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is there a chance that one of your heater hoses are clogged? or where they connect to the engine are clogged still? sounds like a clogged system. Cracked heater housing? Outside air bypassing the heater coil while driving?
disconnect the heat hoses going into fire wall , put hose into one with pressure and flush as it sounds like it could be bloked in the heater core,the other thing that could be the problem be the hot ,cold switch as it restricts the flow to makes the heater hoter or colder , it might need tlc or replacing as it is manaul not elec
Try flushing or blowing high pressure air through the heater core lines. its sludge build up and need to be flushed through heater core only. check antifreeze fluid level. only put in straight antifreeze, do not mix. most people do not know what mixture should be, so be safe and add straight, it will not hurt it, i run 100% straight antifreeze and never had a problem or worry about it ever freezing and cracking my block, heads or radiator cracking.
Even if there were no hydrocarbons detected I am almost positive you have a bad head gasket.Usually the back head on the number one cylinder.Almost all the ones I have done with this exact problem has been the rear head and the number 1 cylinder.Hair line crack between the cylinder and water jacket.I always replace both head gaskets.Hope this helps.Good luck.
Thermostat.? if you haven't? Do it first then try it. While the car is running for a while touch the heater hoses that lead to the firewall. if one is cold and one is hot? You have a blocked Heater core. Follow the hoses back to the engine. Unconnect them both. By using a garden hose flush out the heater core do one side and then reverse by doing the other hose Lots of junk will come out so be care ful. Mistake people make is "Flushing the system" That doesn't mean your flushing the heater core. Seeing that you have done everything else it could be the thermostat which you didn't list or the heater core being clogged. When you finished installing the thermostat and flushing the heater core out. Replenish the coolant system . If you have a bleeder on the thermostat housing? use it . loosen it and top off the fluid until you see fluid comeout of the bleeder. The system being air bound would cause no heat..
first check to see if your heater hoses are getting warm you may just have a bad thermostat, if you've had any recent work done to the cooling system you may have an airlock which does not allow any coolant too flow through the heater core. do you smell antifeeze ?
When u flushed the radiator, what did u find? Was the old coolant dirty, rusty, sediment in it? What u describe sounds like the core is plugged up w/ junk. This would be my 1st choice of the problem, especially if the coolant was rusty, cruddy, as described above. It wouldn't be an air pocket (after a couple of years). Some cars do have a valve that opens and closes to allow the hot coolant into the core for heat, or a flap door that opens to allow the fan to blow air thru the core for heat, but the fact that this started when u flushed the system leads me to believe it's a plugged up core. U could try to flush the system again, make sure the heat is on when u do, so u have circulation tthru the core to help flush it out. let me know how u make out. good luck!