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Try checking the antifreeze level, make sure the Hose to the Heater core isn't kinked and the cable valve is open. Then I would install a Flush kit and change the Thermostatand antifreeze after flushing.
It sounds as though your heater core is stopped up, have someone intelligent to drain your radiator and catch the antifreeze because of animals drinking it, it will kill the animal, then flush the radiator & heater core with a flush designed to cleanse the system, follow directions from flush manufacturer, then put the correct amount of antifreeze in your radiator. Wal-Mart or any parts place will have this in different brands. This may help, it did on my 1998 mercury Mystique.i hope this helps you P.s. Just follow directions on the flush container & this can be done by the do-it yourselfer Make sure you allow the engine to cool before pouring the new antifreeze into the radiator, could burst your engine block.
Mine did the same thing, except here it is very cold. I took it to a radiator specialist, and what he did was nothing short of genius. First he disconnected the hoses to the rad, heater core and engine, and then flushed each seperately. Then he reassembled it all, put in fresh antifreeze (50/50 mix) and restricted the crossover at the heater core. Now, in -20 celsius, it's so hot in the car I turn the heat almost off. I am not kidding. This is the only way to go as the cooling system gets plugged from short haul driving, sediments in the cooling system, etc. Cost me about $150.00. I am very mechanically adept, but I went and had a professional do it. Best choice.
With a COLD engine, open up the radiator cap to see if you have enough coolant. If you are low, it may still be good enough to cool the motor, but will only be able to circulate coolant through the heater circuit with high revs.
Do you have a temperature gauge or just a light? If the motor is overheating, you must be just about out of coolant as well.
If you share the cold with me in Canada, you MAY have a frozen radiator/heater if the coolant antifreeze wasn't strong enough for the winter. In that case you if you get in and drive the car it WILL likely overheat since the liquid coolant is solid or slush and can't move through the radiator to cool.
OR... maybe a cable for the heat/cool control is disconnected or you have lost vacuum control for fancier models... did you ever hear a "shhhh' when you moved the heater controls.?
Let's hope it's just low antifreeze... if you add some, make sure you maintain about a 50/50 mixture of antifreeze/water.
Hope this helps...
/denis from Canada
It could be air locked. Feel both your heater hoses, and, with the engine running, loosen the one that's cold, if there is one. If that doesn't help, it is probably your heat control valve that is malfunctioning.
If no coolant flowing through the heater core then ther is no heat. There are 2 possible root causes needed to check out:
1- THE VALVE TO CONTROL THE COOLANT FLOWING TO THE HEATER CORE IS NOT OPENING AS DESIRED.
2- THE HEATER CORE GOT CLOGGED UP AND NEED TO BE FLUSHED.
hi from uk when engine temp is hot and heat set on max openhood and physically feel both heater hoses for temps ? if one is hot/warm and other cool ? then coolant is not circulating thro the heater matrix(radiator) as you have renewed most parts suspect without success? may i suggest your actual circulation thro the matrix is most likely to be the heater coolant valve which is elec operated as you turn the heat selector in dash both heater hoses connect to this for open/close to matrix of coolant so if valve is failed it is not servicable ? and not to difficult to locate if you follow h/hoses to heater ensure there is power to the actual valve b4 you consider replacing valve easy diy and not too expensive ? hope this helps you ?