Tonight is very cold (-25 C). I went out to start the car. I turned the key and the heater fan came on(I didn't switch it off when I parked). The car started and when I switched the heater on the fan would not come on.
Re: Heater fan will not come on when it switched on.
Locate your blower motor.probably under dash rh side, possibly under hood fire wall area pass. side. unplug connector to blower motor.if older style with one wire check for source voltage present at wire, source voltage meaning voltage present at connector should equal batt. voltage.if connector has 2 wires place multimeter on DC volts across both terminals and reading should equal source with fan switch on high.
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Should have a fuse for it; look for 25 or 30 amp heater fuse. If it's good, pull off the connector at blower motor, and with key on and heater fan switch on high setting, check for power at the connector. If you have power there, then the motor nust be bad and need replacing. If no power at the motor, the switch may be bad, or the wiring or the heater relay needs to be investigated. Good luck.
Hello, Just follow the wire from the heater fan under the hood. Trace the power wire from the heater fan and it will join a connector midway on the Firewall. It will have 2 screws and 1 electric connector. Tap the connector with a screwdriver handle and see if the part starts working again.
If it does not, get a used or new blower resistor. Work on a cold engine and remove the screws and connector from the part. Temporarily plug in the new part to the connector and turn the Key to run with the fan ON. It should be blowing now. Turn off the switch and put the new part where you can reach it with 1 hand.
Undo a heater hose at the top rear of the motor going in front of the opening for the switch. With 1 hand remove the hose end, then switch parts with the new blower resistor with the other hand and slide the heater hose back on its fitting. Tighten the heater hose.
Then secure the new part into the Firewall and fasten its connector. You should have lost little Antifreeze by working on a cold engine as the hydraulic lock kept the fluid from running out.
This should be all you need to do except clean any spills away.
Check the following fuses:
10 amp GAUGE under the dash, and the 40 amp HEATER under the hood.
If both fuses are good, I suspect that you may either have a bad fan switch or a bad heater fan motor. The switches are rare to fail, I would suspect the heater motor first. Please try this: Turn the key on; turn the fan switch to high. Look under & behind the glovebox, for the bottom of the heater fan motor. Round thing with 3 screws holding it to the heater box. Using a small hammer, or something that you can tap with, tap on the bottom of the heater fan motor. You just may jar the motor enough to make it run. If it comes back on, you may need to replace it at some point in the near future. Worked for me quite a few times. Try that, repost to me what happens. Hope this helps.