In most cases you’ll have to remove the glove box to gain access to the actuator.Ī shop manual will also provide the test procedure and wiring diagram for your particular vehicle if you want to test the actuator before replacing it. You’ll need a shop manual to locate the right actuator. The blend door actuators are located right on the heater box behind the dash. Fix actuator causing blows cold one side, hot on other side condition If the controller is bad, neither actuator would change positions. This test also proves out the HVAC controller. The actuator that changes temperature is good, the actuator that doesn’t is bad. So your first step in diagnosing a blows cold one side, hot on other side condition is to operate each temperature control to see which side changes temperature. If the actuator fails, it usually fails in full on or full off. In a dual zone system, you wind up with a blows cold one side, hot on other side condition.īlend and mode door actuators have a feedback position sensor inside to report back to the HVAC controller so it knows that the door has actually moved to the properly position. When that happens, the HVAC system can be stuck on blows cold air or blows hot air. Drivers changed air temperature far more often than they change the mode (defrost, floor heat, dash vents, etc.), so the temperature actuators generally fail first. So manufacturers switched to small electric motors called actuator to vary the blend/air mix door positions. Cables would bind and stick, causing all kinds of problems. Faulty blend actuator is most commonĬar makers used to rely on cables to change the position of the blend door to regulate the amount of heat. This situation can be caused by a bad blend door (also called air mix) actuator, a broken or binding blend/air mix door, broken linkage to the blend/air mix door, or a faulty HVAC control head or wiring harness. In a vehicle with dual temperature controls you may encounter a situation where the vent blows cold one side, hot on other side or vice versa. Repair Topics > Heating system and Blower > Vent blows cold one side, hot on other side Vent blows cold one side, hot on other side Diagnose and fix blows cold one side, hot on other side
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