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I want to locate thermostat inside house rather than in return air duct. what connections are available?

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  • dsaxon169 May 19, 2011

    Thanks. The reason to I want to make the change is the return air ducts are in the wrong place to get a good sampling of the air. The result is that the areas we want controlled either gets continually hotter or colder (on either heating or cooling cycles). The thermostat is functional according to service people.



    All sevicemen admit the return air is badly located (in a hallway) but all are reluctant to make any changes. I did ask one service company to place a thermostat inside the house, but he ummed and aahed so much I got the message that he didn't really want to do the job. so..



    The outside unit is an Hitatachi Utopia, model EAS5HQE5, the roof unit is a Roberstson something.



    I know that to place a thermostat inside the room would negate measuring the average air, but with some trial and error I ought to be able to find a reasonable compromise position. That's what I am willing to try.

    Does this help?

  • dsaxon169 May 20, 2011

    It's in the realm of what I thought he might say. So OK.

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Hi,
To be able to help you we will need to know much more about what type of a system you have and what equipment you have.
The existing thermostat probably will not be able to be used, you will need to buy a new t-stat...also the t-stat will then only be sampling the temperature of the space it is in and not getting a mixed or average temperature sampling. Therefore you could be getting into other issues by moving it.

Please comment back and I will try to guide you through what you can do...

heatman101

Posted on May 19, 2011

  • D. Floyd Kolb
    D. Floyd Kolb May 19, 2011

    What you are saying makes sense...do you know if the t-stat uses a sensor or if it has a probe that sticks into the ductwork?
    The other problem, will be getting the wiring to the new location...you will need to open the existing t-stat and find out how many wires are going to it.
    Then find out where the wires are running to...then you will have to figure out how to get the wiring to the spot where you would like to locate the t-stat...
    Once you have that done then you can mark all of the wires and then relocate the t-stat or install a new one if needed...

    heatman101

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How do i put in a thermostat in 1999 cadillac deville


DeVille, Eldorado, Seville 1999-2005

Removal & Installation

Print

  1. Disconnect the negative battery cable.
  2. Drain the coolant.
  3. Remove the air intake duct.
  4. Disconnect the radiator hose
  5. Remove the thermostat housing.
  6. Remove the thermostat.
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    0996b43f802054d6.jpg enlarge_icon.gifenlarge_tooltip.gif

    Fig. Thermostat and housing-typical


To install:
  1. Install the thermostat.
  2. Install the thermostat housing using a new gasket.
  3. Install the thermostat housing bolts and tighten as follows:
    1. 1999 models: 15 ft. lbs. (20 Nm)
    2. 2000-05 models: 89 inch lbs. (10 Nm).

  4. Connect the radiator hose.
  5. Install the air intake duct.
  6. Refill the coolant.
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  8. Start the engine and check for leaks.

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If there is no airflow out of the register then the supply duct to that register is disconnected, blocked, or crushed. Go in attic or basement or crawl space and check the supply duct to this register and it should be visually apparent what the problem. Since i don't know where your air handler is located, i don't know where your ductwork is located(hence the attic, basement, or crawl space). There is one other possibility, if you find your supply duct is intact from the main trunk to your supply boot, then you may have a collar with a damper where the supply duct is connected to the main trunk duct and the baffle may be closed. If the tab handle on the baffled collar is in line with the supply duct then it is open. If perpendicular to the supply duct it is fully closed.
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replacing the thermostst involves.
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  2. Remove or disconnect the following:
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Thermostat housing-4.8L, 5.3L and 6.0L engines


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1 Answer

Keeps over heating, has water and coolant not sure where the thermostat is located because i don't have the manual. oil has been added but i dont have any other clues besides the water pump. Any advice?


Thermostat
Removal & Installation
To Remove:


  1. Before servicing the vehicle refer to the precautions at the beginning of
    this section.

  2. Partially drain the coolant, (until the level is below the thermostat).
  3. Remove or disconnect the following:

    • The air cleaner and duct assembly
    • The crossover exhaust pipe
    • The radiator hose from the thermostat housing
    • The thermostat housing bolts
    • Any remaining sealer from the bolt threads






      gm_mv_ven_tstat.gif



    • The thermostat housing
    • The gasket
    • The thermostat

To Install:


  1. Install or connect the following:

    • The thermostat
    • The thermostat housing
    • The gasket
      NOTE: Apply RTV sealer, GM P/N 1052366 or the equivalent, to the
      thermostat housing bolt threads.

    • The thermostat housing bolts

      1. Torque to: 18 ft. lbs. (25 Nm)

    • The radiator hose to the thermostat housing
    • The crossover exhaust pipe
    • The air cleaner and duct assembly
    • The coolant

  2. Thoroughly inspect the cooling system for leaks.


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