Join Date: Aug 2004
Location: Indianapolis, Indiana
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is the roller button by the center vents moved to the red, this is what controls the heater valve, if it's to the cold no coolant will flow through your heater core and you will get no heat. If it is, you might have a clog in your heater core that is preventing coolant from flowing through it, that is if all those other parts are functioning correctly FOR SURE.
as for agtur2001 are you properly filling and bleeding the cooling system, just pouring in coolant and going isn't enough, you need to fill overflow tank, unscrew the bleed screw, make sure your heater controls are set to full hot, turn on the engine and rev it to 2500k or so and watch as coolant comes out of the bleed screw you want to keep adding and revving until you see no bubbles come out of the bleed screw then screw the screw back in and drive around, once the engine has cooled makes sure your overflow tank is filled to the cold/kalt level, low coolant messages and no heat is not normal and not something you should have to live with, trust me I did this and ultimately it was one of the main reasons I got rid of my car, If you are not bleeding the system right you could have air trapped in your heater core if you don't have coolant properly flowing through it, you will have no heat despite the other components working properly.
Hopes this helps if you guys have any other questions concerns or if you still have a problem let me know. I battled the issue of no heat and low coolant for two years.
1990 Mazda Miata