Why heater is not blowing hot

if you check the translucent coolant jug is it filled between "hot" and "Cold"??? what color is your coolant? brown?

tell me you did not use tap water...but a 50/50 ethylene glycol mix~

there is a "dip tube" inside the cap...if this one falls off you WILL overheat~

I believe yours has a cable operated diverter valve that opens the coolant to the heater core~ examine the function with one person activate and the other at the diverter to see if it is movin'~

The blend door on these cars is cable actuated - it's possible for the blend door to bind up and prevent the door from diverting hot air through the heating ducts.

Where is the blend door??

The blend door is built into the heater box... The dashboard needs to be removed to access it.

Omg!!!! Ok thanks

In this case the blend door can be checked from the passenger seat where there's an access panel so no need to pull the dashboard.