Question about 2000 Ford Expedition

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Rear heater core is hot in and out the condersor is cold

Rear heater core is hot in and out of hoses, the condensor is cold so when the fan blows it blows cold are onto the heater core making the air coming out cold

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It is pluged. That is why you have cold air blowing. If it is possible take the heart core out and drain all the anti frezze out you can. Fluch it out with water as much as possible. Put some water into one side of it and see if it comes out the other. If not add about a half cup of draino in it and let it set for about 10 min. If water runs threw it ya got it if not add some more untill you get the water to flow through it freely. Reinstall and you should be fine.

Posted on Dec 02, 2012

6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

vmhreha
  • 77 Answers

SOURCE: air condition/heater

sounds like the air-conditioning expansion valve is probably not working correctly here is a way you can fix your air conditioning:

  1. Realize that auto AC is basically a refrigerator in a weird layout. It's designed to move heat from one place (the inside of your car) to some other place (the outdoors). While a complete discussion of every specific model and component is well outside the scope of this article, this should give you a start on figuring out what the problem might be and either fixing it yourself or talking intelligently to someone you can pay to fix it.
  1. Become familiar with the major components to auto air conditioning:

  2. the compressor, which compresses and circulates the refrigerant in the system
  • the refrigerant, (on modern cars, usually a substance called R-134a older cars have r-12 freon which is becoming increasingly more expensive and hard to find, and also requires a license to handle) which carries the heat
  • the condenser, which changes the phase of the refrigerant and expels heat removed from the car
  • the expansion valve (or orifice tube in some vehicles), which is somewhat of a nozzle and functions to similtaneously drop the pressure of the refrigerant liquid, meter its flow, and atomize it
  • the evaporator, which transfers heat to the refrigerant from the air blown across it, cooling your car
  • the receiver/dryer, which functions as a filter for the refrigerant/oil, removing moisture and other contaminants
  1. Understand the air conditioning process: The compressor puts the refrigerant under pressure and sends it to the condensing coils. In your car, these coils are generally in front of the radiator. Compressing a gas makes it quite hot. In the condenser, this added heat and the heat the refrigerant picked up in the evaporator is expelled to the air flowing across it from outside the car. When the refrigerant is cooled to its saturation temperature, it will change phase from a gas back into a liquid (this gives off a bundle of heat known as the "latent heat of vaporization"). The liquid then passes through the expansion valve to the evaporator, the coils inside of your car, where it loses pressure that was added to it in the compressor. This causes some of the liquid to change to a low-pressure gas as it cools the remaining liquid. This two-phase mixture enters the evaporator, and the liquid portion of the refrigerant absorbs the heat from the air across the coil and evaporates. Your car's blower circulates air across the cold evaporator and into the interior. The refrigerant goes back through the cycle again and again.
  2. Check to see if all the R-134a leaks out (meaning there's nothing in the loop to carry away heat). Leaks are easy to spot but not easy to fix without pulling things apart. Most auto-supply stores carry a fluorescent dye that can be added to the system to check for leaks, and it will have instructions for use on the can. If there's a bad enough leak, the system will have no pressure in it at all. Find one of the valve-stem-looking things and CAREFULLY (eye protection recommended) poke a pen in there to try to valve off pressure, and if there IS none, that's the problem.
  3. Make sure the compressor is turning. Start the car, turn on the AC and look under the hood. The AC compressor is generally a pumplike thing off to one side with large rubber and steel hoses going to it. It will not have a filler cap on it, but will often have one or two things that look like the valve stems on a bike tire. The pulley on the front of the compressor exists as an outer pulley and an inner hub which turns when an electric clutch is engaged. If the AC is on and the blower is on, but the center of the pulley is not turning, then the compressor's clutch is not engaging. This could be a bad fuse, a wiring problem, a broken AC switch in your dash, or the system could be low on refrigerant (most systems have a low-pressure safety cutout that will disable the compressor if there isn't enough refrigerant in the system).
  4. Look for other things that can go wrong: bad switches, bad fuses, broken wires, broken fan belt (preventing the pump from turning), or seal failure inside the compressor.
  5. Feel for any cooling at all. If the system cools, but not much, it could just be low pressure, and you can top up the refrigerant. Most auto-supply stores will have a kit to refill a system, and it will come with instructions. Do not overfill! Adding more than the recommended amount of refrigerant will NOT improve performance but actually will decrease performance. In fact, the more expensive automated equipment found at nicer shops actually monitors cooling performance real-time as it adds refrigerant, and when the performance begins to decrease it removes refrigerant until the performance peaks again.

Posted on Jun 05, 2008

alicantecoli
  • 22095 Answers

SOURCE: Ford Expedition 2002 Front Heater blows cold air below 45 MPH

impeller is made of plastic on teh water pump and its slipping and spinning on the shaft renew before weather warms up as engine will overheat

Posted on Jan 01, 2009

csmock132
  • 4669 Answers

SOURCE: Heater making noise and not blowing hot air.

You need to replace the temp actuator.

Posted on Apr 08, 2009

  • 518 Answers

SOURCE: rear airconditioner blowing hot air

CHECK TO SEE IF ANY OF THE CABLES HAVE BECOME DETTACHED FROM THE HEATER OPERATION

Posted on Jun 13, 2009

  • 11 Answers

SOURCE: 1998 for taurus heater wont blow hot air only cold

you need to check the blend door in the heater box it maybe broken or stuck.the blend door switches between the heater core and ac evaporator to provide a mix of temperature

Posted on Oct 18, 2009

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2 Answers

2002 Ford Taurus, Heater blows cold air?


What have you checked so far ?
Radiator full of coolant ? Heater hoses getting hot ?

Feb 23, 2015 | 2002 Ford Taurus

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What if the heater hose going in is hot and the heater hose coming out is cold.the heater will blow cold air


Possibly the heater core is 90% blocked. open enough to draw hot water in, (hose feels hot) but not enough volume to provide heat from very cold air, 10% hot water gets cold quick, coming from core..
Flush heater core in reverse direction - cold side in hot side out..

Just a theory..

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check to see if your hoses to heater core are hot on both sides. my 93 hoses where hot going in the heater core but not out. I flushed the heater core now I have heat

Dec 12, 2010 | 1993 Cadillac DeVille

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My AC only works when the car is in motion. It blows warm air otherwise.


Sound like maybe your a/c condensor fan is not working, should come on with a/c on, the fan sit in front or back of radiator, condensor is bolted to the front of the radiator, if its not working at stops no air blows through condensor and pressure will get high and a/c wont blow cold, while driving air is running through condersor so a/c will work fine.

Jun 30, 2010 | 2003 Lexus RX 300

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Heater will not blow hot air. it blows cold air and fan blows. new thermostat and full radiator


The heater core is possibly blocked or the temperature adjuster is not working.

First check the controls to be certain that the temperature aduster is working and the flaps/doors that direct the flow of hot air are working.

If they are..........

Check heater hose temp. If one is hot and one is cold, you are not getting flow through the heater core.

Bleed it to remove an air blockage.
If that does not work, flush the system.
If that does not work, replace the heater core.

Karl at topgunwon.com

Feb 18, 2010 | 2002 Ford Explorer

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1998 Oldsmobile Silhouette a/c blows cold in rear but the front vents blow hot air. A new condensor was just installed and a/c charged.


Hello.Maybe I can steer you in the right direction. There is an actuator temp,door motor.It may be hard to find,but most of them are on the bottom of the blower box about where the ac hoses and the heater core is,under dash.This motor has gone out,it switches from cold to hot ,and all in between .Hope this is helpful.If not let me know.roniecon@gmail.com

Jul 17, 2009 | 1998 Oldsmobile Silhouette

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My heat blows hot for about 5secs then grt cold again whats that


If there is no sign of coolant loss (air pocket in heater core),then check for plugged heater core. Both hoses should be very close to same temp with engine at operating temperature with heater fan on high setting.If the return hose is alot colder, then coolant flow is restricted.

Jan 31, 2009 | 1999 Ford Expedition

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Rear heat in 2006 yukon blowing cold air


locate the rear heater hoses, make sure eng is at operating temp.
fill of the 2 hoses , should be worm tot he touch, if one is hot and the other is luke warm, the problem is in the circulation in the rear heater core. thanks and good luck . let me know.
kindest regards Bill ps. don't over look the fan speed at the rear core.

Jan 30, 2009 | 2006 GMC Yukon

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2001 tahoe front heater not working, rear heater blows warm air


Notorious for plugged heater cores. Also updated plastic restriction couplers mounted at heater core available from dealer. Try back flushing heater core. Run engine till its at operating temperature then carefully hold the inlet and outlet hose breifly with heater fan on high if hoses are nearly the same temp then flow is good , if not then core is plugged.

Jan 18, 2009 | 2001 Chevrolet Tahoe

1 Answer

Heater will not get hot


first, make shure that the water level in the radiator is apropriate, then ck the thermostat for oppening and closing(you wont have a heater if the thermostat is constantely open) ck the 2hoses that suply hot water to the heater core, both hoses must be hot when engine is runing .if one off the hose is cold ,the hot water is not circulating to the core and back to engine .ck the valve , see if you can by pass it and see the results if you have heater , replace the valve. nicolas

Dec 22, 2008 | 1989 Jaguar XJ6

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