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It's really a pain to open them up but if your feeling up to it, it sounds like the magnatron has vibrated loose and probably disconnected a wire. Disassemble and take a pic if u need help. It's pretty straight forward once inside
1) Check your water pump is working OK and 2) You may have an airlock in the system. Take the expansion or header tank cap off, set your heater control for hot and exterior air. Start the car and run it till warm. With luck you'll run any air locks out of the system. While warming up, and being very, very careful, try squeezing the main radiator in and out tubes (The fattest) this may also move any air locks on. BUT BE CAREFUL, STAY AWAY FROM AND FANS AND PULLEYS. IF NOT SURE, DON'T DO IT OR STOP THE ENGINE FIRST.
With luck, you should soon start to feel warm air coming from the vents.
You have a control board on your furnace, there is a 3 amp fuse there, that 3 amp fuse needs to be replaced. You most likely touched a wire even by accident and blew the fuse. You will have to remove the door \panels to get at it. It looks like a normal car fuse
Potential easy solution; check whether there is a vacuum operated valve in the heater supply or return lines. My old v8 '84? Malibu had one. It kept coolant from circulating through the heater until the motor warmed up; helps warm the engine quicker; BUT it was stuck closed and I had no heat. Rather than purchase a new one or mess wqith the vacuum lines, my solution was to use a piece of wire (nylon zip tie might work also) to hold the thing in the open position. So the motor takes a minute longer to warm up. Else might be air embolism in the line, which could indicate combustion leak or insufficient purging of air from the system after you changed the t-stat. Good luck.
How hot this gets is often regulated by the engines ability to properly heat up. This is controlled by the engine thermostat. Alot of times, people who have an overheating problem simply remove the thermostate without replacing it. This does not allow the engine to heat up properly (it actually is running too cold) thus the water coolant does not heat us. result, barely warm air through cabin heater.