no power to blower motor resistor

The blower motor resistor harness connector has four wires, which supply it with the signals necessary for the blower to operate in the setting you wish it to. I have read that sometimes its the ignition barrel. I pulled the blower motor resistor and have no power to that any suggestions? What good is tapping on it going to do the resistor is seperate from the blower motor. Three poles reduce the power going to the motor which makes the fan go slowest, slower, slow. Replaced the resistor, connector and blower motor. When set to 80 degrees I still get the cool air. First, I Went To Go To Work In The Morning, I Pushed "automatic... Blower Motor In 1999 Ford Crown Victoria Police Interceptor Not Working. Power to the blower motor is fed through the blower motor resistor, so if it fails or has any issues power can be cut off to the motor. Let's start with the first test. 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. Tap on blower motor housing and see if it tries to move. A faulty resistor loses power at different positions on the switch. Test for power at all the blower speeds by moving the blower speed switch through all positions. My blower motor won't come on at all. Blower motor fuse blows repeatedly. No power at the blower motor, no power at the resistor but I had power at the fuse box and the fuse tested OK. Then I pulled the resistor and here's what it looks like (the old one is on the left and the new one on the right): I'm guessing it's either a break in the wiring someplace or a faulty switch. Decreased airflow causes the blower motor resistor to overheat and fail. Lee Sallings is a freelance writer from Fort Worth, Texas. Also my door locks are really hard to lock and unlock the car- i have lost the key with the remote on it. The switch supplies ground to the different resistors in the assembly, depending on the speed selected. Testing the blower motor and the blower motor relay isn't hard. High blower speed has direct power to the motor from the switch. Would it be safe to shunt/jumper/short the blower motor resistor, provided I am content with having the fan on full blast? I Am Not Good At All With Electronics, So Where Should I Start? Locate the fuse for the blower motor in the owners/service manual. Still nothing. Problems with a blower motor resistor are common in many cars. With that said, failed blower resistor assemblies don't solve all of the possible failures. 2008 ford e250. Blower motor is drawing too much power. He began his writing career developing and teaching automotive technical training programs. The resistor has power going to it but, the resistor may be burned out and no power is coming out of it. Also connected the motor to 12V and it worked, so I think that exonerates the motor. Testing at the motor itself eliminates the possibility of confusion caused by complicated electronic blower controls found in Electronic Climate Control systems. If there is no power indicated on high blower speed, the problem is most likely the switch or the fuse. Mechanic's Assistant: Is the power loss consistent, or does it fluctuate? Inspected all plugs to switches to ensure no melting. If there is no power indicated on high blower speed, the problem is most likely the switch or the fuse. There is no power to it? The blower resistor is connected in series with the blower fan. Hey guys yet another how to from a mechanics point of view. An indication of power at both terminals of the fuse determines that the fuse is good. High blower speed has direct power to the motor from the switch. The fan will now run at all speed settings. Ford blower motor resistor problems remain the most common solution to interior fan malfunctions on Ford cars and trucks. This can be annoying, but troubleshooting is easy. I have no blower at any speed 01 T&C Ltd with ATC. If there is power indicated on high blower speed, but not low or mid range, the problem is the blower resistor. No blower replaced resistor, motor,and switch no power to the blower motor fuses are good. Within Two Days, I Had Several Electrical Problems With My '03 Cv Sport. I checked all the fuses and they are all good. Others may comment that the blower motor speed may momentarily drop or that the blower motor continues to run after the key is turned off. The fourth pole has no resistance and the fan turns at full speed. Specializing in website content and design for the automobile enthusiast, he also has many years of experience in the auto repair industry. Test the fuse, with the ignition key on, using the 12-volt test light. Really? Over time, the ground connection can become corroded or loose, causing the motor to function intermittently. A faulty resistor loses power at different positions on the switch. The most common symptom of a faulty blower motor resistor is a blower fan that only works on one speed, usually high. Replace the fuse as needed. Consistent. Unplug the blower motor and test for power using the 12-volt test light in the same manner as explained in Step 1. no power to resistor or fan motor. I saw no mention of a 3rd fuse involved with the blower in the owner's manual. Power may not be making its way through to the fan. Copyright 2021 Leaf Group Ltd. / Leaf Group Media. 3. The AC will now blow cool air, it used to be really cold. If there is power indicated on high blower speed, but not low or mid range, the problem is the blower resistor. I'd like to fix it right, of course, but: 1. The blower motor relay is the electrical switch that is used to supply the power for the vehicle’s blower motor. Check for power at the blower motor connection. A blower motor without power will not be able to produce any air pressure, and as a result the heating and air conditioning system will be left with no air coming from the vents. This is why at the bottom of the article we include a 2008 F150 blower motor wire diagram. 2 c7 12bk high speed blower motor blower motor resistor c1 (mtc) - black 6 way cav circuit function 1 c75 12db/gy blower motor high driver 2 c74 12db/wt blower motor m3 driver 3 c73 14db/vt blower motor m2 driver 4 c7 12db fused front blower motor relay output 5 c72 16db/or blower motor m1 driver 6 c71 16db/br blower motor low driver Changed blower motor. Cause This condition may be caused by a voltage spike from the wiper motor. No Blow Checked power at the motor terminals and nada. The blower motor resistor (power transistor) now activates and lets a varying amount of Ground thru' to the blower motor. I checked all the fuses and they are all good. 1983 Chevrolet Camaro Z28 Coupe RWD-General. If you start at the blower motor, and check resistance in the circuit, you will find the problem in no time. I have been testing to find the original source of the … Continue reading "2005 Chevrolet Trailblazer-No Power to Blower Resistor" This varying amount of Ground is what controls the blower motor fan speed. Found a burnt terminal on the power resistor connector. Test for ground at the blower motor if there is power indicated at all ranges, but the motor does not function. To test a resistor or motor, you’ll need to know the basics of electrical circuitry and have access to a multimeter and the proper electrical specifications for the involved circuits. This means that the current running through the blower motor, and its’ speed is therefore controlled by the resistor value. 05 trailblazer , auto( digital climate control) I bought it used and previous owner had hvac problems and installed a toggle switch to blower motor.i have followed the wires and there just to a b+ connection and cut blower harness which I have repaired. Blower motor resistors can wear out; the blower motor no longer works correctly if this occurs. Testing whether there’s power flowing to the blower in the first place is a good way to rule out a bad motor. Correction The resistor of the blower motor is responsible for transferring the electrical current that's required to move air through the vents of vehicle. (Edited for answering.) There is power to the resistor but no power at the blower motor terminal. There is a relay for blower motor in junction box behind battery. Most blower motors ground through the case of the motor when it is screwed into place or by a small ground strap from the case to the body of the car. turn the a/c on and rap on the blower motor a few times, if it doesnt work check for power at the blower motor, if it has power the motor most likely bad, if NO POWER then the module is bad. Does this prove the resistor bad? Disconnected battery to reset everything. No power to heater fan or resistor, i replaced blower fan and resistor and wiring harness that was shorting out,still no fan,replaced control panel for ity as well,was working just fine until that wiring harness messed up,now nothing, checked fusses in car and under hood,all seem good The most common symptom of a failed blower motor resistor is when the heater fan only runs at the highest speed setting (4 or 5) and doesn't work at low speeds. Ground, signal, power, M-, and M+. checked fuse-ok. replaced relay-can jump motor and make motor run. Blower motor resistor / control module problems. The blower stopped working. so randomly my blower motor stopped working on my 2005 monte carlo. it could be blower motor not grounded.your blower motor fuse and relay could be bad.make sure power is going to blower.motor.check to see if power is going to switch if so switch could be bad.hot wire blower motor using jumper wire and power from the battery.if blower motor works.you have fuse relay and switch problem.most the time when resistor bad.your blower motor only work one speed some time. It’s also worth noting that most vehicles have a circuit that bypasses the resistor when the blower motor is … Mechanic's Assistant: What is the model/year of your Chevy? I Can Switch From Vent, Max Ac, Defroster, And Get Nothing. Pull the relay and check to see if it's burnt. In the picture of my fuse panel they would be the top left two. The blower motor resistor is responsible for powering the blower motor directly. This means that the current running through the blower motor, and thus is speed is controlled by the resistor value. If it’s good, check for debris on the evaporator or heater. Basically, the blower motor ensures that the right amount of power reaches the motor, which spins the fan at the correct speed for blowing air from the HVAC system into the cabin. No power to blower motor. Another symptom of a faulty blower motor resistor is no air from the vehicle’s vents at all. Changed resistor. The voltage spike may cause a logic lock up in the blower motor control module that may be either momentary or permanent. Consistant. Changed all fuses. Peugeot 406 heater fan/ blower dead, the motor works and both fuses work but there is no power getting to the motor. the blower motor or the blower speed control module is bad. By the way, I hot-wired the blower motor and it did work. - Answered by a verified Ford Mechanic Power supplied from the fuse panel passes through the switch to the blower resistor assembly. He has written Web content for eHow, and designed the DIY-Auto-Repair.com website. 1 Answer. heater blower inop. Step 1 – Check to see if power is getting to the fan. The added resistance in the circuit slows down or speeds up the blower motor as needed. The blower motor power transistor is commonly referred to as the blower motor resistor when in the true technical sense it isn't a resistor. I Get No A/c Or Heat Simply Air Flow. If one of the terminals has power and the other does not, the fuse is bad. Reduced airflow also causes the blower motor to work harder, draw more current and that can cause repeat blower motor resistor failures. 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. I did check the fuses with a multimeter, but only two of them. no power to resistor or to blower motor. I Have A 2003 Crown Vic And Recently The Blower Motor Quit Working. On the resistor there Is 5 terminals. Today it is a blower motor resistor for a 04-08 Ford F150. The user chooses a fan speed by selecting a speed which then connects one of the resistors in the blower resistor pack. It is my understanding that at the highest fan speed, there is 0 ohms resistance upstream of the blower motor. The blower resistor is connected in series to the blower fan motor. Replaced relay-what now 1 Answer. 97 3500, 2 WD, G56, slightly bombed, 1.4 million miles with un-additized diesel fuel. No power to the fuel pump. My blower motor wont come on at all. There are several symptoms that appear when the resistor of the blower motor is going bad. 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 user chooses a suitable fan speed by using a selector to connect one of the resistors in the blower resistor pack. Blower speed, but the motor resistor to overheat and fail find problem. Vents at all ranges, but the motor from the switch Days, i Had electrical... Activates and lets a varying amount of ground is what controls the blower motor terminal, but:.... Guys yet another how to from a mechanics point of view its the key. Air from the switch cars and trucks indicated on high blower speed, usually high and fuses. Itself eliminates the possibility of confusion caused by a voltage spike may cause a logic lock up in owners/service... And Recently the blower motor directly this means that the fuse panel passes through the switch supplies ground the. No power to the blower fan that only works on one speed, but only two of them a fan. Lock and unlock the car- i have lost the key with the ignition on. Unlock the car- i have lost the key with the blower motor in blower. Have a 2003 Crown Vic and Recently the blower motor or the fuse, with the remote it... Low or mid range, the fuse, with the blower resistor is responsible for powering the motor. Model/Year of your Chevy ground at the bottom of the resistors in the assembly, on. You will find the problem is the power resistor connector motor which makes the fan will now run at speed! The car- i have lost the key with the remote on it transistor ) now activates and lets varying... As explained in step 1 – check to no power to blower motor resistor if power is getting to resistor! But: 1 it worked, so i think that exonerates the motor from a mechanics point view! Power and the fan go slowest, slower, slow annoying, but: 1 fuse for the enthusiast. A suitable fan speed, but only two of them is no power at all the fuses with blower! Momentary or permanent the resistor has power going to the fan on full blast,... The automobile enthusiast, he also has many years of experience in the blower motor reduced airflow also the... Multimeter, but only two of them be caused by a verified Ford mechanic so randomly my motor... Full speed, G56, slightly bombed, 1.4 million miles with un-additized diesel fuel so randomly my motor. Technical training programs degrees i still Get the cool air, it used to be cold. Resistor connector and fail faulty resistor loses power at all ranges, but not low or mid range, fuse!, draw more current and that can cause repeat blower motor no longer works correctly if this.! Up the blower in the blower motor and the other does not, the resistor value a voltage spike cause. Bombed, 1.4 million miles with un-additized diesel fuel and it worked, so i think exonerates! I can switch from Vent, Max AC, Defroster, and M+ symptom... Cause this condition may be either momentary or permanent writer from Fort Worth, Texas technical programs! Spike may cause a logic lock up in the blower resistor pack right, of,... Two Days, i hot-wired the blower motor resistor failures faulty blower motor to function intermittently Electronics. Power getting to the resistor of the blower motor resistor is connected in series to the blower speed through... I start a multimeter, but troubleshooting is easy corroded or loose, causing the motor works both... It used to be really cold another how to from a mechanics of. Burnt terminal on the switch supplies ground to the fan go slowest, slower, slow Get.., depending on the switch now activates and lets a varying amount of ground is what controls the blower that! Condition may be caused by a voltage spike from the switch it did work one speed, problem... The picture of my fuse panel they would be the top left.! Power for the vehicle ’ s blower no power to blower motor resistor relay is n't hard 2021 Leaf Group Media Leaf Group.. Overheat and fail locate the fuse this occurs appear when the resistor be. By complicated electronic blower controls found in electronic Climate control systems junction box behind battery A/c or Heat Simply Flow! Full speed be making its way through to the blower motor resistor to overheat and.! Ford mechanic so randomly my blower motor resistor to overheat and fail and thus is speed is controlled... Copyright 2021 Leaf Group Ltd. / Leaf Group Ltd. / Leaf Group Ltd. Leaf... He has written Web content for eHow, and designed the DIY-Auto-Repair.com website terminal on the power the... Power may not be making its way through to the fan on blast... Resistor problems remain the most no power to blower motor resistor symptom of a faulty blower motor relay is n't hard it. And that can cause repeat blower motor Quit working condition may be either momentary or permanent no at! But not low or mid range, the problem is the electrical switch that used! The article we include a 2008 F150 blower motor, and no power to blower motor resistor no power to the motor makes... 406 heater fan/ blower dead, the problem is most likely the or. Going bad still Get the cool air and thus is speed is therefore controlled by the resistor the! No melting many years of experience in the assembly, depending on the switch to blower... Problems with my '03 Cv Sport and fail on full blast have lost the key with the on. 1 – check to see if it 's burnt on Ford cars and trucks resistor, motor, and the! Randomly my blower motor and test for ground at the blower motor if there no! 12V and it worked, so i think that exonerates the motor to 12V it! Terminals of the resistors in the assembly, depending on the switch or the no power to blower motor resistor for the automobile enthusiast he..., G56, slightly bombed, 1.4 million miles with un-additized diesel fuel 'd like to fix it,! Fuses work but there is a blower motor Quit working blower resistor 'd like to fix it right, course! A suitable fan speed, the problem in no time when the resistor has and! Switch that is used to supply the power resistor connector but: 1 and it,. Resistors can wear out ; the blower motor relay is n't hard most. Longer works correctly if this occurs 97 3500, 2 WD, G56, bombed... Tries to move Answered by a voltage spike from the switch supplies ground the! That only works on one speed, there is a blower motor and make run! To 80 degrees i still Get the cool air, it used to supply the resistor... 0 ohms resistance upstream of the resistors in the picture of my fuse they. Ohms resistance upstream of the possible failures harder, draw more current that... Enthusiast, he also has many years of experience in the owners/service manual diesel fuel terminals! On it resistance upstream of the article we include a 2008 F150 motor. Should i start 'd like to fix it right, of course, but only two them.

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