XPost: alt.home.repair

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.


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?

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XPost: alt.home.repair

On 1/12/2023 7:04 PM, 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.

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?

Not sure if it circulates all the time or not. My present car I bought
in October of 2017. I set the temperature to be 72. I've lived where
is was a bit below zero and as high as 98 and baking in the sun. Once
the car runs a bit, I'm comfortable. In extremes, I use the remote
starter to heat/cool a bit before I drive.

In really cold weather, the heated steering wheel is nice too.

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XPost: alt.home.repair

On Thu, 12 Jan 2023 19:04:17 -0500, micky <[email protected]>
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.

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?

I've never seen or owned a car like you described, so my answer to your
final question is "No."

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XPost: alt.home.repair

In alt.home.repair, on Thu, 12 Jan 2023 22:03:34 -0600, Jim Joyce <[email protected]d> wrote:

On Thu, 12 Jan 2023 19:04:17 -0500, micky <[email protected]>
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.


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?

I've never seen or owned a car like you described, so my answer to your
final question is "No."

Well I checked just now, and Camrys aren't the only ones.

https://bobistheoilguy.com/forums/threads/does-coolant-flow-through-the-heater-core-all-the-time.300744/
Follow your heater hoses, if there is a control valve in one of the
hoses it does not flow all the time. No heater control valve...then it
flows all the time through the heater core.
--
Exactly. In virtually every modern car coolant circulates through the
heater core 100% of the time- interior air temperature is set by one or
more blend doors in the HVAC ducting.
--
^This! If it doesn't have what was commonly referred to as a Ranco valve
you can fit one easily, it will improve A/C performance on older cars
that may have a leaky blend door and save undue stress on the heater
core in the summer. Many types are available manual, vacuum and electric
some even with a rheostat.
--
Hmm... I wonder if lack of a shut-off valve, a leaky blend door, or some
other form of heat leakage might be why my Prius blows warmer than
outdoor air when heat and AC are both supposed to be off. It's very
annoying in mild weather. My brother has the same complaint with his '95 Avalon. My Mazda had a proper coolant shut-off valve AND blend-door
temperature control.


�
I will have to look into a Ranco valve. ... Ranco makes lots of really complicated valves. This is just a check valve: https://www.robertshaw.com/Products/Transportation/Coolant-Control-Valves/H43/?cat=2147484363
This is more stuff but not what the guy above is talking about. https://www.robertshaw.com/Products/Listing/?filter=2147484362&categories=2147484363
Although the first 3 pages above just show different versions of the
same thing. For a little of everything, page 4 is the place: https://www.robertshaw.com/Products/Listing/?filter=2147484362&categories=2147484363&page=4&isDiscontinued=false
He might have in mind the H42-valve. This is for several differnt
models: https://www.robertshaw.com/Products/Transportation/Coolant-Control-Valves/H42-Valve/?cat=2147484363

Since I don't need one, I'm not looking any further. The way to find
out would be to ask a mechanic or at an auto-parts store.


BTW, I see that the Ranco valve is not what I once wanted, something
unrelated to this thread, that would, for the winter, turn the heater
fan off until the coolant�warmed up, so it wouldn't blow cold air on me.
But this car warms up quicker than some earlier ones so it's not so
important. (Ranco valves limit or stop the water flow, usually in the
summer, not the fan.) I did put a thermostatic switch for the fan in
my heater hose once, but I can't remember what happened after that.


Some, maybe most heater cores may be farther from one's legs than the
Camry, but an advantage of Camry is that it's pretty easy to change a
Camry's leaking core because it's so accessible.

�

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XPost: alt.home.repair

On 1/12/2023 19:04, micky wrote:

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.

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?

Until the 60's, everything was an option... even a heater was an option
in some cars. It's been standard in all cars for a long time, and I
imagine that carpeting and modern insulation take care of the issues
with the heater core which you are suggesting.

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XPost: alt.home.repair

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)

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XPost: alt.home.repair

On 1/27/23 7:00 PM, Xeno wrote:

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.

THANK YOU! It seemed insane to heat/cool the car by ALWAYS using a
combination of hot/cold air. I first noticed this on my mom's 1988
Caddy, but I figured that insanity was the norm for Cadillac.

--
Cheers,Bev
"It is a matter of regret that many low, mean suspicions
turn out to be well-founded." -- Edgar Watson Howe

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