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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 08-10-2015
Thread Starter
Join Date: Aug 2015
Location: Hamlet, NC
Posts: 20
Temp Gauge shows H

1999 Ford Ranger 6cyl, 4.0, Replaced the Instrument Cluster Panel TWICE and I get the same thing. The 2 Instrument Cluster Panels came out of an Explorer. The Salvage Yard showed me on the computer that they were an exact fit (guess I have a question about that).
It starts off just above :"C" when I first start in the morning and within abt 15 mins will go to "H". This happens everyday and everywhere I go.
I have changed out the 2 housing sensors, thermostat, radiator cap and coolant.

Any ideas from this "Shadetree Mechanic?

Thanks in advance.
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Old 08-11-2015
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Join Date: Jan 2014
Location: Vancouver, BC
Posts: 7,573
I guess first question is............is engine overheating?
Is overflow tank full or bubbling?

1999 Ranger will have 4.0l OHV, and a GEM module for "body" electrics
It has 2 temp sensing devices on the front lower intake of the engine
A 2 wire ECT sensor, used only by the computer
A 2 wire Temp Sender, used only by the dash board gauge

The 2 wire Sender is the one you need to test, it will have Red/white stripe wire and a Black/white stripe wire.
Remove it's connector
Get a Jumper wire and connect it to the Red/white stripe wire by pushing it into the connector

Turn on the key, engine off
Temp gauge should be below C on the gauge since wire is unhooked
Ground the other end of the jumper wire to the engine, or battery negative
Gauge should move up all the way to H or above

If both of these things happen then replace Sender, make sure you get a SENDER not ECT sensor.

What years were the explorer dash boards, and do the other gauges seem to work OK?
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Old 08-11-2015
Thread Starter
Join Date: Aug 2015
Location: Hamlet, NC
Posts: 20
Hello RonD
the overflowtank is full, not bubbling.
On my 4X2 1999 Ford Ranger (6cyl 4.0 OHC), there are 2 sensors (I can see them on the manifold, 1 has a single wire while the other has a 2-wire connector. I'm going to change out that 2-wire sensor since the one I have in there, I got from the Salvage Yard too. I will follow-up with you on when I put that part on and test it. Thank you again for your technical expertise.
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