Smell coolant when heater is turn on...

This may be due to a bad heater core or dirty core with a plugged water drain, first see if the a/c works. turn it on and see if the air gets cold and if the ac compressor works.

The way the defrost works to keep windows from fogging up is that when the front defroster is tuned on the ac should also be on, on most cars when you go to defrost it will turn ac on automatic. the system then uses hot and cold air to remove the moisture in the air to avoid window fogging. if your a/c is not working then that may cause window to fog, but if you are also getting a smell then the drain that lets out condensation may be plugged and then water builds up and also mold from always being wet and when heat is on you smell that.


i want you to run the defrost and when windows fog up wipe window with hand and see if it is greasy . if it feels oily then you may have a bad heater core, the core leaks coolant out and steam and causing windows to fog up with a flim of grease.

Not familiar with Saab at all, but on every other car made, if you smell coolant inside the car and a fog covers the windows, the heater core needs to be replaced. Depending on the design of the heater box that contains your blower motor and heater core, leaking coolant may be destroying your blower motor, and causing the noises and metal smell.

YOUR HEATER CORE IS GOING BAD. SOONHEATER WILL NOT WORK AT ALL. PLEASE REMEMBER ANTIFREEZE CAN BE TOXIC.

no heat is probably low coolant or bad thermostat,although you have fog and smell ! the heating and cooling systems are closed systems the only way the windows fog is the coolant is hot and steams inside the car due to some leak inside the heater core box. as well as the smell being present. Now it is possible that a little leak has occured where the coolant supply or return line connects to the heater core and is running into the car which is running onto the core and creating steam and smell. hopefully it is a easy clamp tighten fix for you.

Your heater core either leaks or a hose is leaking,inside on the carpet or behind it

the heater core could be leaking that explains the fog but i would have the water pump checked

your heater coor is clogged up

You have a coolant leak most likely in the heater core. Try disconnecting your heater hoses and coupling them together, then running the engine to see if the leak goes away. If it does, I would have the heater core replaced.

The early sign of a heater core leak is the smell of coolant, the reason is that only vapor is leaking now, it will gradually get worse in most cases and coolant will start comming out the heater box condensation drain.