changed (to 40/60) when I found that 20/80 would be very problematic even at SoCal temps in the winter (up at 5000+ feet).
Re-read this thread, second page, bottom of page: Water Wetter compatible?
Also re-read my web page, #15 toward bottom of page.
Anyway, my main point was that I think you car is operating normally. Don't think that changing the ratio will make it any cooler or hotter but will give better corrosion protection as well as increased boil/freeze points.
[Edited by JimF on 07-25-2001 at 08:16 PM]