when i turn the heat selector on the ac runs also whats going on here?
1968 ford thunderbird,climate controlled temps.i move the selector to 76 degrees ,the ac
turns on as well.air blows fine ,something is not telling the ac to turn off
The system is trying to maintain the 76 degrees you have it set at, so the A/C will cycle on and off. If you set the heat to max heat that should shut off the A/C compressor.
On an automatic climate control system, even from the '60s, the A/C compressor will run any time the outside temperature is about 35°F or higher. This is normal. The system does this to keep humidity levels down inside the car so your windows won't fog up in cool damp weather. HTH. -Jim
Thunderbird ATC systems lacked the economy/vent option until 71-2 and the 6th generation. This was the only way to deactivate the compressor above freezing ambient temps. In all other active settings the cabin sensors would cycle the compressor intermittently.
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