Bill: Before you do anything I would bypass that filter with a regular hose. If it is stopped up it could be causing your issues. Steve B. On Tue, 14 May 2002 05:05:50 EDT Imperial59crown@xxxxxxx wrote: Today was the first really hot day of the season here in Southern California, with the mercury exceeding 90 degrees, and I decided it would be a good test for the Imperial for the months yet to come. I decided to take it to work and see how good the cooling system was really working. My drive to work is about 20 miles, mostly freeway driving. I started out and the temperature was staying around 160 degrees for about half the trip, but then steadily started climbing to 190 degrees, where it stayed until I exited the freeway and took surface streets for the final three or so miles. While at stoplights I noticed temperatures going up to 200 degrees, and by the time I got to work the temperature was around 210 degrees while stopped. On the way home tonight temperature stayed at 160 most of the way, climbing to 190 by the time I was exiting the freeway, and staying there till I reached home. My question is, is it normal for these types of fluctuations in hot weather? I was getting a little uneasy when temps started soaring to 210. I am seriously considering taking the car to a radiator shop to have it routed out. Bill '59 Crown