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unlikely to be the coolant temperature sensor
more likely to be a failing electronic component like an ECM if EFI engine or an ignition control module failing for a component overheating internally
why I say this is because coolant temperatures take a long time to cool down but an electronic component that has no current flowing will cool quicker
have you changed the thermostat, check the rad cooling fan operation, checked coolant circulation, check for coolant leak, checked for head gasket problem, checked for a restriction in the cooling system. you don`t say what if anything you have done to eliminate a cause.
check the main earth wire near the battery. and one near the rear of the lights. unbolt them and clean the connectors up put some grease on them after. then check again. remember that when the earth wires come off the radio code will be needed to reset the the radio. be safe and take the battery off.
The first thing I'd check is the battery. Sometimes a battery may enough volts to run some of the electronics, but not enough cold cranking amps to start the car. When this happens, a simple voltage check won't help. I have a friend whose battery on his F150 had 12.0 volts but only 450 CCA, so it had issues. After checking the battery at the terminals, check for loose connection at the wires. Then, I'd go to the fuse panels and relays. Once all of that checks out fine, then I'd investigate the ignition switch and ignition relays. Of course, this is all on the assumption that you don't have an aftermarket alarm system. If you do, I'd start there. Many aftermarket alarms have a kill switch that disengages the battery or starter if the vehicle is being stolen. Good system....as long as it works. Good luck!
Your head light switch is the only other thing besides a relay if you have one in your vehicle. call the dealer ask for parts and ask them if they have a relay that runs your headlamps and tail lights if they do I would change it first if they say their is no realy replace your headlamp switch in the dash.
hi i presume you mean your indicaters won,t work since you changed your headlights firstly are the headlights the same as you took out and the wiring connectors the same and what do you mean the indicators don,t work example none of them they run to slow/quick its just the front ones just let me know and we will see if it can be put right yates210456