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Old 01-02-2011, 08:55 PM
range0rover range0rover is offline
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Default Re: Coolant temp. sensor

did you get an answer for this? my 2000 2.5 4cyl had an always-low gauge. I bought a new sensor (gauge sensor) but wasnt the problem. by the way, the wire plug for the coolant sensor will only fit the coolant sensor and not the gauge sensor and vice-versa...

anyway, before installing the new sensor I read several threads that caused me to doubt whether or not I even needed a new gauge sensor. so before I installed the new gauge sensor (and made it so I couldnt return it to the store) I tested the old one by removing it, rehooking the wire, boiling water inside, pouring in a cup, placing the old sensor in cup and, walla....the gauge went to the middle!

that meant my truck had just been running cool all this time (even though the heater worked) and that the thermostat was bad. I replaced it and bingo, gauge works and so does everything else.
2000 Ranger XLT, Ext Cab, 4x2, 2.5L 4 cyl, 5spd man

no modifications

Last edited by range0rover; 01-06-2011 at 09:22 PM.
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Old 07-16-2011, 10:03 AM
PhdNPrerunners PhdNPrerunners is offline
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Join Date: Jul 2011
Posts: 86
Default Re: Coolant temp. sensor

I am bumping an old thread cause I didnt want to start another thread. My 96 4.0 ranger temp gauge in the truck will go to the middle and then it will keep moving up and down the whole time I am driving. Does that sound like the coolant temp sensor or the gauge sensor? Any help will be greatly appreciated
DD: 2011 Hond Civic LX-S
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Old 07-20-2011, 12:32 PM
lvbluesboy lvbluesboy is offline
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Default Re: Coolant temp. sensor

Just as an FYI - if your 2004 XLT has the same coding as my 2005 Edge (it probably does):

Both senders have two wires - They are:

PCM sender - light green/red and gray/red
Gauge sender - red/white and black/white

The senders themselves are the same part - just two of them

These are striped wires and yes it is easier to get at the temperature housing with the intake out of the way. Find instructions for the job. There is a lot of stuff you do NOT have to take off that it looks like you do. I know that ALLDATADIY has some good pictures. I used those when I did mine.

Hope this helps.
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Old 07-20-2011, 12:37 PM
FireRanger FireRanger is offline
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Default Re: Coolant temp. sensor

The PCM sensor should have 4 or 5 wires on it. They are not the same.
2003 Edge 4.0 4wd

How to: Aux light wiring, relays, & fuses
Info: 300+ intake threads here on FRF
Info: HID Projectors
How To: NO HEAT Troubleshooting Guide
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Old 07-21-2011, 05:52 AM
lvbluesboy lvbluesboy is offline
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Default Re: Coolant temp. sensor

Well I don't know for sure on his 2004, FireRanger, but my 4.0L 2005 has two identical sensors according to Ford, but the wiring is as I have shown above. In fact, if you look at the wiring diagram for the my truck, the wire color codes are there.

Maybe yours is different. If you check with your local Autozone or whatever they will usually have the sensor and usually under one part number for a "coolant temperature sensor". Depending upon the year of the motor and when it was manufactured during the year, they can be different.

I have found it best is some cases to buy the parts through my local Ford dealer. They match the parts to your VIN and make sure they are correct. At least Team Ford here in Vegas does. If you order online here the prices are just as good as any auto parts store. I know that won't be the case in other parts of the country, but it works for me.

At any rate, you need to be very careful changing the sensors as you can break the connector and then it is ruined.
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Old 12-17-2011, 10:30 AM
stephen6789 stephen6789 is offline
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Default Re: Coolant temp. sensor

I know this is an old thread, but my google search led me here first, and I left just as confused. First off, anyone else needing this help... the pics listed above are NOT coolant sensors for a 2004 V6 4.0L engine. no threads,these have a retainer clip.
There are two sensors behind the thermostat and they look absolutely IDENTICAL, except for the part # stamped on the side. Both even have the same plug design with two wires. Dumb design, I know. The one on the left is what runs to the computer ( 3L8A-12A648-BA ) the one on the right runs to the gauge.
If there's a third one, way off to the left, maybe that's the air intake temp sensor?
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Old 12-17-2011, 01:33 PM
JULIUS JULIUS is offline
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Posts: 149
Default Re: Coolant temp. sensor

I originated the thread & my gauge started working after I tapped on top of the connector.Heat is fine & temp gauge is in the middle.
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