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so the speed control switch would need to be replaced correct or the connections to the speed control switch would be not properly connected check the wires going to the switch first is the switch a dial type in which you turn to go higher or a click type of switch?if its the dial type just order a new switch unfortuantly you would have to order this part directly from viking there parts are pretty hard to find at other dealers of parts and suppliers hope this helps any other questions that i can help you with message me back have a great dayso the speed control switch would need to be replaced correct or the connections to the speed control switch would be not properly connected check the wires going to the switch first is the switch a dial type in which you turn to go higher or a click type of switch?if its the dial type just order a new switch unfortuantly you would have to order this part directly from viking there parts are pretty hard to find at other dealers of parts and suppliers hope this helps any other questions that i can help you with message me back have a great day
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If your blower motor has only one terminal going to it that means the switch is where the problem is. Blower motors like this are controlled by a switch that has a rheostat or resistors built in to the switch.
When you turn the switch to the low position the fan runs slow because of more resistance thus reducing the voltage to the motor. When you turn the fan to the high position the fan runs at full speed because it is getting 12 volts.
Now some switches use a electronic board to control the speed. You need to do a search and replace the fan control switch.
One other thing - my Volvo had the same problem and I ended up replacing the whole dash module - new it costs $325.00 but I picked one up at the junk yard "pull-a-part" for $35.00.
The circuit diagram for the standard control model shows the blower has a two-speed motor, connected directly to the power line in "Cool" mode, or connected to the temperature control in "Cook" mode. When the blower slows down during cooking, switch it temporarily to "Cool" mode. If it goes to normal speed, the problem is with the mode switch contacts or the wiring terminals between the fan mode switch and the temperature control board, or the control board itself.
If the speed does not change, check the wiring terminals at the speed switch common terminal (I assume your problem occurs in both low and high speeds). If you find tarnished, loose, or burned terminals, clean, repair or replace as needed. (In extreme cases, a loose terminal will cause the wire to overheat, damaging the insulation, oxidizing the terminal and causing a high-resistance condition that will reduce the voltage available to the motor.) If the connections are all good, the motor bearings are probably getting sticky at high temperatures. Let the oven get hot enough for the blower to slow down, then shut it off and check the blower bearings while wearing oven mitts.
Yes,could be your blower resistor is bad,it's right next to the blower motor,it controls the blower motor speed,easy to replace. Duralast Blower Motor Resistor Just took a guess at the model type since you didn't state,wow,high dollar price,guess it comes with a Mercedes,paid about 18 bucks for mine on my 85 Nissan.
The resistor bank is bad for slow speeds, the switch is bad for high speed. In your test, you have voltage, but the switch wont carry the amps, to run high speed. Open circuits will not blow fuses. Replace both switch and resistor bank for all speeds. Make sure to clean leaves and trash from fan housing and see if fan spins freely.
Good Evening, If I am translating this properly your fan only works on the high setting? And the other settings do not change the speed? If this is correct respond back and I will help as much as possible.
Probably not. If it runs on high, it is probably good. Unless is sounds slow or 'tight' on high, or squeaks or chips , etc. Run the fan with the engine off and then shut the fan off and listen and see if you can hear how long it takes to slow down. If it stops in just a second or two, the bearings are tight (dry). If it spins down normally, maybe three to eight seconds or more, the motor is fine. You really don't need this check.
It is most likely your blower relay. Most cars have one or two relays to control the fan motor, which is a single speed motor that the relays and speed switch and blower resistor control the power to.
One relay is for high speed, also switch contact. One relay is for other speeds and divert current through a blower resistor located by the fan duct under the dash or under the hiid by the fan. Also the switch contacts for each speed.
It cad be the dash switch, which has to handle the blower resistor current for all the lower speeds is burned out at those speeds. It can be the low speed blower relay, as I mention above, is burned out, this is most frequent cause. it can be the blower resistor is burned out, this can give no low speeds, or loose speeds below a certain speed setting.
Try you manual for the blower relays' positions. Try swapping with the horn relay to test if it is the same type of relay. Take out the blower resistor carefully (pretend you are defusing a bomb or playing "operation" game as it has exposed coils that are delicate and if you bump the sides of the opening as you extract it you will damage it and short the coils against each other). the wire coils are very fine bare wire coils that look like springs and if touching can burn out. Switch is harder to test because hard to get at, check the other things first. You should be able to test for voltages at the resistor plug to see if power is coming from the switch, but wiring schemes can vary. Post back or use shop manual to troubleshoot the switch.
mine did the same thing - there is a wire harness on the passenger side that passengers kick with there feet - this can be jiggled and the fan wil start working on all speeds in my truck - hope your fix is as simple
pull motor ,check for burned wires onfan and bak of fan speed switch,fan could be the problem un hook fan and conect directley to 12 volts and see if varibles exsist,if so replace fan motor/look for a fan resister if all the other things check out
so the speed control switch would need to be replaced correct or the connections to the speed control switch would be not properly connected check the wires going to the switch first is the switch a dial type in which you turn to go higher or a click type of switch?if its the dial type just order a new switch unfortuantly you would have to order this part directly from viking there parts are pretty hard to find at other dealers of parts and suppliers hope this helps any other questions that i can help you with message me back have a great day
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