Fan speed 3 uses a contact inside of the A/C relay, in the rear.

Mark

Dan N wrote:
> hi all,
>
> the AC blower fan works only on speed 1,2 and 4 no 3. I change the fan
> blower switch but it's still the same. It's a '89 tintop with rear blower
> and AC duct.
> Could you please what, where to look next..
>
> many thanks
>
> dan
>