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Re: 1999 Expedition won't start on really cold weather...
May need to replace battery have it tested first
first of all when was last tune up I mean fuel filter spark plugs but check this last if you had not had problems with the car over heating then check the coolant temp sensor
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it is at the rear end and looks look a guide rail with a plug I would first try to clean the connector and apply carbon conductive grease/NOT LITHIUM==OR DIELECTRIC THERE THE WRONG STUFF/and see if it responds it's only been there for 161/2 years braving winter after winter and its either still good or done from a lack of attention needed taking it out and really cleaning just might save some$$$$$
Old new beetle VW harness has contact resistance problems(vibration of wires) and needs to be recrimped the long wires(vibration can be stopped by silicone rubber anchoring). Cold weather make battery voltages low and needs recharged with handbrake on(headlamps off) 10 minutes warming engine up the whole winter.
This is information straight from the repair manual. 1. Defective spark plugs. the gap is to wide to get a nice spark to fire the engine. 2. Defective coolant temperature sensor. 3.Fuel not reaching the injectors, check filter, pump and fuel lines.
I would check one of the first 2. The temp sensor is where i would start.
During the winter, try using a higher octane gas. it fires off quicker which will start the car faster. Put about 1/2 tank of high octane, this will also clean the valves and injectors. I usually put a bottle of octane booster in my 2001 expedition 2x's a year. It has octane rating of 109. only one bottle per full tank. t sounds like it just needs a cleaning. If you can stand the cold weather, clean your throttle body which will make a big difference. Follow the top radiator hose from the radiator to it's ending point, that is your thermostat. Can be aggravating to change.
The alternator change is not that difficult. I would take the vehicle to an autoparts store and have them test the alternator output. Check the battery cables and make sure they are clear of corrosion and are tight. A parts store can also test the condition of the battery. Most parts stores will check the alternator output and battery for free. If you visit the autozone.com website, you can also register your vehicle information and have access to an online repair manual that will show the procedures for changing the alternator if it is necessary. Sorry for your trouble and I hope this helped. Best wishes.
You have a bad starter. A faulty starter will function when its cold but when it heats up, it takes more energy to get the starter to engage. Your problem is exhibiting the classic symptoms of a bad starter. I hope this solves your problem and the best of luck to you.