1998 Ford Explorer. The automatic heat settings don't seem to work. It just blows hot air and never adjusts to the temperature it is set at. Also having issues with door locks and windows. Cannot unlock doors from driver's side power lock but can from the passenger door. Cannot roll windows down except from the driver's door. All fuses are good and the window lock is not activated.
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Re: 1998 Ford Explorer. Heating / Air Cond.
You are deffently haveing some electrical issues. These usually result from bad ground. The fact you are experiencing so many at the same time make me want to ask the following question. How long have you owned this vehicle, and was it a swimmer (flood damaged)? If not, I believe I would start by checking under the hood on the drivers side where the relays are located. Start by making sure all wire connectors are tight. If so, then check the relays. You may want to pull them out, one at a time so you don't confuse where they go. Sometimes just taking them out and putting them back in is enough to make a better connection, some times that is, Try that for now I'll write more later when I have more time and I find out more info from you about your vehicle.
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my idea would be to take it to a shop which does only A/C work and ask them to tell me what is wrong and how much to fix it. 10 years is the design life, and most of your components and the hoses that connect them are either at failure or close to it. so find out what is wrong and figure out how much you are willing to spend to fix it. do not simply recharge the system on a car that old until you find out if it has leaks.
Check all the vacuum hoses connected to the vacuum motors to see if they are disconnected or damaged. A fairly common one is the vacuum hose leading from the engine to the heater controls on the dash. It gets roasted from engine heat. G/L
I know from experience that if the coolant is to low ( not just the freon levels in the compresor but the antifreeze/coolant level as well) the AC system will not cool and will blow hot. Check the coolant Antifreeze and freon levels, even with the Coolant being a little low my 1998 Ford E150 Van will blow hot. After you have ruled out of these possibilities and the chance it is the thermostat most likely the problem is what Ford calls the "Flap" it controls the air flow through the vent system when you switch from Heat to AC. When the Flap is working it closes off one systems air flow so as to not interfere with the current climate selection.
Could be a couple of things. The first thing that I would check would be the coolant level in the radiator, if that is low it can cause the heater not to blow hot air. The second thing I would find out is if the control to change from cold to hot is actually working? ( if it is a manual slider then the cable might have come off of the control behind the dash...if it is digital then there may be a wire off?) The third thing it might be is that your Heater Core went bad and will need to replaced. As I said above, I would check the coolant level first and go from there. Hope it helps!