Turning the revs down also proportionally slows the cooling fan so it wont be running much cooler if any - also both engines are designed to run at an optimum 3600 rpm which by no coincidence am sure is the same optimum rpm for the roots 33 blower fitted to both models - so turning down revs will also give less blower effect = less suction also I think could possibly even cause hotspots within the blower? JK will be able to advise more accurately. This particular blower is around 1200usd without shipping etc. and looks very easy to change out on both models - that said - the blower has been seriously tested for 3 years (with waste water running thru it) and properly certificated by some authority in that industry..I lower temp (for light soiled upholstery usually) by just cracking the main bypass valve - it isnt an exact science - but you soon develop "the knack" so would conclude that the prowler doesnt have a dedicated temp control tho it can be lowered after a fashion.Stu