Mechanics

F150 BLOWER MOTOR

2001 Ford F-150

Electrical problem
2001 Ford F150 V8 Four Wheel Drive Manual 134000 miles

My 2001 f150 blower quit working. Pulled it out and hook a battery charger to it and it works. Put a new resistor in, didn't help. Checked all of the fuses and relays in the dash and under the hood in the main relay box, all good. Used a different control panel/switch panel and it still won't work. A/C works but not on MAX. Heater/Defroster works. The only thing that isn't working is the blower. Any help would be greatly appreciated.
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Beagleduke9072
June 20, 2010.



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.

Merlin2021
Jun 20, 2010.
No, there is no power coming to the plugs that connect to the motor or to the resistor.

Tiny
Beagleduke9072
Jun 20, 2010.
No new add ons either. Can ignition switch work for everything except the blower motor?

Tiny
Beagleduke9072
Jun 20, 2010.
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.

Merlin2021
Jun 21, 2010.
How do I go about checking my ignition switch?

Tiny
Beagleduke9072
Jun 21, 2010.
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.


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Merlin2021
Jun 22, 2010.
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?

Tiny
Beagleduke9072
Jun 29, 2010.
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 .


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Merlin2021
Jun 30, 2010.
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.

Tiny
Beagleduke9072
Feb 18, 2011.
Your welcome!

Merlin2021
Feb 18, 2011.