The year, make and model info would be helpful.
The heating element probably burned out causing the open circuit. The element needs to be submerged in coolant completely, all the time that it is plugged in.
Brake Lights Don't WorkThere could be several causes for this problem, and without being able to see and troubleshoot the brake light wiring circuit no one can tell you the specific cause.Some of the possible causes include:Brake light switch is not adjusted properly.The fuse for that circuit is "blown" out.A wiring harness connector anywhere in that circuit has become unplugged, or loose.The ground wire or wires for that circuit have become disconnected, or the connection of the ground wires to the vehicle's grounded body sheet metal has been blocked by corrosion.A wire in the circuit has been cut, broken, or pulled loose.The brake light switch has become defective.There are probably a few other causes I have forgotten about.
No. In a parallel circuit, the resistance gets cut in half, so logically the bulbs would do the opposite and get brighter.
something on that circuit is shorted, the short needs to be repaired.
Those numbers are trouble codes stored in the PCM's memory and don't directly refer to parts. It's never a good idea to replace parts without first confirming the failure by means of the recommended diagnostic procedure. Code P0463 was set due to a high-voltage fault in the fuel-level sensor circuit. This may be caused by a bad sensor, the powertrain control module, or a short in the applicable circuit. The problem may be a defective fuel level sensor in the fuel tank.
A malfunction with the emission control system has been detected , scan for trouble codes to diagnose and repair
Trouble code P1470 means: Leakage Diagnostic Pump Control Circuit Electrical
Trouble code P1621 means: Engine control module engine immobilization input circuit malfunction
Trouble code P0446 means: Evaporative Emission System Vent Control Circuit
Trouble code P0446 means: Evaporative Emission System Vent Control Circuit
Trouble code P0740 means:Torque converter clutch circuit malfunction
Trouble code P0117 means:Engine coolant temperature circuit low input
Trouble code P0118 means:Engine coolant temperature circuit high input
Trouble code P0405 means:Exhaust gas recirculation sensor A circuit low
Trouble code P0741 means:Torque converter clutch circuit performance or stuck on
Throttle position or pedal position sensor/switch circuit, low input
Voltage causes current to flow in an electric circuit.