A/C Thermostat switch question

[Mountaineerfan 34]

I don’t think my clutch is cycling off, causing some freezing up issues. Is there a way to check/replace the switch without removing the dash? If so, does anyone have a picture showing the location? Can I get to it behind the glove box? If a wire is loose, would the clutch still run?

Thanks in advance!

[aslanefe 268]

3 hours ago, Mountaineerfan said:

I don’t think my clutch is cycling off, causing some freezing up issues. Is there a way to check/replace the switch without removing the dash? If so, does anyone have a picture showing the location? Can I get to it behind the glove box? If a wire is loose, would the clutch still run?

Thanks in advance!

Look at this thread. You can see the switch in the video and the photo.

[Mountaineerfan 34]

Thanks! 

[Mountaineerfan 34]

So I removed the glove box door. And discovered the blend door actuator motor did not have the vacuum line attached to it. I reattached the line, started the car and tested that it would move, which it did. So now I’ll wait until tomorrow afternoon and drive with it to see if that helps any! I’m thinking with the blend door not moving, the heater core was keeping the box warm and the thermostat would never kick off. Hoping it was a quick cheap fix!

[nymustang1969 19]

The blend door is operated by the cable on the control panel, not vacuum.

[Mountaineerfan 34]

So then what is this actuator for that engages and moves when put on cold and disengages on warm? The cable moves an arm that is hitting the plunger on the servo (granted, it could move a door inside as well). 

[aslanefe 268]

1 hour ago, Mountaineerfan said:

So then what is this actuator for that engages and moves when put on cold and disengages on warm? The cable moves an arm that is hitting the plunger on the servo (granted, it could move a door inside as well). 

It has 2 blend doors, kind of. Vacuum actuator operates one, cable operates the other. You need to open up a unit to understand how the 2 doors work together.

[det0326 130]

That vacuum switch operates the heater coolant control valve in the engine bay on passenger side. Its job is to cut off coolant going to heater when in A/C mode. 

[aslanefe 268]

2 hours ago, det0326 said:

That vacuum switch operates the heater coolant control valve in the engine bay on passenger side. Its job is to cut off coolant going to heater when in A/C mode. 

If my memory serves me right, the switch also activates the vacuum actuator on the first photo. So when switch is pressed by the lever of blend door 1" (activated  by the cable of hot-cold lever) the heater control valve closes and stops hot coolant going into the heater core. And at the same time the vacuum actuator closes the "blend door 2" and eliminates the air going "through" the heater core.

[det0326 130]

3 hours ago, aslanefe said:

If my memory serves me right, the switch also activates the vacuum actuator on the first photo. So when switch is pressed by the lever of blend door 1" (activated  by the cable of hot-cold lever) the heater control valve closes and stops hot coolant going into the heater core. And at the same time the vacuum actuator closes the "blend door 2" and eliminates the air going "through" the heater core.

yes u maybe right I remember hooking mine up from a dia. I found but that has been several years ago. My memory doesn't serve me as well anymore.  I was thinking tho that the door u speak of is operated at the same time but happens before the water coolant switch. The coolant switch is a branch off the line that operates the door.