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Possible trapped in system. Bleed system, should have two small screw bleeders, one in front of left valve cover on pipe behind water pump and the other on coolant pipe outlet as you follow upper rad. hose towards engine. Engine cool, remove rad cap, open both bleed screws and fill rad until coolant flows free out both bleed ports. close both bleed screws, rad cap off, start engine and let idle until upper hose is hot to touch , shut off, let it cool down for 20 minutes, top up rad and install cap. restart car ,drive and check.
Sometimes it's difficult, but be persistent. Look for a bleed valve on top of thermostat housing. If your car has one, open bleed valve and start filling the radiator. When only coolant comes out of bleed valve, close it and continue filling radiator till full. Leave cap off and start car, running it till the thermostat opens (upper radiator hose will be hot when thermostat opens-about 10 or 15 minutes). When you are sure the thermostat has opened and coolant is circulating, turn off the car and top off the radiator. Also fill the coolant reservoir tank (the overflow tank) to about halfway between the full cold mark and the full hot mark. Replace radiator cap, and you should be good.
If you know where the heater hoses are, lift the hood after car has warmed up I mean the engine running for at least five minutes, feel the heater hoses, if they are warm or hot and still no heat from the heater, you have an in line proiblem. if hoses remain cold, replace the thermostat with a winter thermostat.
have you checked your radiator fluid?...is it full?..if not, fill it, and see if that makes any difference.
if it is full you may have a thermostat that is stuck..
normally your thermostat will stay shut when u 1st start your engine. 1 of your rad hoses will be hot, while the other will stay cool / cold.
untill the thermostat opens, then both hoses will be hot.
watch your hands/arms near the fan.
your thermostat could be stuck completely open, completly closed, or even part way open...but ..it is a cheap part to change.
let me know if this helps you at all.
follow your top radiator hose to top of the engine, where it hooks up with a hose clamp. under that metal housing is your thermostat! usually 2 or 3 bolts you remove , then lift off the metal housing and take out your old thermostat and remove the old gasket with a razor blade.. install your new thermostat and gasket and away you go!! richie