You probably have a bad thermostat.
When a head gasket blows, it most often causes a lose of coolant either in the exhaust or the oil. When the coolant drops, there is not enough to circulate through the heater core. The engine may over heat but no heat will come out of the heater because there is no coolant in it.
It usually drops and when u drop a glass it smashes and when a bomb drops it explodes or it has a timer on it and when it is finished "BAM!'' your dead.
Engine bounce is a phenomenon where the engine speed rises rapidly and then drops back down while the vehicle is idling. This can be caused by issues with the fuel system, ignition system, or engine timing. It can lead to rough idling and poor engine performance.
sounds like the alternator is going bad.
ripples
you stand straight with your hands beside you bodies until the umpire blows their whistle and drops the ball.
Check to see if the coolant level is low. If you have a leak in the system and the level drops low enough your heater can't do it's thing.
Low coolant, check when engine is cold.
You could very well have a blown head gasket. I would advise getting it to your dealer and have it checked asap.
The low air pressure switch on a Freightliner truck is typically located near the air compressor or the air dryer assembly. It is mounted on the air system's plumbing and is designed to monitor the air pressure in the system. When the pressure drops below a certain threshold, it activates warning systems to alert the driver. Always consult the specific vehicle's service manual for precise location and instructions.
A typical diesel engine only burns a small amount of fuel when idling (think 1 gallon an hour). BY leaving the bus idling the driver is avoiding any issues associated with having the bus not restart if they shut it off (Dead Batteries, Gelled Fuel). This is especially true in colder climates when the temperature drops.
An electric heater stays at a constant temperature because it has a thermostat that regulates the power supply to maintain a consistent heat output. When the temperature drops below the set point, the thermostat signals the heater to turn on and when it reaches the desired temperature, it turns off to prevent overheating.