Under most circumstances, a bad thermostat will not have any effect whatsoever on the air conditioning system. The AC system is a completely separate entity; the only connection it has to the engine is at the compressor pulley, which derives its power from the crankshaft.

Can thermostat cause AC not to cool?

Uneven cooling: If the thermostat is either miscalibrated or has a faulty connection to the AC, it can mean the air conditioner wonb t run long enough to distribute cooling evenly around a home.

What are the symptoms of a bad AC thermostat?

• Your HVAC Keeps Turning On or Off. …
• Faulty Thermostat Readings. …
• Suspiciously High Energy Bills. …
• Constant Temperature Shifts. …
• Thermostat Is Too Old. …
• Thermostat Fails to Respond to Changed Settings. …
• Your HVAC System Short Cycles.