When you changed the therm you let air into the system and it will usually cause a air bubble in the heater core you probally should try to burp the system there is usually a plug or a relief valve check with your dealer fro instructions on how to burp the air out of the system try that first befor4e trying to replace the heater core
Is your temperature gauge spiking at all. The lack of heat was my first sign that my head gasket was cracked. You likely have air trapped in your coolant line. Get a Lisle coolant funnel to help get it out. It's cheap and very easy to use. If you still continue to have heating issues with your car after getting the air out, take it to a garage and see if they can send the head gasket in to be inspected. If your head gasket is cracked, it's just going to get worse, causing your car to eventually have overheating problems.
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There is probably a clog in the heater core. Remove the heater hoses and use compressed air in short bursts to blow out the clog. This will be very messy. Reconnect the hoses, refill the coolant, and you should be set. If this does not work, you may have a faulty heater control in the dash.
Physically look in the radiator under the cap for coolant level, and check the valve in the cap for sticking. If air is present in the radiator it can't get out, and more coolant can't get in,(from the overflow). Either clean the cap or replace it and check that it is the CORRECT cap.
Radiator fins dirty, clean with a strong stream of water, not high pressure water.
Radiator clogged, have it boiled out, or replace.
Thermostat stuck open or shut, replace it.
Water pump worn out, can no longer move enough coolant, replace it.
Fan shroud broken or missing....
Electric Fan(s) not working, Check the fan, relay, fuse and engine temperature sensor's.
Belt driven fan, belt slipping, fan clutch is bad, fan blades have flattened out.
Air dam under front bumper is gone, loose, or broken. It actually has a purpose other than scraping on the driveway or curbs. It forces air up into and thru the condenser and radiator. If it
3
Inspect
Oil Pan Gasket - Performance
Ruptured, cracked or leaking radiator hose.
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Inspect
Radiator Cap
Worn or damaged radiator cap
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Inspect
Thermostat
Thermostat stuck closed
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Inspect
Fan Blade
Broken, missing, or defective fan blade(s).
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Inspect
Water Pump
Damaged, worn or leaking water pump.
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Inspect
Intake Manifold Plenum - Perform
Leaking water pump gasket.
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Inspect
Cooling Fan Control
Faulty cooling fan control or circuit.
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Inspect
Cooling Fan Switch - Radiator
Faulty radiator cooling fan switch or circuit.
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Inspect
Engine Temperature Sensor
Faulty engine temperature sensor or circuit.
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Inspect
Temperature Switch
Damaged or faulty temperature switch or temperature switch circuit.
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Inspect
Fan Clutch
Worn, loose or faulty fan clutch.
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Inspect
Ported Vacuum Switch
Damaged, leaking, or faulty ported vacuum switch.
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Inspect
Radiator
Obstructed radiator core or radiator cooling fins.
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Inspect
Head Gasket - Performance
Head gasket leaking coolant into cylinders here is a list of things to check Shaun
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