My 2010 Ford Explorer experienced a radiator leak between the radiator and the plastic tank on the top, so I replaced that, we were still not experiencing any heat while driving it. I watched a couple of videos on how to "burp" the system, to no avail.
Next I replaced the thermostat, and "burped" it again, still no heat, so I drained and flushed the system yet again and still no heat. What else is there to check? I have the Haynes manual and did the flush and fill the way the book said and still have no heat I am about to lose my mind.
The blend doors sound like they are opening. They are not clicking like they are broken.
The heater is on full the entire time, I have not rotated the dial since I started this.
I unplugged one of the hoses on the heater core and blew into it, the hose was bone dry and I blew into the end of the hose and fluid came out of the cabin side metal tube. I also plugged a water hose into the tube and ran water through it to make sure it wasn't clogged, it is not. Front and rear heater cores.
Here is everything thing I have done from the start:
Drain and flush and re-service.
Checked for leaks out of the water pump weep hole (none) and operation of pump, the upper hose gets hot and I feel water go through it when the thermostat opens.
Check the radiator cap for pressure, it opens at 20psi and hold between 17-19psi. Replaced radiator cap anyway.
Removed supply hose and ran coolant to help purge trapped air.
Ran water through the supply and return hoses on the heater core. On the front and rear.
Check operation of heater control valve, works.
Turned vehicle on while watching the exhaust pipe, a small amount of water on initial start up in the morning but no smoke.
Problems still occurring:
Drive vehicle it over heats but returns to normal at idle I also get the coolant light that extinguishes when the car returns to idle. Even though it says its overheating the car has not pushed coolant into the expansion tank.
The car will not take any more coolant, and only overheats after the fan comes on. And still no heat.
My background is no car experience, I am a helicopter mechanic
and if this was an AH64 I would be done by now. SO please take it easy on a rookie shade tree mechanic.
Should add, 4.0L engine, no oil in water after flush and the engine oil looks like engine oil not milky. Next step was a water pump someone please talk me out of that.