Q: Blend door

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My blend door actuator is bad. If I were to place valves on coolant lines going to heater coil, would this allow the AC to cool the car when they are closed?

No. The blend door actuator changes air to flow over the heater core or the evaporator and in between. If the actuator is stuck in one position toward heat, then you may not get heat but only fresh air moving around.

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