Question about 2002 Ford Expedition

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Heat is not blowing hot air-how do i tell if its bad heater core or bad climatronic control

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If the heater core was bad it would be leaking fluid to the inside of your car. a heater core is nothing but a small radiator. how much water flows and how fast is controlled by the climate control. some cars have a on off gate assembly that is installed in one of the heater hoses to regulate the flow under the hood. others use a series of doors within the heater assembly to stem the flow of hot air into the passenger compartment.
open your hood and on the passenger side of the motor start at the radiator one heater hose will be located at the top of the radiator this is low pressure return the other will be comming out of the motor either directly from the water pump or the thermistat housing this is the high pressure hot in feed this hose usually will have the water control gate in it between where it comes out of the motor and where it enters the firewall. check this to make sure the control cable is hooked to it. and in the event of an electric control valve. unplug it and jump it with a 9 volt battery to make sure it will move. if its electrical a blown fuse could be the problem as well

Posted on Nov 06, 2010

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Why is my heater blowing cold


Most likely it is the heater control valve that shifts air from blowing across your heater core to your air conditioner core.

If your fan works and your car is fairly new..meaning your heater core isn't dirty and full of craap...then it is the climate cotrol valve.
If you are lucky, it might be a thermostat that is bad and blocking hot water from entering your heater core. Bottom line, if hot water doesn't circulate thru that little heater core, you won't get heat.
You might be able to look under the hood and grab the hot water lines that go thru the firewall and feed your heater core. If they feel cold to the touch after engine has warmed up, then you aren't getting circulating water to the heater core. If they feel nice and warm, then the heater core is fine, but your climate control valve has closed off the fan that blows across the core to disperse heat into the cabin

Feb 24, 2015 | Cars & Trucks

1 Answer

2011 jeep liberty heater blows cold air


gas not diesel right?
what engine? option? size?
there are only 3 causes (and many parts to fail)
  1. engine coolant not hot at 180F or more.
  2. said coolant not flowing Through heater core (feel the 2 hoses?)
  3. air not flowing over heater coil. , damper stuck closed?

once the above is found.we can diagnose why?

the FSM covers all this , in the HVAC chapter.
say engine is hot, and core is hot.
you check the damper and its stuck closed.
?
1: controls not telling damper to move. (falling)
2: damper motor bad. (called the HVAC acuator by jeep)

on this new of car, we must scan it, the scan tool that supports
jeeps will set HVAC errors aplenty.
my innova 3160 can do that.

my FSM dont do that new a car.

or
engine not hot
heater core not hot
or damper door stuck closed on core, blocking heat.

Mar 21, 2014 | 2011 Jeep Liberty

1 Answer

No heat in Audi A6 1995 had heater core and valve


U HAVE A CLIMATRONIC OR A MANUAL ONE?CLIMATRONIC IS WITH THE TWO SCREENS!!IF U HAVE THE CLIMATRONIC THERE IS A SERVOMOTOR THAT CONTROLS THE HOT AND COLD !!! IF POSSIBLE SEND PHOTOS

Feb 27, 2014 | 1995 Audi 90

1 Answer

Why my air condition blow cold air even when its not on


It blows cold air with the mode selector in what position. If it is on defrost and you have the temp adjusted to full heat than the a/c will be on to dry the air before it hits the windshield, this helps to remove the fog from the windows. If there is no heat coming out the vents than you need to check to make sure the blend door is working. You should hear a distinctly different sound out the vents when you turn the heat from full cold to full hot. Also check to see if the heater core is plugged. With the engine warm you should be able to feel little difference in the temp of the two hoses that go to the heater core. If one is hot and one is cool than there is a flow issue. Either the water control valve is bad, it is not being opened by the HVAC control head, the is a vacuum leak to the control valve or the heater core is plugged. Your vehicle may or may not have a valve that controls the flow of hot water to the heater core.

Sep 08, 2013 | Ford Ranger Cars & Trucks

1 Answer

Heater core is working properly but car will not blow hot air only cold air i am thinking the flapper that controls hot \ cold is stuck in the cold air position


To troubleshoot this types of problem,click the link below :----http://howtobyme.blogspot.in/2012/02/heater-blows-only-from-defrost.html
--------Go through the procedure to confirm the issue.

------
Engine Overheats and heater blowing cold?

http://howtobyme.blogspot.com/2011/11/engine-overheats-and-heater-blowing.html

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Heat blows cold on drivers side and hot on passenger side?

http://schematicsdiagram.blogspot.com/2011/12/heat-blows-cold-on-drivers-side-and-hot.html

-----------


This will help.Thanks.

Jan 25, 2012 | 2001 Buick LeSabre

2 Answers

The heater core is going bad in my blazer, but it still blows hot air. When I turn the control to switch the heat from vent to defrost or floor, it still blows out of the vent. How do I fix this?


THAT HAS NOTHING TO DO WITH A HEATER CORE IF CORE IS GOING OUT IT WILL LEAK THATSOUNDS LIKE AN ACTUATOR ACTING UP OR VACCUUM LINE LEAK BEHIND DASH

Apr 06, 2011 | Chevrolet Blazer Cars & Trucks

1 Answer

Heater not working


What does that mean? It blows air but not hot air? It doesn't blow air at all with A/C or heat? I assume you mean it blows, just not hot. If so, make sure your car is running at operating temp. If the car isn't warming up, your thermostat is stuck open and the coolant can't heat up enough to transfer heat from the heater core to the air you're blowing out the vents. If your car warms up to operating temp just fine, you may have a heater core issue. Your core may be clogged with corrosion thus not allowing heat transfer as well. If the valve on the inlet hose to your heater core is bad it won't allow hot coolant into the heater core, once again no heat to the air blowing out your vents. One of these is most likely your issue. I hope this helps.

Feb 03, 2010 | 1995 Ford Escort

2 Answers

4.6 liter has one heater hose warmer than the other. may be plugged core,or is ther a fuse to climate control switch?


Look for a heater valve on one of the hoses if there is no valve i would say its a plugged heater core.

Dec 11, 2009 | 1999 Ford F150 Regular Cab

1 Answer

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

3 Answers

I have changed the theromast twice and flushed the coolant system.The heater core is not leaking.. the blower is still blowing cool air.


The heater in your car depends upon a flow of hot coolant going through the heater core in order to get hot air into the car. If the heater core is partially plugged, it will restrict the flow. If you have a head gasket that is putting exhaust into the cooling system, it will eventually get into the heater core. When this happens there is no coolant in the heater core to make the air warm. If the water pump vanes have corroded away the result will be very poor coolant circulation causing the heater to not blow hot air. If your car is equipped with a heater control valve that is not functioning properly, the coolant flow will be restricted. One or a combination of these factors is likely the culprit in your case.

if the car is not overheating, the thermostat is working fine.... replace or flush the heater core multiple times to try and eliminate sediment build-up.

Jan 13, 2009 | 2003 Ford Expedition

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