It has full Climate control. Air conditioning appears to be working.
If I have the system in full-auto mode window will fog up within about
20 minutes. I then have to put the defrost on. After defrosted I can
turn it back to full-auto for a while. I don't think I had to do this
before. Essentially before once the window was defrosted I could leave
it on full-auto and window wouldn't fog up again.

Woody wrote:
> It sounds more like you still have air in the system. Was the correct
> procedure used to purge air from the engine when the anti-freeze was
> replaced? Did mechanic check engine temperature with an OBDII tester? This
> will check whether thermostat is controlling engine temperature. Do you have
> climate control or an LX with basic heating system? Is air conditioning
> working? Air conditioning needs to work to dry air which clears windshield.
> If it is not working the warm moist air will take forever to clear
> windshield.
>
>
> "Richard Koop" <rjkoop@gmail.com> wrote in message
> news:1136894629.872262.37790@o13g2000cwo.googlegro ups.com...
> >I have a 2002 Honda Odyssey. Generally runs great but recently haven't
> > been able to get much heat out of the vents even when I set the temp to
> > 28 degrees C. It also takes forever to defrost the windshield.
> > Recently, when I start up the van and it's idling, I can smell a faint
> > gas/oil smell coming from the vents which I never smelt before. It
> > goes away after I drive away though.
> >
> > My mechanic thinks it's the thermostat so I'll get that replaced first
> > I guess. Coolant was recently replaced and it's topped up. Also cabin
> > filter was replaced. Temperature gauge on the dash says that the car
> > is in the normal operating temperature range. Could these be the
> > symptoms of something else other than the thermostat?
> >