hi art b , heck, bend and uncle yount- guess im lucky when i move the lever all the way to the left, the dash vents blow cold in about a minute. interesting when we have a rare cold florida morning , i get heat within 2 minutes after levering right and rolling. one followup art b, moe never told me how much to drink at one sitting- guessing two small shot glasses? had almost 50 years on rwd fords and slant sixes, so not a novice there .240s are a steeper learning curve but my bruthas and muthas here on the board greatly help with enigmas. thanks tons again oldduke ps and btw did put at least 3 turn valve petcocks on fords and dodges to shut off the trickle of hot water into the heater core. many of the american tanks of yesteryear had these vacuum actuated shut off valve pods which were stinko after maybe two years . a real pain in the keester when you had a 98 degree day at the jersey shore.