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Re: HEATER ISN'T BLOWING HOT AIR
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.
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heater core cloged, get car hot check heaterhose going into heatercore should be two inch thick hoses going into the heatercore, underhood against firewall pasenger side, after hot while running heater on, chech to see if both hoses r hot, if one is cold,that means there is a restriction in the heatercore, sometimes on older cars there is a external valve run by a vaccume hose, or cable, thats fixed in with the heater hoses , sometimes this valve jams and can be manually switched.
If it does, then check the operation of the valve, situated on the side of the heater matrix. The heater matrix is in the centre of the vehicle, under the dash. Roughly behind where most car stereos are situated. You'll have to remove any black, plastic shrouds to get to it. Work the hot/cold setting and check the valve for movement. If it is a motor actuated valve and in the even the valve doesn't move, then also check power to the motor. If you have no power to the motor, or if the cable operated valve isn't moving then check the switch mechanism or wire/wiring.
Hello! There isn't a sensor that would disallow heated water to circulate through the heater core...If the temperature gauge rises to normal...And the upper radiator hose is hot along with the lower hose ...I can conclude water is circulating through the block...Question then becomes; Is it circulating through the heater core? And the answer to that is, I don't think so...With the heater control turned on high feel the outlet heater core hose (facing engine it's the one on the left) if it feels cold or not as hot as the inlet then one of two items are at fault...#1...The Plenum assembly, which the heater core sets in has an open vacuum line...#2...The heat control valve cable or the valve itself is not opening...See picture of valve below...It is on the firewall...Let me know if heat is passing through the heater core...If hot water isn't passing through the core and the valve is opening than the core itself is blocked...send a comment...Guru...Saailer
Your problem can be caused by a bad thermostat, bad heater control valve, a heater door that's not opening or a clogged heater core. If the thermostat is good, check your heater hoses when the heat is on. Both should be hot; if one isn't there is a vacuum operated device inline with one of the hoses (heater control valve) make sure the vacuum line is connected to it. Sometimes you can manually force the valve to move; if you can do it and see if the 2 hoses get hot as a result. If they do, change the valve. The heater door is inside the vehicle and it too is usually vacuum controlled and often somewhat involved to service. I'm not sure of the exact configuration of your heater core but they too can become very involved to replace. More than likely the heater core isn't clogged and there's a very good chance you just have a sticking heater control valve.
Check the 'heater control valve,' which is attached to the heater hose line under the hood. If it is malfunctioning, it will prevent hot coolant from reaching the heater core, with the result being no heat. This is a $30 part, usually not too tough to get at, although I've never changed one on a Lincoln.
There should be a heater control valve located under the hood in a hose. One hose goes into the firewall which flows through the heater core inside the rear of the dash and another hose coming out and back to the engine. It is probably a bad control valve or maybe the cable is stuck which opens and closes it when you move the knob on the dash. Have someone inside the car move the lever from hot to cold and see if the cable to the heater control valve moves. The rest depends on how handy you are. Should be an easy repair for your local shop.
check for a vacuum operated heater valve located on the engine side of the firewall. This black plastic valve has a vacuum line to it as well as hot water inlet hose from the cylinder head and a heater by pass hose. The vacuum line may be off, but even if you have good vacuum to the valve, the internal diaphragm may be torn--so no operation of the valve and no heated coolant to the heater core. I you have a vacuum test tool (a small vacuum pump with a gage) you can test and see if the valve will hold vacuum. If not, the diaphragm is damaged and you will have to replace the valve.