Question about Ruud Central System Air Conditioner

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It will not heat unless on emegency heat or it will not cool, but fan will work. What is the problem?

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Sounds like low on freon.

Posted on Mar 21, 2011

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To turn on the air conditioner, on the thermostat do you click it to Auto and then on the other side click to Cool? Or do you click on Fan and Cool?


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No heat for me and my daughter 201 ford taurs everything you can think of has been done to this car please help


i hate no heat. ford taurus 2001 are a problem sometimes with heat issues.on the firewall there are heater hoses that get clogged,pinched,and sometimes it's just a bad heater core. you said everything you can think of has been done?[replaced heater core? flushed the radiator? are the cooling fans coming on? is radiator full of coolant? have you took the cap off to be sure?like i said,i hate no heat. i'm still thinking.thermostat new?the blower works but only blows cold air?ok if thermostats good,radiator is full,blower works,radiators full,cooling fans coming on, no engine overheating but temperature is fine,let's do this for a short winter time solution only!in the front of your car with the hood up.look at the radiator,ok,in front of the radiator,place a peice of cardboard in front of radiator on the bumper side. think i'm crazy right? try this. cut just a small peice of cardboard about half the size of the radiator and insert it in FRONT BUMPER SIDE of the radiator, this will give you emegency heat,it will have to come out when the temperature outside warms up because it will make your car overheat.for sure.but in cold weather,it's a sure thing to bring the heat up inside the car. you are restricting the air that flows through your radiator while the cars moving down the road,do not let car idle as it will heat up,as long as you're moving you will be safe,keep an eye on your temp. guage as you may have to make an adjustment to the size of the cardboard. yep i was a truck driver for many years and know so well how cold the road is. i kept my cardboard handy in the winter and never got cold. you do have an existing problem with your heat,and unless you deal with it soon,you'll need those cardboard boxes and duct tape for a minute.if you don't beleive me,try it.you'll be toasty in no time,just watch that temp guage and you'll be fine. thank you for choosing fixya.com and by the way,let me know how it works for you,i love to hear that i've assisted someone,somewhere.

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1 Answer

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I need help with my central heat and air unit, it has a heat pump. the model number is GQ3RA-036K. I am changing the theromstat out and the wires are connected to it. there are eight wire colors that are...


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Please note. Not all installers use the proper color codes when they install or replace equipment. It may be necessary go go to the furnace or outdoor unit to verify what wires are for what purpose. Also be sure there are no splices in the wire that could change the wire colors between components.
  • R (red) or Rh (Red heat) 24 volts from equipment.
  • Rc (Red cooling) 24 volts from transformer in cooling equipment.
Note: If only furnace has a transformer and cooling equipment does not jumper Rc and Rh.
  • W (White) sends 24 volts to furnace control to start the heating cycle.
  • W2 (no standardized wire color, usually whatever wire color is available) controls second stage heat.
Note: W2 is most often used for heat pumps to control what is called emegency heat or Auxillary heat, and most often will use the white wire.
  • Y (yellow) often (blue) is used, controls cooling unit (outdoor condensing unit) also is used for heat pump heat.
  • Y2 (no standardized wire color, usually whatever wire color is available) controls second stage cooling.
  • G (Green) controls the fan "on" operation of the furnace/air handler. Also often is used to start the blower for many electric furnaces.
  • C (common) most often brown but can also be black or other color available to installer.
  • O (orange) Energizes heat pump reversing valve for cooling (Trane and most other brands).
  • B (Blue) Energizes heat pump reversing valve for heating (Rheem, Ruud and Weatherking).

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Have a coleman 5640 heating/cooling unit and the motor won't run unless just a tiny amount of pressure added?? Any suggestions?


Yes, to change from heat to cool is done by reversing the power plug that is close to the housing. Matching the blue on the plug(as I recall) makes it cool. The red to blue makes it a heater. If it is currently heating, the unit works fine, it just needs the polarity reversed.
Good luck,
Glenn

May 04, 2008 | Heating & Cooling

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