You have identified the problem when you state that it only works in the high position. Your switch has variable speeds, it contains resistors that control the speed of the fan, for both AC/Heat. These resistors are burned out/or the connector to the resistors has become unplugged. The resistors are located in different locations so please get your auto manual to locate there position, and verify there operation.
Most cars have a simple blower motor resistor that provide the low-medium speeds. If it burns out the fan defaults to high speed - the most safe 'default'.
Walk into any auto parts and tell them your car only blows high and they'll immediately know what you need.
In most Ford vehicles this is a 10 minute, 2 screws procedure that most anyone can handle.
Yes, if stuck in the open position.
I would definently think that the cause of heat illness would be, I don't know,...HEAT!maybe. I would definently think that the cause of heat illness would be, I don't know,...HEAT!maybe.
a bad water pump could cause low heat. The heater uses the coolant from the pump to generate heat.
No.
heat
Normally, humans sweat copiously to reduce body heat. If sweating was prevented, then body heat would build up and cause a heat stroke - blinding headache and collapse.
heat
heat sink fine+laptop won't power on
your heat comes from your heater core which draws heat from your engine coolant so if you have no heat and the blower is still running then there is a coolant level problem as in none which then would cause the mottor to over heat and quick
For lubrication. Steel on steel would cause friction with would lead to heat which would cause seizing of parts and destroy the engine.
A thermostat
heat