when i turn the heat selector on the ac runs also whats going on here?

315

Asked by Mar 03, 2014 at 08:54 PM about the 1968 Ford Thunderbird

Question type: Maintenance & Repair

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

3 Answers

102,405

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.

1 of 1 people found this helpful.
71,025

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

1 of 1 people found this helpful.
3,865

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.

2 of 2 people found this helpful.

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