I have an 1985 ford mustang 5.0 5 sp,I have checked all the fuses and there is no power to the heater resiste of any kind,could there be a bad switch at the controls? This has been going on intermitinly for the past 6 months or so,ths 2 prong plug to the blower is chard on the black wire,Thank you,Walt...
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Re: no power to the heater blower
Walt, it sounds like you have found your problem, this is common when the motor starts going bad. This cause it to pull to many amps and the black wire has gotten hot, most probably causing the plug to have a bad connect. I may not full understand your question but if there is not power to the resistor then the switch could be bad also. Very possible the switch could be bad, in that case pull switch and check for proper operation with a voltmeter. The resister should be checked the same way. Always when checking a circuit make sure you have power at the switch to eliminate the possibility of a bad fuse. I hope you find this helps.
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The heater blower motor needs to be checked.If the resistor is replaced but still the motor is not getting started then its faulty heater blower motor.Get the 12 volt checked by meter to confirm power to the motor.If no power then its faulty motor causing this problem.
Make sure the radiator pressure cap is the correct one and that the hose is not soft--check the lower hose and heater hoses for softness as well. They should be firm, but not hard or cracking. The temperature sensor is reporting normal operating temperature, so it and the thermostat are working correctly (hot water would blow out of the radiator if it were stuck). Check the cooling fan for free turning and no noise. Check it's grounding connection. Check the fuse box for blown fuses to the fan and to the A/C compressor. Make sure all the relays and fuses are firmly pressed into their sockets. Check the A/C compressor clutch winding for resistance--should not read infinity. Does the blower motor for the heater/A/C run when either is turned on? The A/C switch on the dash may be defective.
chk. to see if you got a heater resister. if no resister. maybe a relay somewhere around blower motor, somepeople call them breakers others call them relays. ford uses alot of fuseable links but i dought there would be any under dash.
If the blower is totaly not working it could be a bad motor or a loss of power (or ground) to the motor. There is a blower motor relay on the power distribution box on the right innner fender. There may be a fuse for the heater circuit, also. Power also goes through a blower motor resister that controls blower speeds. If any one of these are bad it will (can) cause the blower motor to not work. I would first check all your fuses. If you have the ability to check for power continuity (with a test light or multimeter) I would check to see if the motor is even getting power. It is also possible that your heater control switch is not sending power to the relay. Electrical can be hard to track sometimes. Good Luck.