I think I need a heater core. Nothing blows out my vents and no heat even seeps out anymore. My blower motor is fine and my wiring harness is repaired. The climate control box does not slide all the way to heat either. My car has been overheating a lot more often these last couple days. I'm bout to give up and sell my car cause I'm always fixing it.

It's an 89 240sx currently with 191,000 miles on it.

 

u could have a stuck thermostate. take it out and let it run like that and see what happens.... if u get heat then put a knew one in and rock on.... if ur core is bad it usually leaks.

 

hmmmm.....sounds like an idea. thanks for the PM