Temp real low/wrong - Ranger-Forums - The Ultimate Ford Ranger Resource


General Technical & Electrical General technical and electrical discussion for the Ford Ranger that does not fit in any other sub-forum.

Reply
 
LinkBack Thread Tools Search this Thread
  #1  
Old 08-27-2010
Member
Thread Starter
 
Join Date: Aug 2010
Location: Seabrook, Texas
Posts: 13
Temp real low/wrong

I have a 98 2.5 5speed. Just bought it so I have no history on the truck.

When I got it I noticed the temp is really low. I know this has been covered 1000s of times but this is a little different. New to the site not sure if you have search police. Anyway. I replaced the thermostat. I tested the old and new both were good. Still low. I replaced the temp sensor. Still low. Just bought a tach cluster from a 01 2.5 5speed ranger. Works perfect but the temp still reads low. I have heat. I'm not to worried but I would like to know for sure that the truck is reaching closed loop for peak mpgs.

What's the deal?
Also what's the sensor next to the temp sensor?

Thanks in advance.
-Ford
Reply With Quote
  #2  
Old 08-27-2010
Member
Thread Starter
 
Join Date: Aug 2010
Location: Seabrook, Texas
Posts: 13
Well I inspected the other sensor next to the one I already replaced and it seems to be the same thing. So I'm guessing one is for the gauge and one is for the ecu? I must have changed the ecu one on the back. I just bought another sensor and will change it tonight when it cools.

Ill check back with results.
Reply With Quote
  #3  
Old 08-27-2010
Member
Thread Starter
 
Join Date: Aug 2010
Location: Seabrook, Texas
Posts: 13
Any ideas?

The new gauge is not the same. It is the back one. I ordered one from autozone that they said will work.
Reply With Quote
  #4  
Old 08-28-2010
drppdyllwrngr's Avatar
Member
iTrader: (4)
 
Join Date: Sep 2007
Location: wilmington, nc
Posts: 2,096
my 4.0 always reads lower than i think it should. when i get stuck in traffic on a very hot day, it goes up to where i would think it's normal.
Reply With Quote
  #5  
Old 09-01-2010
Member
Thread Starter
 
Join Date: Aug 2010
Location: Seabrook, Texas
Posts: 13
Mine doesnt reach the so called "normal" area. Sits right above the c-line.

After going to all the local auto parts store they don't have my part. They all have the temp sensor for the ecu but not the temp sending unit. What's up with that?
Reply With Quote
  #6  
Old 09-02-2010
cheese_man's Avatar
Member
iTrader: (1)
 
Join Date: Nov 2009
Location: arthur
Posts: 2,100
dealership
Reply With Quote
  #7  
Old 09-02-2010
Blhde's Avatar
Member
 
Join Date: Oct 2005
Location: Northern IL
Posts: 2,804
I think your wiring is causing an issue. High resistance equals low readings.

Quote:
Measure the resistance between instrument cluster C215-3, circuit 39 (RD/WH), and water temperature indicator sender unit C170, circuit 39 (RD/WH).
Quote:
Measure the resistance between instrument cluster C215-3, circuit 39 (RD/WH), and ground.

l Is the resistance less than 5 ohms between instrument cluster C215 and water temperature indicator sender unit C170, and greater than 10,000 ohms between instrument cluster C215 and ground?

Yes

Go to B3.

No

REPAIR circuit 39 (RD/WH). TEST the system for normal operation.
While you have the dash ripped apart check the voltage at the cluster.

Quote:
Measure the voltage between instrument cluster C216-1, (tachometer cluster), or C215-8, (standard cluster), circuit 640 (RD/YE), and ground.

l Is the voltage greater than 10 volts?

Yes

Go to B4.

No

REPAIR circuit 640 (RD/YE). TEST the system for normal operation.

Quote:
Check the resistance between instrument cluster C215-2, circuit 570 (BK/WH), and ground.

l Is the resistance less than 5 ohms?

Yes

Go to B5.

No

REPAIR circuit 570 (BK/WH). TEST the system for normal operation.

If all these are good. It says to replace the cluster. What are the odds you got 2 bad clusters?
Reply With Quote
  #8  
Old 09-02-2010
jtfoxman's Avatar
Member
 
Join Date: Jun 2005
Location: The Poconos
Posts: 891
What is your t-stat temp rating? Not sure if you put the same temp rating back in but I had a 195 and it would do that. Replaced it with a 198 and it goes half way up now.
Reply With Quote
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Low pressure and Temp in my cooling system Ranger XL SOHC - 2.3L & 2.5L Lima Engines 0 11-24-2013 05:59 PM
heat lukewarm and temp low! notpunkdesign General Technical & Electrical 5 02-10-2011 04:41 PM
Oil pressure guage needle on wrong side of low-end pin bobcatos General Technical & Electrical 1 08-04-2010 10:09 PM
LOW LOW LOW RPMS JRacer 4.0L OHV & SOHC V6 Tech 23 05-07-2009 12:25 AM
constant low temp clintusaf 4.0L OHV & SOHC V6 Tech 14 04-02-2008 10:10 AM


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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -6. The time now is 04:45 PM.


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.