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When you say heater gauge do you mean your temp sensor indicator on the dashboard?
If that is only going 1/2 way it is alright as it means the coolant is circulating and cooling the engine properly. If you have not enough heat coming out from your heater then the problem can lay on the heater diverter or heater core.
I think you missed checking a couple of things more.
1.- Water Pump
2.- Temp. Sensor
3.- Radiator Fan
5.- Spark Plugs
6.- Spark Plug Wires
7.- Vacumm Leaks
8.- Fuel system (Pump pressure, injectors, leaks)
9.- Electrical System
10.- Check for even compression on all cilinders.
If it isn't over heating, then the coolant light means it's low on coolant, just add some to it, but don't fill it to the top.
As far as the blower, if the fuse is good , have the relay switch checked, or the blower motor it's self might be no good.
Sounds like you may have a partially plugged heater core. You could flush this out separately, from flushing radiator & engine block. Diconnect heater hoses going to your heater core and clamp off, so not to loose coolant from engine. Now hook up separate hose to one side of heater core pipe and flush out with typical garden hose. Repeat procedure on both heater core inlets. Reconnect original heater hoses and test difference. You may have to add an additional litre of antifreeze. If this don't work i suggest changing heater core. Good luck.........Ron.
Okay. warm up vehicle, get radiator hoses hot. Turn on heater, fan on low. Grip both rubber heater hoses close to the firewall, from the engine compartment side. They should be too hot to hold for long. If they are not hot, then you have a lack of coolant circulation to the heater hoses. If they are hot then access heater core, behind glove box area. Blend door which moves as you chose HOT or Cold, should be cable controlled, move the controls and be sure the door is actually moving. Keep me posted