
The following users liked this post:
Street Rat (05-13-2019)
Old 05-12-2019, 08:07 AM
  #20  
Street Rat
CF Senior Member
Support Corvetteforum!
Thread Starter
 
Street Rat's Avatar
 
Member Since: Aug 2010
Location: Central Texas
Posts: 4,875
Received 309 Likes on 287 Posts
Default

Originally Posted by Mooser View Post
Keep in mind that mine is a PWM controller and the sensor is for something like 160 to start the fans at %60 speed and then keeps adjusting them to maintain a certain temp so that's why they are monitoring at that location.
M
Yes. Mine is an adjustable PWM controller from the AutoCoolGuy. Works on the same principle as yours.

Street Rat is offline  

Thread Tools
Search this Thread
Sponsored Ads
Vendor Directory

Contact Us - About Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: