In order to access the fan you need to remove the wiper assembly, its underneath Check all of your fuses first! Relays too! Usually these cars have electrical problems first! Before buying any parts check all the fuses and relays it will save u time and $$$!! If not electrical, its located under the winshield wiper assembly behind the firewall. Its not hard to get to.
If the seat warmer on a 2004 Saturn Vue is not working it could be a problem with the heater element. This element can be found under the seat and will be easier to access from the rear of the seat.
If you have lost a sufficient amount of coolant this will stop the heater working because there will be no hot water in the heater rad.
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.
If the air conditioner in a Mitsubishi Legnum is not working, there could be a blown fuse. There could also be a loose cable, or a problem with the heater motor.
You have to be more specific. What is not working?
Check the thermostat, also there could be a heater core issue...
could be thermostat or heater fan if you can hear all the speeds on the blower motor working then it could be your thermostat but your heater core might be plugged as well
Could be low on freon,
That or the thermostat.
Could be your fuse, blower, heater core,loose ac belt, thermastatt or low coolant.
Your car could be low on antifreeze or your heater core could be clogged. With my car, it was Heater matrix clogged with radiator sealant. The workshop cleaned it and it's start working fine!
A blocked heater hose could cause a leak. A stopped up heater core could as well. Or the connector in the Windstar could be cracked.