Actually, yes there is electricity in a car AC system. The clutch on the
compressor takes electricity. There are often controls which turn the clutch
off and on, which are electric. My GM vehicle has an electric low pressure
cutout switch for the suction side.

--

Christopher A. Young
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"greywolf42" wrote in message
...


2. Use AC for car in a hot summer day
Temperature outside = 80F,
Temp of a car parked in sun for one hour = very hot, don't know
exact temp

After getting into the car
Method A: open windows, drive for a moment then close the windows
and start AC. - mine
Method B: Start AC right away without opening windows. - wife's

Question: which one make car temp drop faster and which one costs
less electricity?

Method A here will cool the air inside the car faster. But the main source
of heat in the car is not the air, but the roof, seats, floor, windows and
dashboard. They've all been heated to uncomfortable levels, and the heat
capacity of the air is minimal, compared to the rest.

Once the air has been blown out (which will take about 2 seconds), you can
safely close the windows.

There is no electricity in a car AC system (except in an electric car)...
the AC compressor runs off of an engine belt.

--
greywolf42
ubi dubium ibi libertas
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