I think my car has become acustomed to idling happily with the heat on floor at fan speed 3. How to i get it the pcm to forget that and idle the same way with the fan off.

thanks for the help

 

There should be no change in idle from what you describe. Only if the a/c compressor was engaged should the idle be much affected.

If you want to try to reset the IAC, do this:

-Depress accelerator slightly

-Start engine, then release accelerator pedal, run engine for 5 seconds

-Turn ignition "OFF" for ten seconds

-Restart engine and check for proper idle operation

 

Thanks for the help.