Question about Chevrolet Equinox

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Engine temp OK - heat control on dash has no effect on temp - blows same temp air no matter where the dial is - antifreeze OK - blower OK

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  • Chevrolet Master
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Hi, the likely problem is a failed blend door cable or actuator, but I will need your model and year to provide specific repair advice, please.

Posted on Apr 04, 2011

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  • Jeff Turcotte
    Jeff Turcotte Apr 04, 2011

    Well, I don't have a real good picture of the Equinox blend door. The HVAC box is shown below, and the heater core is installed under the cover on the left. There is an actuator above and to the right, but I think that's the vent or defrost actuator. The blend door actuator may be on the other side and looks more like the picture below. You may have to remove a sound barrier to look up there under the dash, and I'm not sure what else might be in the way. What you want to do is to see if the actuator is turning (the little white axle inside) when you change the temperature setting. It may have stripped it's gears, or the door may be broken inside. Take the actuator off and plug it back in to see if it turns when off the box. If it does, the problem is more likely inside the box, unless the actuator does not turn when you apply resistance with your fingers. I will try to find a better picture for you.


  • Jeff Turcotte
    Jeff Turcotte Apr 04, 2011

    While looking for pic, I found a thread on the blend door problems. Apparently a lot of the doors are falling apart inside the box. That repair requires the dash to come apart and the whole heater box to be removed from the car. Ouch: http://www.topix.com/forum/autos/chevrol...

    Hope your problem is just the actuator. If not, I do have the instructions for removing the box. They aren't pretty though.

  • Jeff Turcotte
    Jeff Turcotte Apr 04, 2011

    Here is the actuator in the middle on the other side. I found this pic in the middle of an excellent post where a guy had the broken door and did it all himself. You will want to study this post carefully before going any farther: http://www.handymanlyness.com/archives/a...




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1998 gmc surburban. front blows 82 degrees, rear blows 48 degrees. ambient is 91 degrees. this is with max-recirc-full tilt.the valve for the heater core does not change position no matter where i put the...


Hi John,
Your right with your diagnostics, you have a blend door problem. If your switching to cool air and it is still hot then you also have a heat exchange unit fault, this is the component that changes the water flow from hot to cool by shutting off. If it is not operating correctly this will give you constant hot air no matter where you temperature switch is positioned.
As for the warm air while the engine is cold, sounds like the blend door is still open to atmosphere tempreture and if it is hot outside will pull that hot air into the inside of the vehicle.
Have the heat exchange valve checked, and the only way the check blend door operation is to remove the wiring from the blend doors and have the circuit tested. If the circuit is ok then the blend doors will need to be replaced.
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You also have a heater valve that allows the heated coolant to enter the passenger compartment into a heater core (small radiator to allow heat to transfer into the air when the blower blows air across the core) - this can also be vacuum controlled or cable controlled or electronically controlled - if it malfunctions then you may not get any heat into the passenger compartment - you will have to determine if the valve is not getting the signal to open or is bad and will not open - good luck :O)

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Please take a moment to rate my answer..............Thanks

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