When i turn my heater or my air conditioner In my 2000 Civic SI i only have two different speeds.....The only speeds i have are the last two on the highest setting any idea what might be wrong

 

Your power MOSFET that runs the blower motor took a ****. It works the same way as a blower resistor, just with more speeds.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by King V &raquo;</TD></TR><TR><TD CLASS="quote">Your power MOSFET that runs the blower motor took a ****. It works the same way as a blower resistor, just with more speeds.</TD></TR></TABLE>

Is that something that i could replace? Or do you think a shop needs to do it Thanks

 

The power transistor is probably bad.

 

its the power transisotr thats bad....yes u can replace it by yourself

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by duneracer69 &raquo;</TD></TR><TR><TD CLASS="quote">

Is that something that i could replace? Or do you think a shop needs to do it Thanks </TD></TR></TABLE>

Yes. I would get one from a Honda dealer just to guarantee compatibility. It should be next to the blower motor itself.

 

i replaced the power transitor and it didnt fix it heres my next question when i unpluged the transistor it didnt do anything the blower motor still blew only on the 2 highest settings....should it even blow at all if that part is unpluged??

 

Not sure if the blower should work without the transistor.

Here's two troubleshooting diagrams:

 

Where did you get those blueprints?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by deh4567 &raquo;</TD></TR><TR><TD CLASS="quote">Where did you get those blueprints? </TD></TR></TABLE>

http://hondatech.info/downloads/Auto/Manuals/Civic/