2015 Freightliner cascadia antifreeze smell

As I was checking my dd15 for any leaks I noticed there was two small hoses by the EGR and heater core they where leaking small amount of coolent so I bought new clamps and replaced it but before I replaced it I forgot to release pressure from reservoir so when I took the hose off but one gallon of antifreeze blown out all over the AC unit the firewall basically everywhere so I added about 1.5 gallon of antifreeze it smelled for a while outside the engine compartment then the smell went away no leak no antifreeze loss but what I noticed is when I turn heater on I get antifreeze smell for a while then goes away from the vents and wen I turn off the heat and turn it back on smell comes back what can this be no leaks from heater core if there would be leak from heater core I would smell all the time

 

Ok I'll try that and see if the smell goes away I'll post back