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I would start by checking your fuse box. It will typically be located somewhere under your dashboard, or under the hood. if they stopped working at the same time its probably electrical (fuse, short, etc) if it wasn't the same time it could be unrelated causes. Possibly the thermostat for your heater.
Check fuse if the blower is not working. If it is then replace your heater core. if its not then replace your fan switch.
It sounds like you have a bad heater core. I would recommend replacing it.
Only the fan is working, there is no gas burning (gas heater) or the electric heating element is not working(electric heater)Answeris it electric gas or oil Its gas.
There could be multiple reasons why a heater would stop working in a truck. There could be low coolant or a bad fuse to make a heater stop working in a truck. The best way to find out the reason is to take it to a certified auto mechanic.
Someone turned up the thermostat, or the thermostat has failed. The thermostat tells the heater what temp to keep the water at.
Could be low on freon,
The blower may simply have burned out. If the blower is out then the heater probably still works.
The heater would not be working on a 1990 Dodge Grand Caravan if the heater core is damaged or blocked. Hot coolant from the engine must flow through the core to allow hot air to pass into the cabin.
There are a couple of reasons why a 1999 Oldsmobile Alero ac heater to stop working. The heater coil may need to be replaced or the HVAC blower motor may need to be replaced.
You have a bad blower resister..............
The water people turned it off incase of leaks