temp guage - 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 12-23-2006
Member
Thread Starter
 
Join Date: Oct 2005
Location: novi michigan
Posts: 161
temp guage

i have a 98 with the 4.0 and today i replaced my coolant temp sensor because the guage was always reading cold, and would not move. i drove the truck after i replaced the sensor and still showes cold. what do i do now?
Reply With Quote
  #2  
Old 12-23-2006
V8 Level II's Avatar
RF Veteran
iTrader: (4)
 
Join Date: Nov 2004
Location: Michigan
Posts: 7,833
1)
There are two coolant temp sensors.

A two wire sensor reports the coolant temp to the PCM.
The single wire sensor is for the temp gauge.

If you replaced the two wire sensor, that has no affect on the operation of the gauge.



2)
Let say that you already replaced the single wire sensor and that didn't fix it. If the other gauges are working, then you know that the cluster has power and ground. Once you have eliminated the sensor, there is nothing to check except but the gauge and the red/white sensor wire.
Reply With Quote
  #3  
Old 12-23-2006
Blhde's Avatar
Member
 
Join Date: Oct 2005
Location: Northern IL
Posts: 2,804
Do you have heat?
Reply With Quote
  #4  
Old 12-23-2006
Member
Thread Starter
 
Join Date: Oct 2005
Location: novi michigan
Posts: 161
i replaced the sensor with the single wire near the thermostat where is the other sensor located and yes all guages and heat work
Reply With Quote
  #5  
Old 12-23-2006
V8 Level II's Avatar
RF Veteran
iTrader: (4)
 
Join Date: Nov 2004
Location: Michigan
Posts: 7,833
Quote:
Originally Posted by 93rangerxlt4.02007
i replaced the sensor with the single wire near the thermostat where is the other sensor located and yes all guages and heat work
You don't need to replace the two wire because it doesn't affect the gauge operation.

My next move would be to do a continuity check on the red/white wire. After that, all you have left is a problem with the gauge segment.
Reply With Quote
  #6  
Old 12-24-2006
reelfishin's Avatar
Member
 
Join Date: Oct 2006
Location: Right here!
Posts: 157
Check the actual operating temp to be sure, if it's not at least 190 at the engine your thermostat is most likely stuck.
You can do a quick test of the gauge by simply touching the single wire off the coolant temp sender to ground with the key on, (red with white wire as stated above).
The coolant temp sender reads between 74 ohms cold and 9.7 ohms when hot.
Lowering the resistance or grounding the wire should make the gauge read high.
If grounding the wire does not move the gauge, you either have a wiring problem or a bad guage.
Reply With Quote
  #7  
Old 12-26-2006
Member
Thread Starter
 
Join Date: Oct 2005
Location: novi michigan
Posts: 161
got the damn thing to work. the probelm was the stoners up at murrays auto parts gave me the wrong damn sensor/sending unit. i went to my local auto parts store and got a diffrent one put that in and wala it works. now my truck shoulnt be gettting 7-10 mpg now maybe 14 or more lets hope
thanks for ur help and dont buy stuff from murrays discount auto
Reply With Quote
  #8  
Old 12-27-2006
Member
 
Join Date: Dec 2005
Location: MI, U.S.A.
Posts: 322
you could also put a seperate temp gauge like autometer...ect. with a seperate sending unit. I put mine in the steel pipe that goes to the return of the radiator.
Reply With Quote
  #9  
Old 01-01-2007
Member
 
Join Date: Sep 2006
Location: Pompton Lakes, NJ
Posts: 10
You are not getting 7 to 10 mpg's because on the temp sending unit to the guage. That has nothing to do with the computer. It is only for the guage. If you are having temperature related computer problems you need to replace the other one on the other side. Good Luck
Reply With Quote
  #10  
Old 01-01-2007
Needforspeed3685's Avatar
Member
 
Join Date: Aug 2005
Location: Lowell, AR
Posts: 1,836
Quote:
Originally Posted by RNGMSTR
you could also put a seperate temp gauge like autometer...ect. with a seperate sending unit. I put mine in the steel pipe that goes to the return of the radiator.
That steel pipe was your transmission fluid cooler lines. Did it have red fluid in it???
Reply With Quote
  #11  
Old 01-01-2007
Blhde's Avatar
Member
 
Join Date: Oct 2005
Location: Northern IL
Posts: 2,804
Quote:
Originally Posted by Needforspeed3685
That steel pipe was your transmission fluid cooler lines. Did it have red fluid in it???

The upper rad hose with the tstat housing has a metal elbow.
Reply With Quote
  #12  
Old 04-08-2007
florida ranger's Avatar
Member
 
Join Date: Sep 2006
Location: Lehigh Acres
Posts: 73
I am having the same type issues and I am going to replace both. I got a code P0125. I have not had any overheating issues, but since I have had the truck the temp gauge either does not move (during the colder months) or moves little (during the hotter months) with the AC running. Do I need to drain the cooling system to replace these sensor/sender?

Thanks Jeff
Reply With Quote
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Tranny temp guage installed.... Crunchy General Ford Ranger Discussion 12 05-09-2010 12:04 PM
Changed Thermostat now temp guage not working Rangerguy 4.0L OHV & SOHC V6 Tech 5 07-09-2009 03:40 PM
temp guage? 3.0Backfire 2.3L & 2.5L I4 Tech 5 07-30-2008 12:09 PM
cluster help/temp guage badluck13 Interior Semi-Tech 0 04-05-2008 02:07 PM
Trans Temp Guage RedRanger02 Interior Semi-Tech 26 04-29-2006 01:13 PM


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 04:59 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.