Wheres that burning smell coming from when the heat is on?

recently iv been getting a strange smell when the heat is on in my truck. The smell mostly disappears when i start driving. Iv noticed that this is also the case when its in recycle. Any ideas? Iv also recently changed the ac condensor line as the old one was worn down by my bumper about 3 months ago.

 

Check the heater blower resistor connector in passenger foot well under the dash above the top of the carpet. They are known to get hot.

 

Good idea, iv been thinking that it has been coming from around there. Il check tonight.

 

Cabin air filter?

 

Nah i checked that when i first started to smell it.

 

Found out it was oil leaking through my valve cover gasket onto the exhaust manifold. Easy fix.