burlmart wrote:
do you ever use idling engine w/ dash AC?
Yes ... once in awhile.
We sometimes do it after shopping close to lunchtime in shopping centers on hot days. We'll relax in cool comfort with a lunch at the dinette, while keeping the outside noise down by using the dash air and idling the V10 engine. We used BOTH the dash air and roof air once in the Texas Panhandle in August after coming inside from extreme outside temperatures - to keep from getting heat stroke.
We like flexibility in the choices we have after spending the money for a self-contained RV ... so we look for all possible ways to use it's equipment and capabilites.
We've never come close to over-heating the big engine that we know of. We run the dash A/C on any setting needed up long grades in any outside temperatures - including going into and out of Death Valley on some of those long pulls. However we do not tow and we have only a small Class C on the optional E450 chassis, which may have improved cooling over the E350 chassis - but I'm not sure on this chassis difference. The higher gear ratio of the E450's differential does allow the V10 to spin a bit faster though, which may help with cooling on grades.