blower motor not working

If it works hooked to a power source, check your wires with a meter or test light, any Juice at the plug? If not and resistor and control panel good, check your ignition switch. Any new add ons? Radio? etc...

No, there is no power coming to the plugs that connect to the motor or to the resistor.

No new add ons either. Can ignition switch work for everything except the blower motor?

Yes, Fords have 2 and some have 3 accessories on them.
I asked about add ons because remote start kits need relays to turn the blower on to warm or cool the interior, and t relay there may be the problem.

how do i go about checking my ignition switch?

IGNITION SWITCH 1. To inspect ignition switch for mechanical operation, rotate ignition switch through all positions. If lock cylinder does not bind, and returns from START to RUN position without assistance, go to next step. If binding or switch does not return from START or RUN positions, replace ignition switch as necessary. 2. To test electrical function of ignition switch, disconnect ignition switch harness connector. Check continuity between specified switch terminals. See IGNITION SWITCH CONTINUITY table. See Fig. 5 . If continuity is not as specified, replace ignition switch. See IGNITION SWITCH under REMOVAL & INSTALLATION.

Ignition switch checks out as fully functional on ACC and RUN. I assume I have a broken wire somewhere. All of the components in the blower motor circuit test out as good. Any other ideas?

OK Ready? You asked for it! Here's all info on testing the blower problem: TEST B: BLOWER MOTOR INOPERATIVE 1. Turn ignition off. Check Central Junction Box (CJB) fuse No. 22 (10-amp). If fuse is okay, go to step 3 . If fuse is blown, go to next step. 2. Remove A/C blower relay from blower/flasher relay block (located behind center of instrument panel). Disconnect function selector switch 4-pin harness connector C217. Measure resistance between ground and function selector switch harness connector C217 terminal No. 1 (Brown/Orange wire). See Fig. 4 . If resistance is 10 k/ohms or more, repair short to ground in White/Violet wire between function selector switch and CJB. See WIRING DIAGRAMS . 3. Check Battery Junction Box (BJB) fuse No. 105 (40-amp). If fuse is blown, go to next step. If fuse is okay, go to step 7 . 4. Disconnect blower motor 2-pin harness connector C190. Turn ignition switch to RUN position. Measure resistance between ground and blower motor harness connector C190 terminal No. 2 (Brown/Yellow wire) while moving function selector switch through all positions. See Fig. 2 . If resistance is 10 k/ohms or more in all positions except off, replace blower motor. If resistance is less than 10 k/ohms in all positions except off, go to next step. Fig. 4: Identifying Function Selector Switch Harness Connector C217/C220 Terminals Courtesy of FORD MOTOR CO. 5. Turn ignition off. Remove blower motor relay from blower/flasher relay box (located behind center of instrument panel). Measure resistance between ground and blower motor harness connector terminal No. 2 (Brown/Yellow wire). See Fig. 2 . If resistance is 10 k/ohms or more, go to next step. If resistance is less than 10 k/ohms, repair short to ground in Brown/Yellow wire between blower motor relay and blower motor. See WIRING DIAGRAMS . 6. Measure resistance between ground and BJB fuse No. 105 (40-amp) terminal No. 2 (Black/Light Green wire). If resistance is 10 k/ohms or more, replace A/C blower motor relay. If resistance is less than 10 k/ohms, repair short to ground in Black/Light Green wire. See WIRING DIAGRAMS . 7. Disconnect blower motor 2-pin harness connector C190. Turn ignition switch to RUN position. Measure voltage between ground and blower motor harness connector C190 terminal No. 2 (Brown/Yellow wire) while moving function selector switch through each mode. See Fig. 2 . If more than 10 volts exists in all switch positions except off, go to next step. If more than 10 volts does not exist in all switch positions except off, go to step 10 . 8. Turn ignition off. Turn blower motor switch to HI position. Measure resistance between ground and blower motor harness connector terminal No. 1 (Orange/Black wire). See Fig. 2 . If resistance is less than 10 ohms, replace blower motor. If resistance is 10 ohms or more, go to next step. 9. Disconnect blower motor resistor 4-pin harness connector C191. Measure resistance of Orange/Black wire between blower motor harness connector terminal No. 1 and blower motor resistor harness connector terminal No. 2. See Fig. 1 and Fig. 2 . If resistance is less than 5 ohms, repair Black wire between blower relay and ground. See WIRING DIAGRAMS . 10. Turn ignition off. Remove blower motor relay from blower/flasher relay block. Measure voltage between ground and blower motor relay socket terminal No. 87 (Black/Light Green wire). See Fig. 5 . If 10 volts or more exists, go to next step. If less than 10 volts exists, repair Black/Light Green wire between BJB and blower relay. See WIRING DIAGRAMS .Fig. 5: Identifying Blower Relay Connector Socket Terminals Courtesy of FORD MOTOR CO. 11. Turn ignition switch to RUN position. Measure voltage between ground and blower motor relay socket terminal No. 86 (Brown/Orange wire). See Fig. 5 . While selecting each mode on function selector switch. If 10 volts or more exists in all positions except off, go to step 14 . If 10 volts or more does not exist in all positions except off, go to next step. 12. Turn ignition off. Disconnect function selector switch 4-pin harness connector C217. Turn ignition switch to RUN position. Measure voltage between ground and function selector switch harness connector C217 terminal No. 2 (White/Violet wire). See Fig. 4 . If 10 volts or more exists, go to next step. If less than 10 volts exists, repair open in White/Violet wire between CJB and function selector switch. See WIRING DIAGRAMS . 13. Turn ignition off. Measure resistance of Brown/Orange wire between function selector switch harness connector C217 terminal No. 1 and blower motor connector socket terminal No. 86. See Fig. 4 and Fig. 5 . If resistance is less than 5 ohms, replace function selector switch. If resistance is 5 ohms or more, repair open in Brown/Orange wire. See WIRING DIAGRAMS . 14. Turn ignition off. Measure resistance between ground and blower motor relay socket terminal No. 85 (Black wire). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Black wire. 15. Disconnect blower motor 2-pin harness connector C190. Measure resistance of Brown/Yellow wire between blower motor relay socket terminal No. 30 and blower motor harness connector C190 terminal No. 2. See Fig. 2 and Fig. 5 . If resistance is less than 5 ohms, replace blower motor relay. If resistance is 5 ohms or more, repair open in Brown/Yellow wire. See WIRING DIAGRAMS .

Sorry for waiting so long, but I finally started digging into my problem. It appears my problem is a broken/corroded wire from the fuse box under the hood to the blower motor relay. I found a big "hole" in it just a short distance from the fuse box. Thank you for all of your help. I'll let you know if it's working in the next few days. Again, thank you.

your welcome!

MERLIN2021 Thanks for the in depth descriptions. I have to start on mine hunt down mode for the blower problem..but mine is 19 years old and never given me problems..I'm about of the opinion that the motor is history..relays may be too..but I appreciate your layout of things to do..

Hello,

There is a blower motor relay or fuse that can be bad. Here are some guides and wiring diagrams (Below) that will help us figure the problem out and get it fixed.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

and

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

and

https://www.2carpros.com/articles/blower-fan-motor-works-on-high-speed-only

Please let us know what you find.

Cheers, Ken

mine is a 98 5.4L. the fuses aren't the problem believe it or not I have the original owners manual that came with my truck. but it wouldn't be that easy. it doesn't work on any speed..just kind of went in and out the day before it finally stopped. makes me think it was maybe the motor but I really can't afford to throw parts at it. So trying to find what's wrong. thanks will try all above.

Please let us know what happens and upload pictures or videos of the problem.

Cheers, Ken