An expert who has achieved level 2 by getting 100 points
An expert that got 5 achievements.
An expert whose answer got voted for 20 times.
An expert who has written 20 answers of more than 400 characters.
Re: heater fan inoperable
Could be the fuse or the relay control,unhook blower motor and use a jumper wire with 12volts to make sure the problem is not the fan motor.then check the fuse,relay,and lastly the blower motor resistor
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
Processor? This system consists of a control unit ( switch/selectors ) a blower motor resistor and a blower relay. If the blower fan is not working on all speeds, suspect a resistor ( common problem ). If the fan is inoperable, possible fan motor,fuse,relay,wiring and in some cases the resistor as well. The resistor is located under the passenger side dash area close to the heater motor. The wiring coming from the heater motor will plug into the resistor
if the lower fan speeds dont work but the fastest speed does the heater fan resistor block needs replacing. If the highest fan speed doesnt work leave it on there and check for power at heater blower fan, if power is on one wire and the other is an earth the blower motor fan needs replacing. Use a normal globe test light to check this. If no power on any wires to fan go back and check all fuses in car and under bonnet with same test light. If fuses are ok possible open circuit wire to fan.
your fan speed regulator located on your heater core box is bad if its just one or some of the speeds. if the fan does not work at all its either a bad connection to your fan speed regulator or the fan motor has quit. out
This is a common issue with most vehicles. The blower motor uses a resistor to control the fan speeds. Once the resisters burn out, making them inoperable, it will only work on high position. The saftey is that it will work on high only, so the vehicle will have some type of air movement, and then the heater/cooling control can be used. Craig
There should be a relay that provides power supply for the fans.
If the fans only work on high speed, the fans are not faulty.
The most likely cause is a faulty fan speed control resistor module.
The resistor module is usually located in the blower fan ducting, in the fan air flow. It is typically a plugin unit, affixed to the ducting with a couple of screws.
locate the rear heater hoses, make sure eng is at operating temp.
fill of the 2 hoses , should be worm tot he touch, if one is hot and the other is luke warm, the problem is in the circulation in the rear heater core. thanks and good luck . let me know. kindest regards Bill ps. don't over look the fan speed at the rear core.