In order, the most common cause of failure on the blowers is failure of the brushes on the motor itself. The motor is completely open to the elements as air comes in (ie, no cabin filter) and can get water and rust. Check the fuses. If both have failed simultainiously, odds are that the left side one is dead and is causing the right one to fail as well (the left sends the signal to the right, the incoming air temperature sensor is in the left side one, making it the "primary" box). There are several relays in each blower box that can fail from water damage, and a capacitator in the bottom of the blowers that sometimes fails. The module in the center console rarely fails, but can fail to send signal to the "piano" computer (it looks like a grand piano, its the climate control computer) located on the left side of the box containing the evaporator and heater matrix. The connections on the piano computer can fail, and the computer itself can fail. Rarely as well, the feed wires at the fuse box can short and melt, causing a loss of power in the entire circuit.
For the 1989 Dodge Ram, the heater blower motor resistor can be found on the passenger's side, on the bottom of the heater box. It is beside the blower motor.
It could be the relay
the blower motor is behind the glove box under the dash
where is the heater fan located on a89 ford festiva
Check fuse box - fuse #14
it is next to the firewall near the heater coil
where is heater blower relay for 1989 BMW 535I
Under the windshield wiper you will see a grill it is in there. Pretty tricky to get out. you don't want to make the same mistake I did my blower stopped working and I got a new one only to find out it was the resistor that had burned out.
Replace blower motor resistor usually located in the duct work or out in engine compartment in ductwork by heater motor.
Could be, heater blower motor has failed. blower motor fuse is burned out. blower motor speed resistor is burned out. blower motor switch is bad. or, if the blower motor works but you have no heat it could be, cooling system is low on coolant. thermostat is stuck open. heater core is plugged. temp blend door actuator is faulty.
Check blower motor fuse Check to see if blower motor is getting power
There is no heater fuse, the heater works by having hot coolant run threw a heater core that's inside the dash, then when you turn the heat on, the blower motor blows threw the heater core, sending the hot air inside the vehicle.
The most common problems will be with either the power or the ground going to the the blower motor.................
if the blower motor still works, somebody probably bypassed the heater core in the past.
Answer 1. blown fuse 2. broken wire 3. broken heat sensor (on side of heater housing, inside car) 4. burnt wires 4. bad blower motor speed resistor 5. bad blower motor 6. bad blower motor switch
On a 1989 Chevy Celebrity the heater hose leaves the water pump via a hose barb then runs along the top of the passenger side frame rail and then into the heater core. The heater core is in the firewall below the blower fan on the passenger side of the car. The return hose leaves the heater core and runs along the firewall then to the water outlet below the thermostat.
Possible causes are low anti freeze in radiator. Heater core could be plugged. Your dash controls may not be working. Plugged heater hoses.
Either the electrical flow between the battery and the switch is faulty or the connection between the switch and the blower is faulty. Could be an inline fuse.
Might be a bad heater control
Check for a blown fuse. If the fuse is good then apply 12 volts directly to the blower motor. If it runs then the Blower Motor Resistor Pack is defective. If it does not run the motor itself is defective.
You need to be more specific as to what is not working. The blower doesn't work? No air comes out? Air comes out but is cold?
RH under hood, between blower and evaporator according to diagram. The blower control module is most likely the culprit. It was on my 87 covette ,easy to replace but cost about $150.00
Check and make sure your not low on coolant. The last place in your cooling system will be the heater core so if you are low on coolant then you will have no no heat even if your operating temp is normal and everything is operating properly. If you have AC, you will also have a heater control valve that turns off the water flow when the AC is working so it won't have to compete with the heater. These valves use vacuum and if it is corroded inside, it may not open to allow the hot water to enter the heater hence no heat.
Low coolant level? Cooling system airbound? Bad thermostat? Water pump not circulating coolant? Heater control cable not working?
The thermostat may be stuck open.