If the AC compressor is engaging it could be the heater control valve is stuck open. If the AC compressor is NOT engaging you probably have a problem with the controls, a sensor or the compressor.
A contour chart is a map that shows contour lines. A good example of this is a topographic map.
The land is steep if the contour lines are close together
topographic maps
A contour interval shows a change in elevation on a topographical map. If the contour interval is 20 then the elevation change between two contour lines is 20 meters
a TOPOGRAPHICAL MAP shows the contour of the lines
contour lines
The outside air temperature should still have the same reading. The installed sending unit should not affect the temperature gauge.
shows the elevation above sea level.
When contour lines are close together the land is steep
Closely spaced contour line on a topographic map shows that the land is steep.
topographic map
elevation above mean sea level