There is power to the resistor but no power at the blower motor terminal. The switch supplies ground to the different resistors in the assembly, depending on the speed selected. (Edited for answering.) Power may not be making its way through to the fan. This means that the current running through the blower motor, and its’ speed is therefore controlled by the resistor value. The fan will now run at all speed settings. I saw no mention of a 3rd fuse involved with the blower in the owner's manual. from what i atleast thought was the blower motor resistors, 2 wires coming from the blower motor purple and black go to a small board with aluminum finns on the back side, and has a small grey and larger black and red wires going into it aswell. High blower speed has direct power to the motor from the switch. This is due to the fact that the blower motor power transistor does pretty much the exact same job as the old style resistors of vehicles of the 80 and 90's. 1983 Chevrolet Camaro Z28 Coupe RWD-General. If there is power indicated on high blower speed, but not low or mid range, the problem is the blower resistor. What good is tapping on it going to do the resistor is seperate from the blower motor. There is a relay for blower motor in junction box behind battery. A faulty resistor loses power at different positions on the switch. If you start at the blower motor, and check resistance in the circuit, you will find the problem in no time. Changed all fuses. Ford blower motor resistor problems remain the most common solution to interior fan malfunctions on Ford cars and trucks. The user chooses a suitable fan speed by using a selector to connect one of the resistors in the blower resistor pack. My blower motor wont come on at all. Mechanic's Assistant: What is the model/year of your Chevy? I Am Not Good At All With Electronics, So Where Should I Start? First, I Went To Go To Work In The Morning, I Pushed "automatic... Blower Motor In 1999 Ford Crown Victoria Police Interceptor Not Working. An indication of power at both terminals of the fuse determines that the fuse is good. Test the fuse, with the ignition key on, using the 12-volt test light. A faulty resistor loses power at different positions on the switch. - Answered by a verified Ford Mechanic The blower motor resistor is responsible for powering the blower motor directly. Would it be safe to shunt/jumper/short the blower motor resistor, provided I am content with having the fan on full blast? This is why at the bottom of the article we include a 2008 F150 blower motor wire diagram. The blower motor resistor (power transistor) now activates and lets a varying amount of Ground thru' to the blower motor. By the way, I hot-wired the blower motor and it did work. The added resistance in the circuit slows down or speeds up the blower motor as needed. Disconnected battery to reset everything. Replaced relay-what now 1 Answer. no power to resistor or fan motor. The user chooses a fan speed by selecting a speed which then connects one of the resistors in the blower resistor pack. I Get No A/c Or Heat Simply Air Flow. Let's start with the first test. Really? Replace the fuse as needed. I checked all the fuses and they are all good. No power to the fuel pump. Cause This condition may be caused by a voltage spike from the wiper motor. Testing whether there’s power flowing to the blower in the first place is a good way to rule out a bad motor. High blower speed has direct power to the motor from the switch. Does this prove the resistor bad? Also connected the motor to 12V and it worked, so I think that exonerates the motor. Changed resistor. This can be annoying, but troubleshooting is easy. If there is no power indicated on high blower speed, the problem is most likely the switch or the fuse. Power supplied from the fuse panel passes through the switch to the blower resistor assembly. Peugeot 406 heater fan/ blower dead, the motor works and both fuses work but there is no power getting to the motor. Attach the clip lead of the test light to a good ground like a bolt screwed into metal, and touch the sharp probe end to the terminals on the fuse. The blower stopped working. Also my door locks are really hard to lock and unlock the car- i have lost the key with the remote on it. With that said, failed blower resistor assemblies don't solve all of the possible failures. When set to 80 degrees I still get the cool air. Consistant. Reduced airflow also causes the blower motor to work harder, draw more current and that can cause repeat blower motor resistor failures. checked fuse-ok. replaced relay-can jump motor and make motor run. Still nothing. 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