Hi I have a 2001 Chevy Silverado extended cab 4x4. The fan blower switch only works in position 1,2,3, Were is the resistor located and do you have pictures of it. What do I have to remove to get at resistor. Can I replace with used or buy new?Thanks a lot.

Answer. This is a very common problem of a burned out blower resistor. Also be sure to check that the connectors are not burned. This is also common on these trucks. the connector with wire leads would need to be replaced if it is. The resistor is located under the passenger side of the dash. It bolts up into the HVAC case with 2 bolts. Just follow the wires from the blower, which is also under there, to the resistor. When i get a chance I will post pictures...


1995 Chevy Silverado ck2500
Engine Size : 5.7
Question Here: Not getting heat out of defroster. Selector switch allows heat out at floorboard and chest but not out of defrost. Checked voltage out dial and has 0 -10.5 as you turn dial. Is selector motor bad and how do I reach it?

Answer: Probably a mode door or actuator that is not functioning correctly, or broken. The entire dash needs to come out to diagnose and/or replace one of the actuators. I doubt you have a control head problem, so it's either electrical or vacuum related, depending on your system. Either way, a broken or inoperable mode actuator or door would cause this issue. It's a big undertaking to get involved with, so be sure you're comfortable removing nearly all aspects of the dash. A repair manual will help if you can get your hands on one. Once you get access to the mode door, you can try moving it by hand to see if you can change the mode to defrost yourself. If so, you need a new actuator.


2007 GMC Sierra sle 2500. 6.0 L V8.
Question: Blower motor will not run on high have replaced motor and resistor.when turned to 5 on the control you can hear like a relay click under the dash and blower motor stops. it does work on all other speeds . is there a high position fan relay? if so where.

Answer: On a 2007 GMC Sierra, I am showing no relay or different circuit for the high blower on the manual HVAC system. The resistor control all speeds using pulse width modulation signal from the control head. It is possible you have a control head problem. But that would need to be tested with a volt meter and schematic to be sure.

Be Social With Us !

Google Bookmarks


Leave your comments

Post comment as a guest

0 / 300 Character restriction
Your text should be in between 10-300 characters

    Comments (8)

      • Al

        2004 Chevy Silverado blowing hot air through chest vents even when A/C is on. Drivers side only. Any ideas ?<br /><br />Thanks.

      • Rubist56

        In reply to: Al

        2004 Silverado, blowing hot air through chest vents even when a/c is on. driver`s side only. any ideas ?<br /><br />Thanks
        <br />Very common problem with the air temperature door actuator motor on that side.

      • Michel

        Thanks. If the blower motor is drawing to much current should I replace?

      • Tech

        In reply to: Michel

        If it were drawing too much current, yes it would need to be replaced.

      • Michel

        Thanks for your help. I purchased a resistor from Napa for $42.50 plus tax. Did I get ripped off?

      • Tech

        In reply to: Michel

        That sounds about right. Cost from the dealer is about $25-$30 more than that.

      • Michel

        In reply to: Tech

        Good day. I did as you suggested and replaced the resistor. I had all 5 settings on the fan blower switch working for 2 days. I am back to only 4 settings. Also my car starter does not work. Can this be causing my resistor to not work on all 5 settings or is there something else. Thank You for your help. Michel

      • Tech

        In reply to: Michel

        HMMM. If you checked the connector and it is Okay, then the blower motor may be drawing too munch current and burning out the resistor. The starter has nothing to do with the blower motor or resistor.

      Search Us Here...


      How Things Work

      Car and Truck Fuel System Operation

      The fuel tank stores the fuel supply. The electric fuel pump, supplies fuel through an in-line fuel filter to the fuel injection system. The fuel pump provides fuel at a higher rate of flow than is needed by the fuel injection system. The fuel pressure regulator maintains the correct fuel pressure to the fuel injection system. A separate pipe returns unused fuel to the fuel tank.

      Read more...

      Common Engine Codes

      Code P0420 Catalytic Converter Failure

      To control emissions of hydrocarbons (HC), carbon monoxide (CO), and oxides of nitrogen (NOx), a three-way catalytic converter is used. The catalyst within the converter promotes a chemical reaction which oxidizes the HC and CO present in the exhaust gas, converting them into harmless water vapor and carbon dioxide. The catalyst also reduces NOx, converting the NOx to nitrogen.

      Read more...