Earlier today, as I was starting my '95 Geo Prizm, I noticed that
turning the ventilation off almost stalls the engine (the lights dim,
etc.). I could understand the opposite effect. Is this a reason for
concern? I had a problem with the alternator/battery a few months ago.

<n.torrey.pines@gmail.com> wrote in message
news:b5b8304e-da09-412e-8810-a162e7e737f0@z6g2000pre.googlegroups.com...
> Earlier today, as I was starting my '95 Geo Prizm, I noticed that
> turning the ventilation off almost stalls the engine (the lights dim,
> etc.). I could understand the opposite effect. Is this a reason for
> concern? I had a problem with the alternator/battery a few months ago.

With the fan still running, does turning off the air conditioning have the
same effect?

If so, try cleaning the MAF sensor and Idle Air Control valve.
--

Ray O
(correct punctuation to reply)