There a a couple of possibilities
1. The thermostat is stuck open. This can usually be veried by looking at the temp gauge. If it is not about half when after the engine has had enough time to fully warm up than I would suspect a bad thermostat.
2. the coolant level is too low. The highest point in the cooling system is the heater core. If the coolant level falls to low the heater core will not get enough hot coolant to function properly.
3, the heater core is plugged. Proper cooling system maintenance will remove much of the debris that ends up in the cooling system. If this service has been neglected this debris will settle in the heater core. Over time it will build up to the point that hot coolant can not flow through the entire heater core resulting in less than adequate or no heat.
4. The last possibility (and the least likely) is that you have a head gasket failure. The air that gets pushed into the cooling system will cause an air pocket in the heater core restricting the coolant from entering.
I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa
SOURCE: 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.
SOURCE: can not turn on my heat..ford explorer
you may have abad hot /cold blend door acuator.its bolted to air box. also make sure both heater hoses going to heater core are hot,if only one is hot and the other is luke warm or cold then you may have a clogged heater core,remove hoses (@ core) and flush with water hose go both ways a couple of times. good luck hope this helps.
SOURCE: 1998 Ford Explorer: No heat. Checked everything
take out the glove box, you will see a white box about 3 inchs square with wires pulged into it, this is the diverter control,take the screws out, and remove it, then see if you cand move the diverter by hand too get heat, if you can then you need too replace the control or just lock the diverter in the heat position, i had this same problem last week in a 98 explorer and liked too never found it , ive got heat now!!!
Testimonial: "yay! I finally have heat! Thank you so much for your help. "
SOURCE: no heat 1998 ford explorer change the doorblend
Hello prieto725
Check the vacum supply to the heater control valve, under the hood on the right side in line with the
input heater hose. Have a helper move the temperature control on the dash while you watch to see
if the control valve is working properly. Also check the heater hoses they should be the same temp.
check the input hose between the ctrl. valve and firewall, if the input is hot and the output is not,
the heater core may be pluged. Hope this helps.
SOURCE: Hi i have a 1998 ford explorer it over heats when
maybe a timing problem or a thermostat problem
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