Okay, that is because there is a low coolant switch in the radiator to warn you when the coolant level is low.
Pnce you fill it, it may be air bound. Try removing the radiator cap and running the engine about 1200 rpm. Have someone watch the coolant level and keep it full. That will force the air out of the system. If the air is the issue, you will get heat.
Beyond that it could be either the heater core being clogged or the programmer not working correctly.
Wednesday, March 28th, 2018 AT 3:21 PM