With the ambient temp at 90 degrees, I run about 180 on my temp gage. I have a tru-cool 28K cooler and am considering adding a pusher fan to it so that i will keep my temps low in traffic....stop and go stuff. Don't have a problem on the highway, but when you are not moving your temps will go up. I tow a fifth wheel 36ft Prowler right at 15,000K loaded. i have ride rite air bags.