There's a sensor in the bottom of the coolant expansion tank.
check the multifunction (turn signal) switch
Just the amplitude change, while the frequency and phase still remain
A radiator cap would not cause a leak! However, if the radiator cap is holding pressure, other weak parts could signal issues in need of attention.
Rain.
hourly time signal is causes your watch to beep every hour on the hour.
open your hood. take off your right side headlight bezel. remove headlight and park/turn signal light. your radiator pepcock will be in plain sight. remove your radiator cap and open your radiator pepcock to drain.
your brain gives off a signal that causes your eye to drip. then the same signal goes to your nose and causes it's fluids to run.
The engine computer uses the signal from the coolant temperature sensor to decide when to activate the radiator fan relay.
an electrical signal up to the airbag and it deploys
the signal cord
There is no signal in the area you are in.
A relay in the fusebox near the battery, its receives a signal from the ECU when to turn on