Cooiling Fan and Heater

Background: I had no heat in my Jetta. but the temperature was running normal, right at 200
F. It did take what seemed like forever to warm up so I replaced my thermostat. Upon
replacing my thermostat i still had no heat, and I found a leak at my water outlet. I replaced the
"O" ring on the water outlet and also on the 2 sensors attached. I also had a oil leak at the
valve cover i repaired as well. Leaks solved. After refilling the fluid, I still had no heat. It
appeared my water pump was now not functioning (I am getting frustrated at this point). I
decided if i was going to replace my water pump I would also replace my timing belt i have
150K miles on the car so it was well overdue. After replacing all of thes items. I get it all
together and my Upper and lower hoses have sprung leaks, not bad leaks but leaks none the
less, and I still have no heat. since the leaks were very minor I did not believe they could be
causeing my heat to not work so the only thing left in my eyes was the dreaded heater core.
Reluctant, i replaced the heater core, and both the upper and the lower radiator hoses. Finally,
no leaks. I bleed the coolant system by idling the car with the cap of, slowing adding coolant
as needed. squeezing this hose and that until i ceased to see bubbles. The care was
operating at normal temperature.  I shut it off allowed it to cool, topped of the coolant again.
then took it for a spin around the block. NOW its overheating i assume because the coolant
fan isn't kicking on. I have run a res of wires from the battery to the fan and the fan works....I
am frustrated an I think I am overlooking the obvious can anyone help...ps I still have no
heat.also......