beside the spare tire on top of a plate
You don't have to but it is a good opportunity to flush the system.
The coolant air bleed valve is located on the top of the thermostat bypass pipe/heater pipe assembly. Close the valve once a continuous stream of coolant is expelled from the valve.
When the thermostat is closed, the coolant circulates through the bypass hose from the water pump to the block.When the thermostat is closed, the coolant circulates through the bypass hose from the water pump to the block.
On a Dodge Neon, the coolant bypass hose is in the engine compartment. It is under the alternator and AC compressor. Both have to be removed before you will see the hose.
Heater coolant bypass pipe It would be the return hose for the heater.
That depends which "coolant" hoses you are referring to. Besides the two main coolant hoses to the radiator, there is a crossover pipe under the radiator, a bypass hose at the thermostat housing, two heater hose assemblies, and two small hoses to the throttle body.
Bypass
Some vehicle cooling systems will have a bleeder valve to get air out of coolant after adding new coolant and/or making repairs. There is no such thing as a bypass gasket, you have been misinformed, or correction has been poorly explained.
evap vacuum cut valve bypass valve
A bypass solenoid valve speeds up the warm up phase of an engine, and a faster temperature rise in the passenger compartment is achieved.
It is illegal to bypass the catalytic converter and besides your engine will not run correctly if you bypass or remove the converter.