At Fixya.com, our trusted experts are meticulously vetted and possess extensive experience in their respective fields. Backed by a community of knowledgeable professionals, our platform ensures that the solutions provided are thoroughly researched and validated.
- 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.
Hi D, I suggest you take the vehicle and have a digital diagnostic scan carried out on the vehicle. The problem seems related to one of the speed sensors and the scan will identify which. Regards John
i woulkd take switch off and rewire it. It is not a very difficult thing to do. As you take it apart just pay atention to where the speed control wires are running from and go from there. If it still dosent work than the switch is burnt out
Check the air filter and clean. If you can, raise the blower speed up to the next speed. Make sure all of the supply and return grills are open. Is the ductwork connected under the home and well insulated? Does the furnace ever stop or keep on running? If it does stop, you may have a bad thermostat.
i would say it is the electrical sender on the gbox, trans, unless it continually drops to zero then i would say it is an earth problem in the dash but if it goes up over the spped you are doing then under etc etc, then the problem is the elec signal being sent by the speed sensor on the trans. hope i have been of some assistance.
fan blower speed switch under hood usually in fire wall or in heater box under dash area if you do not change it you will keep losing all your speeds until nothing left! it is not!!!!the one in your dash that you hand operate! hope this helps.John
However you can click here for support: 
×