Where is the heater core located on the s70 volvo, it smelling when turn on and smokes blows through the cabin

Its an antifreeze leak inside the cabin look for actuators or holes in any that carries vacuum or antifreeze also leaks on the floor something is leaking

this could be your heater core leaking antifreeze and the smoke may be steam

Are you getting coolant flow through the heater core? These cars have common problems with heater cores but they are easy to replace. IPD has a Video on U-Tube with step by step instructions. Also if you are in very cold weather have you checked your anti-freeze? I saw a Toyota last year freeze completely because of no anti-freeze. It took days to thaw out the heater core and they were lucky that the ice did not blow it apart. It took me hours of starting it and running up to a low temp and shutting it down to get it drivable.

the heater core has a hole in it leaking antifreeze in your heater box

If it smells sweet it is coolant and this is a sure sign your heater core is leaking. The only fix is to replace it.

suspect leaking heater core.check coolant level.

Your Heater Core is Bad= Coolant on Pass Floor
If A/C Does NOT blow Cold anymore the Evaperator Core is Leaking
First time I have seen them BOTH go Bad in 30 rs of Bein A Mech/Tech

you need a new heat core , it is located under the passenger side dash , you could try some silver seal before you replace it

Your heater core is leaking. The smell and smoke is from the coolant evaporation.

from he Popular Mechanics site if the smell in your car is like maple syrup:


(1) SMELLS LIKE: MAPLE SYRUP
WHEN: After the engine has warmed or possibly even after it's shut off for a few minutes.
THE CULPRIT: Coolant containing sweet-smelling (but toxic) ethylene glycol is leaking from somewhere. It could be coming from a radiator or heater hose, a failed intake manifold gasket or cylinder head. It might be coming from a leaky radiator cap or the radiator itself, especially if you smell it outside the car. A strong odor inside the passenger compartment probably means a bad heater core.