I would check the hoses leading into your radiator, and also the overflow for antifreeze. If that is not the problem, it could be your heater core. Your heater core might be leaking, you might have a hose leaking
On the 4 cylinder engine it is located in the water neck where the hose from the radiator goes on the passenger side of the engine.
It's buried underneath the dash, and, the question you ask is too involved for a proper answer. You need to go to a car parts store, and get a repair manual for your car. They cost about $16.00 Or, go to a Public Library.
I'm not sure about the location for your 300SD, but I have a 1979 450 SLC and the fuse box is located underneath the dash on the passenger's side -- to the right of where the passenger would place his feet. The fuse box diagram should be glued to the back of the door that opens to the fuse box.
disconnect neg batt cable, remove wires from starter, remove 2 mounting bolts top and bottom located where engine meets transmission on passenger side of motor. lift out starter... install in reverse order
If the heater has a sweet smell it could be that the heater core is leaking engine coolant. When the leak gets worse you will have a wet floor on the passenger side and the windshield will fog up when you turn on the defroster.
Thermostat is located on the passenger side of the engine. If you look where the two hoses are going from the radiator and the resiviour this part comes out and the thermostat is located underneath.
Antifreeze will be leaking in the floorboard on the passenger side, there will be a smell of antifreeze through the vents.
it is located on the passenger side underneath the seat
Could be timing cover gasket or head gasket.
hater core is bad
The engine coolant reservoir is in the engine compartment , on the passenger side , about the middle ( 50 / 50 mix of antifreeze and preferably distilled water , do not exceed 60 % antifreeze )
The thermostat is located on the passenger side of the engine, behind the timing belt.
Sounds like the thermostat is stuck. It is supposed to open when the engine heats up to keep the engine cool. The same antifreeze fluid is used to heat the inside of the car. If the thermostat is stuck in the closed position, the fluid cannot flow through the engine (thus cooling it) and through the heat exchanger to heat the passenger cab. Sounds like the thermostat is stuck. It is supposed to open when the engine heats up to keep the engine cool. The same antifreeze fluid is used to heat the inside of the car. If the thermostat is stuck in the closed position, the fluid cannot flow through the engine (thus cooling it) and through the heat exchanger to heat the passenger cab. Sound like a coolant leak.
Underneath the passenger seat.
Underneath the passenger seat
Leaking heater core.
You will need to replace the heater core.