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4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 08-02-2015
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Icon9 1999 Ford Ranger XL Shows Hot

Hello Everyone;
Thank you for allowing me to post my issue.
I hope I am posting in the proper area, if not, please excuse my ignorance and place it in the proper forum.

I have a 1999 Ford Ranger, 4x2, 189,000 miles, 6.0 4.0L engine.
I had to replace the odometer from a salvage yard not long ago, but my issue is the "Cold/Hot" Temp Gauge shows almost on "H". I changed out the Coolant today along with the Thermostat. I thought I had the issue resolved because it gauge initially started about halfway between C and H, but I guessed wrong. It eventually went all the way to H.

Can anyone provide me with some recommendations of where to go next.

Thank you again for the opportunity to post.
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Old 08-02-2015
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make sure that you connected the gauge the proper way

with that amount of miles on your engine . now is a good time to replace the coolant temperature sender
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Old 08-02-2015
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On the lower intake just above the thermostat housing you will see two temp sensors screwed into the intake.
One will have 2 wires, that is the ECT sensor only used by the computer.
The other will have 1 wire, this is a temp sender only used by the dash board gauge.

The 1 wire sender is the one you want to test.
Engine cold, key on
temp gauge should be at C(cold)
remove the 1 wire from the sender, unplug connector
gauge should drop to below C

Get a piece of wire and push it into the connector make contact with the 1 wire
Ground the other end of that added wire, to engine or battery negative
Gauge should move all the way up to HOT

If above happens exactly this way then wire and gauge are fine, replace temp sender, make sure parts guy doesn't give you the 2 wire sensor, you want the 1 wire SENDER.

If gauge shows above C when engine is stone cold then yes, your wiring in the dash is the problem
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Old 08-02-2015
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Thanks Ron, will give it a try tomorrow and follow-up with ya here.

Much thanks again.
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Old 08-04-2015
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Hello RonD again;
I may have resolved my H issue, I replaced the 1 wire sensor yesterday and had the same issue, I noticed the other sensor was cracked, so I replaced it today. Hopefully I got it.

Wish this ol' shade-tree sweatin' wanna-be mechanic luck.


Thanks
David
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Old 08-10-2015
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I may have cross-posted, sorry if I did, didn't mean to.
In order to take the connector off of the Gauge, I would have to disassemble the dash and remove the cluster. Am I right?
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Old 08-10-2015
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Yes, all the gauge wiring is on the back of the instrument cluster
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Old 08-11-2015
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Thanks for the reply.
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