It is for vacuum storage. It keeps blower mode from switching to defrost when accelerating. The mode selection is vac controlled and will default to defrost when vac is lost or low. This stored vacuum keeps that from happening
blower fan location on a 1979 lincoln
How do you replace a defrost blower motor in a 2003 Toyota Corolla
No, the rear defrost is just an electric grid on the rear window. No air movement involved.
blower motor resistor is burned out
Remove the wiring harness from the back of your 1986 Lincoln air conditioning blower motor. Remove the blower motor retaining bolts. Remove the fan on the front of the blower motor. Reverse the process to install the new blower motor.
If you are talkiing about the blower motor inside the vehicle it is under the dash pad and under the defrost duct
It is located under the dash near the blower motor.
If the blower works on the defrost mode only, you could have a disconnected vacuum supply line coming from the engine. If the blower motor doesn't work on any mode or speed you could have a blown fuse, burned out blower motor speed resistor, bad switch or a bad blower motor.
Faulty Function selector switch. Consider replacement.
Defective blower motor resistor module. this is true except if the control module is malfunctioning at which point the defrost goes to emergency mode in which the defrost will stay on permanently. My module will not power up and I need help with wiring schematics to find a bad ground or power wire
Most likely it is a resistor that has blown on the back of the controls.
THE PROBLEM IS NOT THE BLOWER SWITCH.IT IS MORE THAN LIKLEY THE CABLE ON THE AIR BOX HAS CAME OFF.
On the firewall to the right (when facing the firewall) of the blower motor.
If you are sure the blower is working and pushing good air flow, it could be the air flap that changes the flow from defrost to the floor or to the vents is stuck. It may be partly open but not all the way and only allowing limited air flow.
The year, make and model info would help. Also need to know if the blower motor is working, just not getting any heat, or not changing function between defrost, dash or floor vents.
Do you already have the old one out?
In a 1998 Lincoln Mark VIII : In the Power Distribution Box ( which is " live " ) located in the engine compartment ( # 29 is a 40 amp maxi fuse for the Blower Motor Relay )
The blower motor fuse has blown or the blower motor itself has blown. Change the fuse or replace the blower motor itself and you should be good.
bad mode door actuator. Also try to remove the fuse from blower motor for a min of 60 seconds. This causes unit to recalibrate itself. Worked for me
The problem is either the blower motor resistor or the blower speed selector switch.
Passenger side under the dash. If the blower isn't working check that the wire isn't corroded off first, common for this to happen.
Check for a vacuum leak either under hood or under dash Check the operation of the vacuum actuators under dash Check the operation of the selector switch Defrost is the default settting for this system
Defrost uses the a/c, if it doesn't smell the same with a/c only on. The smell is coming from the blower motor. Bmw's for example have a problem where the blower blade contacts the plastic housing and causes it to rub/melt.
what are you tring to fix? mitchell manuals, and aldata manuals have very good diagrams.