Heater Not Working Properly

The thermostat was replaced this Feb, the temp at full operation sits at half...right between hot and cold or straight up...

thats right where it should be. make sure no air then recheck hoses in and out of heater core and feel if they are hot. you have basically covered all possible problems. unless there is no flow through the inlet hose or a blocked return which is unlikely and im not exactly sure the routing of that system. maybe you could try removing hose from heater core and run engine and see if there is good flow through the inlet hose to heater core and then you could try blowing compressed air into the return lightly and see if flow comes out of heater core inlet, when engine is off.

Here is the thing... I was getting some heat and now its cold again...I took the arm from the motor so the flap is in place...do you think the stat is stuck open? The tep gure gets to normal tep position

its possible. i would definitely double check and check passages when thermostat is out to make sure a old gasket is not blocking a water passage.

I have the same problem with my 1996 Audi a4. I have also replaced the core, thermastat, waterpump, checked all the heater/ac doors. I get heat through the defrost vent but not the front vents and it is only warm at high RPM. You are not alone...

The windscreen wipers, heating and the indicators have stopped working.

Check fuses. Check relays. See if power is getting to the wiper motor, turn signal switch, and fan switch.

Ignition switch or load reduction relay.

Thomas