thermostat question

[sambudo]

Originally Posted by swamp rat

The 5/8 and 3/4 heater hoses will be as hot as your water temp, if a 190 thermostat then at least that hot probably even a bit hotter because the water that flows to the heater just went thru the engine. The Heater core will always have hot water flowing thru it.

The bottom lever controls a flap door inside the heater body, the door is what allows the air to flow across the heater core. If i remember correctly the air flows from the blower, then to a door which allows ether, none, all or part of the air to flow across the heater core, if it allows none then the air goes around a bypass and comes out ether the heat or defrost outlets depending on the position of that control. The door is moved depending how far you push the lever to the hot or cold side, and by varying the air across the heater core is what controls the temperature.

The temp gauge is very possibly the sending unit which is usually screwed into the head but not sure on your engine. The sending unit is not suppose to have Teflon tape on the pipe threads as the threads are the ground. Auto parts stores sell sensor safe thread sealer made for this application.

the lever that open and closes the flap is missing, also the hoses under the dash that would transfer the heat are also torn up, need replacing. Not sure if i have a heater switch, not sure how the heat turns on. regarding the sending unit, can i just replace this? Will water leak out if i remove this?