The breather thing is a heater to help prevent icing. It gets power
when the ignition is on.

-Simon

On Jun 14, 2004, at 8:38 PM, Mark Seifert wrote:

> I have an 86, with some kind of sensor thing that attatches to the
> crankcase
> breather hose, with a 2-wire connector on it. The part number is 025
> 906
> 391A. What is this thing? Also, can the intake air temp sensor be
> replaced
> without replacing the entire air flow meter? Thanks.