1998 Ford F-150 Questions

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Engine temp gauge say's truck is overheating but it is not hot doesn't happen until you get over 50 miles per hour
It runs fine, idles great, no power issues, no sounds. But its gone from maybe 14mpg to maybe 4-5 at best. Where should I start looking?
Its a half ton
My 1998 F150 5.4 V8 has 32,861 original miles. Battery light came on and won't go off. I have owned the truck for 6 months and have put 1000 miles on it since I got it. With engine off battery reads 12.3 volts, engine running battery reads 14.41 volts. Any feedback would be greatly appreciated.
Have 4 new oxy sensors plug wires plugs coil packs fuel filer. Lacks power runs a bit rough and should get better fuel milage (i think) mmechanic only replaced 3 oxy sensors and had 2 in wrong place. Fixed that so oxy sensor test finally complete
The fan motor has high speed only and I have no heat. How do I fix this problem.
90% of my air is COLD. Sometimes "warm" air will come through. What's the problem? Thank you for any feedback. Dave
I have a great truck (in my mind) but it needs a little help. What other year F-150's can I use parts from when fixing up my 1998 truck?
My wheels are completely rusted and I want to grab some off another truck (with their permission of course). Will any F-150 5 lug fit?
Also, can I swap my front bench seat with a bucket seat setup from another year F-150? If so, anyone know what year?
Can i just get one put on to pass emissions or have to have both and what will it cost me ? Please let me know!!
What might cause the overdrive light blink off and on constantly?
Radiator draining and cleaning raditator and engine block adding new anti
This is the first time this has happened. A couple times in the morning when starting the truck. It's like the battery is misfiring or something. Please help me.
What is the wiring on the firewall that connects the battery and alternator together called.
My battery light will not go off, what all could cause it to stay on.
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