There are many different brands of sauna heaters available. Each sauna heater system has a fail safe temperature control. This control automatically shuts down the heating element when the temperature reaches between 150 - 190 degrees Fahrenheit.
Venus.
Venus
Temperature gauge may drop when heater turned on because additional coolant from heater core is introduced to cooling system - usually this coolant is cooler than what is currently circulating
Problem is that the heater core is the highest point in the cooling system. being a closed system any air that enters is trapped in the heater core. Result, no heat. Recommended repair is to back flush heater core, refill cooling system making sure all air is released from the heater core. Replacement of the radiator cap at the time of repair is recommended.
Keep the overflow tank filled to its FULL line. Find the highest point in the cooling system; open it very slightly. Sometimes the highest point is the radiator cap. Sometimes the highest point is at a hose clamp. Very rarely there is a bolt that is meant to be loosened to let air out of the cooling system (example 1995 Mustang) You will hear air coming out. Keep filling the overflow tank. Then re-tighten the part that you opened. Also you will want to have the car's heater on HIGHEST/HOTTEST while doing this because the heater is connected to the cooling system.
not unless you can find one using memory recall or you go into computerized system
Air in the water system.
In some autos, the AC compressor cuts in and out according to the temperature setpoint inside the car. Much like your heater/cooling system in a house, the system, when it reaches temperature, turns off.
System airbound? Coolant level? Temperature control cable?
Low coolant? Bad thermostat? Defective radiator cap? System air bound? Heater core plugged or restricted? Temperature control cable not adjusted properly?
Low coolant? Bad thermostat? System airbound? Water pump not circulating coolant? Temperature control cable not adjusted properly?
Planet with an atmosphere, Venus. Planet without an atmosphere, Mercury (on the day side).