I have noticed on my '94 Civic that as soon as the RPM goes up, the
temperature of the air from the vents goes up. Probably because the
water pump runs faster and circulates the coolant faster. It is not due
to engine heating up, as the increase in air temperature comes within a
second or two of hitting the gas pedal.

Chris Aseltine wrote:
>
> I emailed the dealer regarding what temperature is to be expected, we'll see
> what they say.
>
> In the meantime, today it was 0F. I noticed that when idling, the heater
> temperature was quite cool. Under moderate acceleration, it warmed up some
> almost immediately after I hit the gas. If I mashed the throttle, it got
> quite warm, hot really.
>
> Does that mean anything to anyone?