E-fan Thermal Switch - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Wrangler Forums > YJ Wrangler Technical Forum > E-fan Thermal Switch

LOCKERS!!!! - ARB, Auburn, Detroit, Eaton, OX, Spartan, YuRIGID LED Light Blowout Sale - All Sizes, All Series, all ECGS Black Friday Sale!!

Reply
Unread 03-22-2012, 07:10 PM   #1
Louie4
Powah Injanir
 
Louie4's Avatar
1993 YJ Wrangler 
 
Join Date: Aug 2008
Location: Raleigh, NC
Posts: 9,924
E-fan Thermal Switch

I know this topic has been covered before but upon my searching its been bits and pieces from threads on temperature probes and sensors. I have a Taurus fan installed and I'm using a Hayden adjustable thermostat with a temp probe in the radiator. It works OK but it rattle around after a time. I've thought about using JB weld and other methods to hold it but I want a more permanent solution that keeps the probe separate from the radiator in case I need to remove it.

Here's what I've come up with. I plan on using the plug in the block I saw in my Haynes manual and then on the block. I've found in my research that it's 3/8" -NPT thread and I found a thermal switch from Summit that turns on at 195* and turns off at 185*.

http://www.summitracing.com/parts/PRF-30110/

Does anyone see a problem with this?

img_1910.jpg   img_1907.jpg  
__________________
Lou

I have a jeep...and it is modified...I win.

YJOTM July 2012
YJOTM February 2014

Louie4's YJ Build
Poison Spyder Fender Install
Warn M8000 Rebuild Adventure
University of Georgia
Louie4 is offline   Reply With Quote Quick reply to this message
Unread 03-22-2012, 07:12 PM   #2
Louie4
Powah Injanir
 
Louie4's Avatar
1993 YJ Wrangler 
 
Join Date: Aug 2008
Location: Raleigh, NC
Posts: 9,924
I plan on running the wires to the O2 sensor wiring and up to the top of the motor and over to the relay. Here is a pic from Summit.
prf-30110_w.jpg  
__________________
Lou

I have a jeep...and it is modified...I win.

YJOTM July 2012
YJOTM February 2014

Louie4's YJ Build
Poison Spyder Fender Install
Warn M8000 Rebuild Adventure
University of Georgia
Louie4 is offline   Reply With Quote Quick reply to this message
Unread 03-22-2012, 10:11 PM   #3
TSEJEEPERS
Registered User
1993 YJ Wrangler 
 
Join Date: Dec 2003
Location: Morton IL
Posts: 5,014
Yes that will work.
The only problems are, one of the plugs in the block is right behind the motor mount and the other one is right behind one of the exhaust manifold tubes.
If you can get them out and the sensor back in it will work.
This is another option. http://www.steigerperformance.com/
Not sure if you have seen this thread or not.
http://www.jeepforum.com/forum/f12/f...cheap-1325896/
__________________
93 YJ SOA 2" springs front, XJ springs rear w/main leaf added, High pinon 9 inch rear detroit locker front Dana 44 ARB 4.56 Gears, 36 inch Irok tires too much to list. www.mijc.org
TSEJEEPERS is offline   Reply With Quote Quick reply to this message
Unread 03-23-2012, 05:54 AM   #4
Louie4
Powah Injanir
 
Louie4's Avatar
1993 YJ Wrangler 
 
Join Date: Aug 2008
Location: Raleigh, NC
Posts: 9,924
I think I can get the plug out near the engine mount. It will take contorting but I think I can do it. I followed that thread you referenced and there's a lot of great info but to me this is a simpler solution that's utilizing the ports on the engine block. I could put a in hose tap but if I can just swap out that plug with the switch, run two wires to it then I'll be in good shape. That's sounds so much easier in writing. Just wait till I put it into action. I may have wished I would done it with a hose tap.
__________________
Lou

I have a jeep...and it is modified...I win.

YJOTM July 2012
YJOTM February 2014

Louie4's YJ Build
Poison Spyder Fender Install
Warn M8000 Rebuild Adventure
University of Georgia
Louie4 is offline   Reply With Quote Quick reply to this message
Unread 03-23-2012, 06:23 AM   #5
kphimself
Registered User
2006 TJ Wrangler 
 
Join Date: Nov 2010
Location: Va Beach, va
Posts: 196
Have you looked into running a Line switch, they run about 40 bucks. check out derale's line of products. I put one on my dads mustang after his sensor fell out in traffic and haven't had any issues since then.
kphimself is offline   Reply With Quote Quick reply to this message
Unread 03-23-2012, 07:26 AM   #6
Berniebikes
Registered User
1988 YJ Wrangler 
 
Join Date: May 2010
Location: Williamsburg, VA
Posts: 738
Your temp is too low. I 'm thinking it will affect performance on your engine. The motor is designed to run warmer than 195. Also, a single switch will not control both fan speeds. See the link in post 3 and read thru that. I know that you probably have been ok with a controller using low speed only, but suggest if you are getting rid of your hayden controller you look into doing something that will give you both fan speeds automatically. I installed mine, including the fan for less than $75. For less than $30 you could wire up the dual fan controller and switches and have both high and low speeds at the correct temps.
Berniebikes is offline   Reply With Quote Quick reply to this message
Unread 03-23-2012, 07:27 AM   #7
Louie4
Powah Injanir
 
Louie4's Avatar
1993 YJ Wrangler 
 
Join Date: Aug 2008
Location: Raleigh, NC
Posts: 9,924
Quote:
Originally Posted by kphimself View Post
Have you looked into running a Line switch, they run about 40 bucks. check out derale's line of products. I put one on my dads mustang after his sensor fell out in traffic and haven't had any issues since then.
I'm not sure what a line switch is. The switch I linked to is from Summit and it's $40 as well. I live near one so shipping is not a factor.
__________________
Lou

I have a jeep...and it is modified...I win.

YJOTM July 2012
YJOTM February 2014

Louie4's YJ Build
Poison Spyder Fender Install
Warn M8000 Rebuild Adventure
University of Georgia
Louie4 is offline   Reply With Quote Quick reply to this message
Unread 03-23-2012, 08:08 AM   #8
Que89YJ
Web Wheeler
1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 15,608
Read through TSJeepers link. There is a bunch of good info there and I don't want to rehash it. There are reasons for the location of the sensor, heat range, etc. In fact it would be a good thread to build on with what you want to do. I am using the Hayden and I will just end up cutting the probe and attaching a sensor to it when I get a chance.
Que89YJ is offline   Reply With Quote Quick reply to this message
Unread 03-23-2012, 09:04 AM   #9
Louie4
Powah Injanir
 
Louie4's Avatar
1993 YJ Wrangler 
 
Join Date: Aug 2008
Location: Raleigh, NC
Posts: 9,924
Quote:
Originally Posted by Berniebikes View Post
Your temp is too low. I 'm thinking it will affect performance on your engine. The motor is designed to run warmer than 195. Also, a single switch will not control both fan speeds. See the link in post 3 and read thru that. I know that you probably have been ok with a controller using low speed only, but suggest if you are getting rid of your hayden controller you look into doing something that will give you both fan speeds automatically. I installed mine, including the fan for less than $75. For less than $30 you could wire up the dual fan controller and switches and have both high and low speeds at the correct temps.
That's something I was wondering about as well. I would rather have the fan cut on between 200-210 and off around 190. I have an 85 amp continuous duty relay on the way for the high speed as we speak. I plan on wiring it in to a switch unless I go down the Volvo dual temp relay path. I initially intended to do that and even picked up the relays but the wires and connectors for them were junk so I just scrapped the idea. This was before the thread TSEJEEPERS posted was created but I had already done a little research on the links within that thread.

Quote:
Originally Posted by Que89YJ View Post
Read through TSJeepers link. There is a bunch of good info there and I don't want to rehash it. There are reasons for the location of the sensor, heat range, etc. In fact it would be a good thread to build on with what you want to do. I am using the Hayden and I will just end up cutting the probe and attaching a sensor to it when I get a chance.
I've been through it (not with a fine toothed comb though) and it's great info. I may look at finding and in hose tap or maybe fab one out of exhaust pipe and use a spindle nut. All possibilities. The main reason I want to go through with my plan is to find another way that may be simpler. My main concerns are the temp switch location and the temp range it cuts on and off.

I'll go through that thread again.
__________________
Lou

I have a jeep...and it is modified...I win.

YJOTM July 2012
YJOTM February 2014

Louie4's YJ Build
Poison Spyder Fender Install
Warn M8000 Rebuild Adventure
University of Georgia
Louie4 is offline   Reply With Quote Quick reply to this message
Unread 03-23-2012, 09:19 AM   #10
Que89YJ
Web Wheeler
1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 15,608
Go into the thermostat housing and tap it. Try using your Hayden like I suggested. It is adjustable. The question is if the sensor range is close to the probe on the Hayden. If you are into it cut the sensor on the hayden and read the resistances on both.
Que89YJ is offline   Reply With Quote Quick reply to this message
Unread 03-23-2012, 09:28 AM   #11
Louie4
Powah Injanir
 
Louie4's Avatar
1993 YJ Wrangler 
 
Join Date: Aug 2008
Location: Raleigh, NC
Posts: 9,924
Quote:
Originally Posted by Que89YJ View Post
Go into the thermostat housing and tap it. Try using your Hayden like I suggested. It is adjustable. The question is if the sensor range is close to the probe on the Hayden. If you are into it cut the sensor on the hayden and read the resistances on both.
I'm OK with drilling and tapping the t-stat housing. So you're suggesting I cut the probe off the Hayden, measure the resistance on that then measure the resistance on the sensor I plan on purchasing?
__________________
Lou

I have a jeep...and it is modified...I win.

YJOTM July 2012
YJOTM February 2014

Louie4's YJ Build
Poison Spyder Fender Install
Warn M8000 Rebuild Adventure
University of Georgia
Louie4 is offline   Reply With Quote Quick reply to this message
Unread 03-23-2012, 09:59 AM   #12
Louie4
Powah Injanir
 
Louie4's Avatar
1993 YJ Wrangler 
 
Join Date: Aug 2008
Location: Raleigh, NC
Posts: 9,924
Reply

I can easily drill and tap the thermostat housing on the flat spot. Heck I can forget the side of the block.

__________________
Lou

I have a jeep...and it is modified...I win.

YJOTM July 2012
YJOTM February 2014

Louie4's YJ Build
Poison Spyder Fender Install
Warn M8000 Rebuild Adventure
University of Georgia
Louie4 is offline   Reply With Quote Quick reply to this message
Unread 03-23-2012, 10:12 AM   #13
jbolty
Moderator
 
jbolty's Avatar
1990 YJ Wrangler 
 
Join Date: Jun 2007
Location: San Diego, CA
Posts: 15,972
I went through all this and finally just went with the radiator probe and adjustable controller. All the on/off switches I could find only claimed to be accurate to about +- 10 degrees. So on at 200 and off at 190 could just as easily be on at 210 and off at 180.

The main issue with any sender is to make sure it's fully touching the water. I've seen a few writeups using tees in the hoses but those tend to create an air pocket or an eddy and give false readings. Threading it into the water jacket or thermostat housing avoids that problem, but still they are not all the accurate. It might not matter if it's off a few degrees, since most cars have that style, but personally I like to have more control.
__________________
.
"The right to be heard does not necessarily include the right to be taken seriously." —Hubert Humphrey
.
If you live within wheeling distance of San Diego county, click here
jbolty is offline   Reply With Quote Quick reply to this message
Unread 03-23-2012, 10:21 AM   #14
Que89YJ
Web Wheeler
1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 15,608
Yes. If the resistance is even remotely close you can use the Hayden setup It is adjustable to make up for resistance differences with harnesss length and sensor resistance differences. Everyone is going to the high current relay and it isn't necessay unless you are turning on the high speed fan by itself.
Que89YJ is offline   Reply With Quote Quick reply to this message
Unread 03-23-2012, 10:46 AM   #15
Berniebikes
Registered User
1988 YJ Wrangler 
 
Join Date: May 2010
Location: Williamsburg, VA
Posts: 738
Maybe I got lucky, but my 2 speed switch comes on at 201.2, it's rated for 203 degrees. High speed is 216 but I have never gotten the engine that hot. It switches off at 194, rated at 195, which is about as close as you can get.
Berniebikes is offline   Reply With Quote Quick reply to this message
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.
Note: All free e-mails have been banned due to mis-use. (Yahoo, Gmail, Hotmail, etc.)
Don't have a non-free e-mail address? Click here for a solution: Manual Account Creation
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.


Thread Tools


Suggested Threads





Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.