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Hi, my 1998 Ford Expedition temperature gauge shoots all the way up when you start the car if though it's still cold and I suspected it was a short, I am trying to locate the temperature relay first or a fuse so I need to know which one is the relay. Thanks. J.Saadi

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: Fuel guage and Temperature guage

My 06 ranger is a 4 cyl model and I also am looking for a wiring diagram. Have you checked bulkhead connectors on the firewall for security, corrosion etc.? If you find the schematic on line please post the link. Good luck.
DaveBob55

Posted on Jun 15, 2008

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SOURCE: Problem with cold starting Ford 7.3L Diesel at > freezing temps

most likely the relay. its located to the left of the fuel filter( looking at the motor from the front). my experience is that they only last about 50,000 miles. the part costs about $20 at an navistar dealer. remove the cowl over the filter, disconnect the batteries(so you don't short the new relay out if you cross the polarity with a wrench) ,remove the four wires from the ceramic relay, un-fasten the relay from the base. reverse the process with the new relay. CAUTION; do not over-tighten the nuts on the wire studs, you could crack the ceramic relay.(iv'e done it) . hope this helps

Posted on Mar 18, 2009

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SOURCE: 1998 ford expedition wont start. theft like is

If you are reseting a factory alarm...lock and unlock the drivers door with the key. If you don't know the code look under the dash driver side in left corner there should be a black cover with a sticker with a code on it 6 numbers that is the factory code.

Posted on Oct 07, 2009

  • 564 Answers

SOURCE: temperature gauge reading 0

did u ck the right temp sensor,,did u send power to gauge to see if it works,,or ground it,,

Posted on Feb 01, 2010

hfmiles
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SOURCE: where is the powerlock relay located on a 1998

The Aux. Relay Box #4 is located in the rear driver side removable panel with the jack. The box holds the Door lock and unlock relays; The driver's door lock/unlock relay and the ACC. Lights relay.

Posted on Jan 10, 2011

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I have a 2003 Ford Expedition. It is showing overheating and then will shoot right back down. We've replace the thermostat but that doesn't seem to be the problem. doesnt appear to be overheating.


Bad gauge , maybe !

Temperature Gauge
The PCM receives the engine coolant temperature status through hardwired circuitry to the engine coolant temperature (ECT) sensor. The instrument cluster receives the engine coolant temperature data from the PCM through the SCP communication network. The instrument cluster microprocessor monitors the engine coolant temperature data received from the PCM and commands the temperature gauge indication with a corresponding movement of the pointer.

At the dealer we would hook up factory scan tool an see what the PCM is seeing for coolant temp . then go into data stream of instrument cluster an see if it is receiving the same data . , Your best bet , take it to a ford dealer . Before you start replacing parts that don't fix the problem .

Mar 26, 2017 | Ford Cars & Trucks

1 Answer

2002 ford expedition


Check for codes & diagnose the various issues
Repair Shop ---I assume-- if you have to ask

Jul 20, 2013 | Cars & Trucks

1 Answer

My 2001 Ford Expedition won't start when cold but i let it run awhile and kill it, it starts right up.


There is a "Cold start routine" that makes changes in the fuel and timing for Cold starts. The vehicle can have 2 sensors with one running the water gauge and the other operating the engine controls.

You probably do not have a working water sensor or the Brain is not making the adjustments. You would need to test the latter, but the water sensor is inexpensive to do trial and error. Just change the correct one.

Apr 07, 2013 | Ford Expedition Cars & Trucks

1 Answer

Temp gauge goes from normal to cold so does heat


maybe you are very low on coolant fluids

Mar 07, 2013 | 1998 Ford Expedition

1 Answer

My 2001 ford expedition won't keep runing when it's cold I have to keep my foot on the gas or it dies until the engine warms up. What is going on?


Your vehicle needs a signal from a Temperature sensor to activate the "Cold start routine". The cold start routine is a modern day version of a choke used in the old days. This process will make the engine speed up by enriching the fuel mix and resetting the engine timing.

The problem is that your engine is stuck in the normal "Lean" run position for better mileage and lower emissions. There can be 2 temperature sensors in each vehicle with only one dedicated to operating the engine controls. The other sensor would operate the dash gauge or light.

When the Temperature sensor is replaced, the system should work again. If it does not respond, there could be a connector problem in the PCM unit, but it is less likely.

The onboard diagnostics would generally monitor the PCM, but the Temperature sensor is usually an unmonitored device.

Please rate my info.

Jan 10, 2013 | 2000 Ford Expedition

1 Answer

My 1998 Ford Expidition heater starts our hot then gradually gets cold, what's wrong with it?


If your temp gauge goes up, then it is a head gasket problem, or intake gasket leak that makes it loose pressure.

Jan 13, 2011 | 1999 Ford Expedition

1 Answer

Even though my truck is not overheating, the temperature gauge will shoot up to hot and the oil light will come on. After a few minutes, the truck will not let me accelerate anymore. If I shut the truck...


Even though my truck is not overheating, the temperature gauge will shoot up to hot and the oil light will come on. After a few minutes, the truck will not let me accelerate anymore. If I shut the truck off, it will reset the oil light and the temp gauge and run fine for a while. But eventually, it will do the same thing again. Is it a sensor or computer problem

Aug 20, 2010 | 1998 Ford F150 Regular Cab

1 Answer

1998 ford expedition: engine ovr heat light comes on- soon after heater goes from hot air to cold. Pull over cycle key all lights go to normal soon after heater goes to working. replaced radiator- fan...


Have you tried replacing the overflow tank cap. These don't hold pressure as it should which will cause the temp to rise. EX: the cap rating is 15psi, and the cap has a defect which only allows the cap to hold 10-12psi. That water has to be pressurized by the cap for the water not to flow out. Also, does the temp gauge reach a high level or just the temp light comes on. This will give a better idea of the problem. If the gauge is normal but the light is on, sounds like a temperature switch is bad.

Jan 19, 2010 | 1998 Ford Expedition

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