Can I use the defroster if I have bypassed the heater core?

Uh.............he seems to be in Culver city?............. I'd say if you can stand the cold feet, the air blowing will probably be enough. I don't think it really frosts much down there, although I DO remember one time in San Diego.........

In my defence. Down here, come time to need a defroster. It better blow warm air