Burt Toast Smell while running heater

Need more information, like make, model,and where the smell is coming from. For instance, under the dash, or under the hood.

Your transmission is toast. Smell the fluid on your ****** dipstick. It will smell really burnt.

Check you cabin filter it is under hood on pass side near wiper blades
If the blower motor is running fine and no smell from there.

Doesnt sound good. Check your transmission fluid. If it is dark instead of pink or red, it is burnt. It will also smell burnt if you smell it. if its burnt the trans is probably toast. The only thing you can do is service the transmission by changing the filter and all of the fluid and see how it goes. Im not saying that this will work but this is the only thing you can do before officially pronouncing it DOA. Sorry..

The dimmer switch (which is the switch thhat makes the dash lights brighter or darker) for the dash lights on those cars give problems clip it out unplug it. normaly you can smell that the switch smell like burnt toast.

not necessarily, pull dipstick for trans out,is the fluid looking clean as a red color ? If it looks brown then maybe you should, Smell the fluid also ,does it smell clean or does it smell a little burnt like toast? if it smells burnt then you should flush and replace. I'm sure he is just trying to maintain the vehicle the best he knows how.

You can try and have the fluid and filter changed, but if the smell and discolor comes back, it's time to have the tranny rebuilt or replaced.

sounds like you have burnt tranny fluid and if the fluid is burnt so is the tranny and it is soon to give up
pull dip stick out of tranny and smell if it smells like burnt toast it means the trans is on it's way to the recyclers

new reostat unit

if its manual sounds like your clutch could be slipping does car smell of burt clutch?
check cluth adjustment
may need new clutch
do stall test with hand brake on, foot (heel-toe) on brake and accel pedal to about 2000rpm then let out clutch and car should stall if engine revs go down and engine still runs but you can rev causing slip and you will now smell what slipping burnt clutch is replace it.

if its auto check trans oil level and what does it look like red-good
darker red to black-bad often smells burnt also possibly new trans required.