Why Does My Car Heater Fan Only Work On High

May 20, 2021 Post a Comment

The fan in your car stopped working except when set to the highest setting. Most commonly the fan will only run on the highest setting.

Blower Motor Only Works On High Speed Ricks Free Auto Repair Advice Automotive Repair Tips And How To

The trouble relates to the blower motor and its activation.

Why does my car heater fan only work on high. I put my heat or ac on and the only function that works is on high. Blower Fan Works on High Only This is a classic blower motor resistor problem which is common on older cars and trucks that use manual fan speed switch controls. My 1999 Olds Delta 88 heater fan switch turns blower on only occasionally and even then the high setting cuts off the fanif its working.

My problem is on a 1996 Dodge Caravan 33 liter. When a blower resistor fails the highest fan speed usually is the only one that still works because it essentially bypasses the resistor and receives the maximum amount of voltage. Call the ford dealer get the part -- like 10.

On the low speeds the fan relay routes the voltage thru the resistor block. Any infohelp would be much appreciated. Dude the reason the fan only works on high is because the resistor is bad.

Correcting the problem is straight forward and requires replacement of the small resistor. This problem will also occur on climate control systems when the speed controller has burned out omitting full power to the blower motor. Check continuity in resistor.

Any obstructions or hindrances can blow the resistor quickly. This sounds more like a problem with high speed fan relay. The resistor module is easy and inexpensive to replace.

The voltage for the fan high speed by-passes the resistor block. This can also occur with the ignition key off. On low it runs through a resistor which may be fused.

It mounts under the dash on the firewall on the passenger side. However most car makers bypass the blower motor resistor completely when you move the fan speed switch to high. Check amperage draw at motor on high.

Most car manufacturers use a series of resistors to make the heater blower motor run at different speeds. Typically 50 of fuse rating. Correcting the problem is straight forward and requires replacement of the small resistor.

The resistor is normally found behind the glove box next to the blower motor. How or what do I have to do to fix this problem. If your blower only operates on its highest speed chances are you have the series type of blower motor resistor.

If resistor is bad motor may be going causing high current. BIt isnt the resistor block. My blower motor does come on.

You should check and make sure the blower motor is working properly not jammed or any obstructions preventing the free movement of the bladefins. I need to find the location of this front blower relay and the fuse that powers it. You tried turning on the AC and the different climate controls and its the same.

Then if I turn it off the truck gets steamy pretty quick. Its then typically installed in the ductwork near the car blowereither under the dash or under the hood. When the blower motor switch is in the highest speed position the blower motor resistor wires are bypassed and the blower motor receives a direct path to ground through the blower motor switch.

If you only have high the low circuit or resistor is not getting current. The Haynes manual says the blower is activated by a relay. And yes the resistor is bypassed with the fan is on high.

The most common thing would be the resistor assembly as that goes out more often than the other parts. And when one or more of these resistors burn out youre usually left with only one heater blower motor speedhigh. This occurs because the faulty blower motor.

Probably a bad blower motor resistor you have there or possibly a faulty blower motor or switch. The startup noise could very well indicate failing fan bearings--that could have caused the burnout of the resistor pack. Some have a thermal protection internally that quits.

When you switch to high fan speed the relay switches over to supply full voltage from the battery to the fan motor. The blower motor resistor may be diagnosed using conventional diagnostic tools and methods. Blower motor only working on high speed A common symptom of faulty blower motor resistor is when the heating and air conditioning blower only operates at high speed and cannot be adjusted to low speeds.

The fan switch may be at fault but a more likely reason is that a blower motor resistor that controls the voltage going to the blower has packed it in resulting in only one speed remaining. This is a well documented problem and is caused by a failing blower motor resistor. I need to fix this fast.

Most commonly the fan will only run on the highest setting. The resistor is normally found behind the glove box next to the blower motor. You will find there is a resistor pack that divides voltage to the fan controlling fan speed.

It has AC but is a short body and has no rear heat or AC. You wont likely find it by looking at the system wiring -- just know that it is a flat plastic piece mounted by a screw or two I believe with the plug into it. If it doesnt light up or you only have a high fan speed then your resistor block needs replacement since it is bypassed on high speed.

If the resistor block tests out good and you dont have any fan speed or a slow fan speed for all speeds you can assume that the blower motor is at fault since everything else has tested out ok. While I like the AC on high it sucks when I have my family in the truck and its on high the whole time. This is a well documented problem and is caused by a failing blower motor resistor.

High speed bypasses the pack which is why it still works.

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