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Re: I get all cold air / no heat when using defrost and...
It is possible that you may have an air lock in the system. You need to drain the rad again and remove the upper most heater hose from the heater core and raise the hose up high . Fill the rad until coolant comes out of the heater core pipe. Carefully reattach the heater hose. Fill the rad slowly allowing trapped air to escape.This may take a while. Once the rad is full put a catch basin on the floor under the rad filler neck.Start the car and let it run to operating temperature.Allow the expanding coolant fall into the basin.Once you see circulation in the rad you can slowly top the rad off.once you do this replace the rad cap and fill the reservoir bottle 3/4 ways to the top. Shut the car off and let it cool off filling the bottle as necessary.Hopefully this will cure your problem. Good luck :-)
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Coolant lines sometimes collapse which when the lines that hold coolant will suck together causing limited flow of coolant and not enough flow to engine so heater core yes but most likely no. in some vehicles you will see coolant on your passenger floor if it is a heater core I would say though its a weak coolant line that is sucking together look for one when the car is running
With blower on high and tempature to max heat check to see if you have good air flow in all mode selections (defrost, vent, floor etc.). If so and you still have no heat then check heater core hose going from engine to inside car to heater core with vehicle running and coolant tempature about half on guage. If both hoses are hot and coolant in radiator/overflow bottle is full then hot cold blend door is stuck in cold position. If coolant level is low you will get no heat, check coolant level first.
Yes . Your heater is actually not an Electrical Heater or a Separate Heating system . Actually if uses the same Radiator Line . When Radiator is heated up it is cooled down with radiator Fan and coolant . But when you use the heater function , this hot fluid is passed through a heating coil tube and blower fan is used to take that heat inside the car .
So I think now you understand , why you are not heated up in a short run . You really need to make the Engine + Radiator Warmer ( that is natuarlly happened when you run more) to get Warm air inside.
Please rate my answer fairly and Support me With Regards and Season's GreetingsDeepak Richard
If the heater coil was bad, it would be leaking radiator fluid... probably into your dash/floorboard (depending on where it is installed in your model car). There is a switch that diverts the hot radiator fluid through the heater coil when you want heat. There is also an air diverter valve that helps to mix the hot and cold air. The fluid valve is controlled by the A/C settings control. The one that you use to choose between heater/air conditioner/vent/ defrost. The air diverter is controlled by the temp mixing controller. The most simple explanation is that one of those valves or the controller of one of those valves is not working. If the hot water cant be diverted through the heater coil, the coil can't exchange the heat (warming the air). If the air diverter (hot/cold controller) cant move to add heat, then all you will feel is air from the vent side (from outside) or from the A/C cooling the air.
I would guess that its either a controller or one of the valves themselves. Odds are, it is a controller. That tends to be what malfunctions first.
Yes. Flushing the radiator would be a great first step. Check that your heater core feed and return hoses are not leaking or clogged. If it is still acting up, you may have a clogged or leaking heater core. Good Luck.
If your radiator is not clogged, your thermostat is working, and you have a new heater core, it sounds like when your mechanic was installing your heater core, that he possibly pulled a vacuum line loose or forgot to hook one back up. On most all late model vehicles, heater controls are vacuum operated. One line to move the selector flap from vent to floor to defrost, etc., and one line to move the heat flap from hot to cold. Most vehicle manufacturers changed from mechanical controls to vacuum operated controls to try to simpify the system and have less parts to have to replace. However the set-back with this is that when a vacuum line comes loose, it can be harder to locate your problem whereas a mechanical issue would obviously be right behind the controls inside the dash. If your problem is vacuum related, you can most likely assume that the problem will be somewhere under the dash, as that is where those particular vacuum lines should be routed, and also is what the mechanic had to disassemble when replacing your heater core.
Sounds like your heater core is bad. Have someone check out the heating system and possibly replace heater core.. that should take care of the fog problem also by enabling you to use the defrost... Good Luck!