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Re: need heater to work,its to cold out to try
If the blower works (and your problem is that the air isn't warming up even after the engine has been running a while), the first thing to check is that you have enough water in the engine cooling system.
If the blower isn't working, check the associated fuse first, then the speed control resistor.
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1st of all, you need to check your anti-freeze level. If its not full, the coolant cannot/will not flow throughout your heater core which the coolant flow through to heat your vehicle. If it is indeed up to the proper level? Than, yes I would look into the thremostat. It may not be opening up.
Are the radiator hoses from the engine to the firewall hot? If so, it's probably not the thermostat, it's probably either the heater core or the controls not allowing the heat to get in. Best advice I have (because I had to replace the heater core in my car last year) is to buy a Chilton repair manual for it. it walks you through everything. If it is a heater core, be prepared for a long job...
Replace the Thermostat and check operation.
You may also have to check and replace the Engine Coolant Temperature Sensor located on the backside of the Thermostat Housing.
Let me know if this helped, or if you have additional information or questions. Feel free to contact me on FixYa.com!
The car uses the same freon in the front as it does in the rear. If the rear a/c is working, you either have a plugged evaporator in the front unit, or perhaps a bad heater switch. Try switching the heater to hot and see if it blows even warmer air from the front vents. If so, the heater switch is working and then it sounds like a plugged evaporator or maybe a plugged orifice tube. That is a good place to start looking. Hope this helps.
THE BLEND DOOR THAT CONTROLS HOT TO COLD SWITCHING IS STICKING. THE CONTORL HEAD IS ELECTRIC AND MAY BE CAUSING THE PROBLEM. HEAT AND AC ARE 2 COMPLETELY DIFFERENT SYSTEMS EXCEPT FOR THE CONTROLLER UNDER YOUR RADIO. HEATER COIL IS REALLY A HEATER CORE WHICH IS A LITTLE RADIATOR INSIDE THE CAR BEHIND THE DASHBOARD.
As me and my stepdad just discovered, the Galant came with an added feature to help the AC use less energy, by placing a heater valve within the dashboard. After pulling about 10-12 screws and half the dashboard apart, we simply opened the valve permanently. Many cars out there work that way all the time. Now after changing those lousy clamps into actual hose clamps by the firewall, my wife enjoys cool air in the summer and heat the whole winter. Hope this helps, there is a site that will actually show you a video of putting dash back together, as author did not film the disassembly.