Burnt smell like a petroleum product.ford taurus 2001 3.0

possibly the bled door is stuck open so only the cold air from a/c works when on defrost vs closing to allow heat to cycle through the system as defrost runs through the a/c system

the over flow is the radiator cap so yes it would be fine

The tank is loosing coolant because there is a leak somewhere in the cooling system. I would have the system pressure tested to verify there is a leak. Sense there is a odor in the car and the coolant is low ..I would suspect the heater core is leaking. A pressure test will help locate the leak in the system.

sounds like electric door motor is bad in front of the heater core. door is'nt opening

if u can smell coolant burning when you try to turn on the heat, it would be the heater core. i would first check the coolant level and change the thermostat. if coolant is full and clean with a new thermostat u have a bad heater core

As a mechanic i am leaning towards a bad heater core. The core translates the heat from the cooling system into hot air for the cabin. Often times if the core is bad it leaks. check under the carpet, be keen on the smell of the antifreez and keep an eye out for foggy windows. Good luck and i hope i was able to shed some light on the situation.

~KAComstock

The smell of the antifreeze is coming from the drip in the water pump hitting the hot engine block and burning off.
The water pump bearing seal is bad and will Begin to get worse.
You can get away with this problem for a little while but you will continue to have the smell until you fix the water pump,
Hope this help give feedback and good luck FixYa

first check to see if your heater hoses are getting warm you may just have a bad thermostat, if you've had any recent work done to the cooling system you may have an airlock which does not allow any coolant too flow through the heater core. do you smell antifeeze ?

what you need to do is check that your relays are OK
in some cars you cannot see through the relay like a fuse
the only way to check if it is the relays is by replacing them
if this dose not work and you have a electronic climate control system your controm box may be burnt out this will need replacing

Check your coolant level. If the antifreeze is low the water pump may not be able to pump enough of the coolant through your heater core. When the car runs faster it is able to pump more of the warm antifreeze to the heater core.