Hi my car only gets lukewarm heat if it is cold out. If it is warm out 30F and above then my heat gets hotter. I checked my heater hoses and only the inlet is hot the outlet is cold. When I give the car gas the heat gets hotter and my lights brighten. I also checked my alternator and when to car is off it has 12.5 V on the alternator itself. When the car is running the battery gets 13.3 V which is low. Would the alternator have to do with my heat.

 

Some one please reply

 

No, Alternator produces current and has nothing to do your heat. It's either your heater core is semi-clogged, thermostat stuck some what open, or clogged passage in the heater hose.

If you do a reverse flush with a water hose on your heater core, it'll get hotter than it is now is what I was told from my cooling class.