1- Internal corrosion as someone failed to install a dielectric fitting to prevent electrolytic action of dissimular metals which is contrary to all model codes
2- Valve closed
3- A pipe ruptured taking all available pressure
the reason for water coming out from under the dash is that a hose could have broke or you have a problem with your heater. your heater works off of the water in the radaitor and since it gets hot from the motor well it serculates threw the heater and that's who your heater works
its the heater core. but its not clogged. its cracked
It could be coming from your heater core, may need to repair or replace it.
Check where this rusty water is coming from. There are many possible causes.
Signs of a failing water heater include insufficient hot water, strange noises coming from the unit, leaks or puddles around the water heater, and rusty or discolored water coming from the taps.
Only hot water may be coming out of the shower because there could be an issue with the water heater, such as a malfunction or a setting that needs adjustment. It is recommended to check the water heater and its settings to ensure that both hot and cold water are being properly supplied to the shower.
Signs that indicate a water heater is going out include: water not heating up properly, strange noises coming from the heater, leaks around the unit, and rust-colored water coming out of the taps.
If you notice a burning smell coming from your water heater, it is important to immediately turn off the power or gas supply to the water heater and contact a professional plumber or technician to inspect and repair the issue. Ignoring the smell could lead to a potential fire hazard or other safety risks.
If you see black stuff coming out of your hot water faucet, it could be a sign of mold or mildew in your water heater. It is important to address this issue promptly by contacting a professional plumber to inspect and clean your water heater to ensure safe and clean water supply.
It could possibly be the heater core Check your heatting and a/c
Check your heater hoses, that's where the water ciruclates into the heater from the water pump.
Symptoms of a bad water heater element include insufficient hot water, fluctuating water temperature, strange noises coming from the water heater, and discolored or foul-smelling water.