Most of the times the heater core gets clogged or corroded. inside the fire wall and the hoses run through the engine compartment and into the firewall. You can try disconnecting the top and bottom hoses and using a garden hose to flush out debris. Flush through top hole first then bottom cycle back and forth to break everything up and water comes out clear. Then hook the hoses back up. Also make sure that your radiator l with coolant at the proper level. The heat typically coming out warm then blowing cold is low coolant or clogged heater core but the gauge on the dash should only symbolize engine temp. If it stays on cold, you may also want to check your thermostat to ensure it functions and opens and closes as it should. All cheap fixes that can be done yourself.
What have you done so far? Sounds as if the thermostat is bad.
SOURCE: Adjust valve clearances 1987 toyota corolla
Im assuming its an 4AGE!?
http://www.ae92gts.com/ae92gts_valve_adj.html
And here one of my favorites...;)
http://www.billzilla.org/4agstock.htm
SOURCE: Toyota Corolla AC/heater fan only works intermittently
I had the same problem on my 2004 Corrolla and ultimately it only worked on high. The dealer charged me $45 diagnostic fee and almost immediately told me it was a part called the blower resister. They knew the answer right there and then but only realesed it when I agreed to pay the diagnostic. They charged me 179.00 to fix the AC and later I found out the part cost $8.95 and a novice could have replaced it themselves.
SOURCE: No heat/defrost 01 corolla
Sounds like you have air trapped in the heater core when you flushed the heater core. loosen the upper most heater core hose and run the engine untill coolant seeps out. Wait until the coolant has reached running temperature.
SOURCE: 2001 ford escort zx2 has
It is much more likely you are low on coolant or you have an air bubble trapped in the cooling system. You should bleed the cooling system to get any trapped air out and make sure it is full of coolant.
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I have replaced the thermostat, put a bottle of rust and sludge eater thru the radiator. Flushed the radiator. Checked fuses.
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