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Re: 2005 f-150 heater motor only blows on high
If it is a manual system(knobs) it is the blow motor resistors that are bad,if it is electronic then it is the blower speed controller. The location is the same just looks different. Look under dash on passenger side and it will be bolted to the heater housing.There will be a 4 wire connector if it is manual system wire colors are BR/WH,DB/WH,YE/RD,BK. If it is the electronic system the wire colors are BR/WH,BR/YE,LB/OG,BK
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Check the heater control switch,,,,,and the number of wires at the heater motor....Some motors have more than one winding...in which case there will be three or more wires going into motor..there can be burnout in those windings and will require a new motor....check the plug which attaches to the motor....can be bad connection...or at the switch.....but if there is only two wires....then the heater switch uses resistors to slow down the different speeds...and direct connection for high speed....and the problem is definitely the switch...
probley the restor that gives the a/c heater fan motor its power for the low/ medeam speds has gone bad and onley letes it run on high speed because it gives the fan motor full battery voltage on high speed. it should be located in the heater box were the fan will blow air across it to cool it when it is in use GEORGE STIRBER DBA AUTO ENGINEERING
if the motor does't work at all then it's probably the motor,if the resister is gone you should still have high,it does'nt go through the resister.you may have a bad ground to the resister,you may need a relay.