XPost: alt.home.repair   
   From: xenolith@optusnet.com.au   
      
   On 13/1/2023 11:04 am, micky wrote:   
   >   
   > Doesn't this make their legs hot?   
   >   
   >  From time immemorial and certainly in 1950, a car heater was turned on   
   > and off and the temperature adjusted by a valve in the hose that sent   
   > hot water to the car's heater core under the dash.   
   >   
   > But that meant when you turned on the hot water, it took time heating   
   > the core before the core would radiate heat.  Even the hose leading to   
   > the core probably cooled off the coolant somewhat.   
   >   
   > In the 70's? or 80's or 00's? some designers started sending hot water   
   > to the core all the time and using an air blend door to determine if   
   > cold/room temp air came out of the vents or if warm/hot air did.  Then   
   > it only took 3 or 4 seconds to change the temp of the vent air.   
   >   
   The reason for the design change, and the elimination of the mechanical   
   water valve, was the move to factory AC as standard, in particular -   
   climate control. The delay you speak of is the reason that valve had to   
   go. It was far more practical to adjust temperature with a blend door   
   where temperature change was, for the most part, instantaneous. Couldn't   
   achieve that if you relied on controlling water flow. Getting rid of   
   that water valve was once of the best things that ever happened to car   
   heaters. It was the source of many issues and without it the heater core   
   gets a continuous flush every time the car is driven.   
   >   
   > But what about people who live where it's never cold?   South Florida?   
   > Panama, Ecuador, Hawaii, French Equatorial Africa.   Do the cars there   
   > have a hot heater core only 6 inches from inside legs of the driver and   
   > passenger?   Doesn't that annoy them?   
      
   No because if you live in that climate you use the AC. For that matter,   
   I use my AC summer and winter. Summer for cooling, winter for demisting.   
   Works for me.   
      
   --   
   Xeno   
      
      
   Nothing astonishes Noddy so much as common sense and plain dealing.   
          (with apologies to Ralph Waldo Emerson)   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)