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the blend door is jammed.

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12y ago

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When the automatic temperature control is not maintaining the preset temperature A mechanical noise is heard in the area of the blend door What is the most likely cause?

The blend door is jammed


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[From the Merriam Webster dictionary] thermostat: an automatic device for regulating temperature A senses the room temperature and controls the HVAC system according to a schedule established by the homeowner. This type of thermostat allows different temperature settings to automatically regulate the HVAC system at different preset times.


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What can cause the automatic temperature control to not maintain the preset temperature and a noise in the area of the blend door?

There is a little white box, with a small plastic gear that opens and closes the blend door. The box also has temp control sensors that connect to the dash controls. The small plastic gear is stripped out, and will not close the door or moderate temp. Behind the large plastic piece under the ashtray. (Blend door actuator, XF2H-19E616-FA-R247-B19791- MAN Part #604203/$50.59 Advance Auto.) dan.manning@yahoo.com


What a control system?

A furnace by definition provides heat. There must be something that controls that heat; that is that tells the furnace when to fire up the burners and when to shut down the burners. This function is provided by the furnace control system. Usually the control system itself is controlled by a thermostat which maintains the temperature at a preset level on the thermostat.


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Aquastats are thermostats sensing the temperature of the water itself, and are used basically to stop and start the burner by controlling the electrical circuit. The temperature of the water is held within preset limits by the aquastats. As the temperature of the water drops to the low setting, the aquastat closes a contact and starts the burner. When the temperature reaches the high setting, the aquastat opens the contact and stops the burner. There is usually a high limit setting which will open the contact, if it should fail to open on the automatic HI/LO control. This feature can be contained within the same instrument or it might be a separate unit. What temperature should the aquastat be set at for the boiler?


What is a furnace control system?

A furnace by definition provides heat. There must be something that controls that heat; that is that tells the furnace when to fire up the burners and when to shut down the burners. This function is provided by the furnace control system. Usually the control system itself is controlled by a thermostat which maintains the temperature at a preset level on the thermostat.


1987 Jeep Wrangler with a 4.2 automatic that runs at about 210 degrees what is the normal operating temperature and what can I do to get there?

The thermostat controls operating temperature. This occurs at a preset temperature (typically 195 degrees F. or so), which is usually stamped on the thermostat itself. The thermostat should be fully open about 20 degrees F. above the rated temperature. So your operating temperature is about right. If you have doubts, just replace the thermostat with a new one of the correct temp.


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