Question about 2002 Mercury Mountaineer

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Inside heat does not get hot enough

Heat inside vehicle does not get hot enough. engine temp is fine and fan motor works. heater core seems fine and doesnt leak like most bad cores. its in a 2001 mercury moutaineer. i read it could be fresh air vent stuck open but doesnt seem

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Could be the temp blend motor not working. does the heat go from hot to cold or is the temp always the same?

Posted on Mar 01, 2009


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Radiator electric fan motor on a 2004 jeep grand Cherokee won't come on when temp gets high

HINT 1:check fuses first???????
the free FSM book is here
read that? HVAC and cooling chapters.

heater does not blow hot air AT VENTS.
does that mean blower dead?

is hot AIR knob at hot zone.?
is fan on high, :"?
can you hear a normal sounding fan on high???????
does it fail in recirc mode and vent??
Does hot are work with car moving fast?
is engine at 180f or more>using tools to measure rad temp?
yes,/no, if engine is hot, and AF LEVELS ARE FULL
did you scan the pcm for hvac errors (DTC)
Then this is a HVAC failure.
some GC have a hvac calibrate mode, read the Fsm ON THIS.
some have the climate control option, do you,????? very important fact to know.


WJ JEEP (got AZC?)
see wiring-air-cond.......

guess what. things fail
scan it
no scan it twice. and win..
only with AZC OPTION
SEE ALL THOSE lines bottom
lots of damper motors on each
COMPLEX. diagnosis. if present.

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The TVA below runs the blend door. motor. unlike aBOVE.

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Jan 19, 2016 | 2004 Jeep Grand Cherokee

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I have a 2002 Ford torus that doesn't put out enough heat in the winter I have flushed out the heater core and change the thermostate but it still don't get warm enough and it doesn't have a...

If both heater hoses are getting hot then you know the coolant has to be flowing and the core should be hot.
What you will have to do is locate the blend air door servo.
The blend air door is a door (or flap) between the heater core and the A/C evaporator (even without a/c there is still a door to control the cabin temp)
Early vehicles with the slider controls used a cable but the later vehicles with a rotary knob or digital buttons use a servo to rotate the door mechanism.
The servos can go bad and the switches as well.
But from the sounds of it, your door is not moving to allow the heat through the vents.

Oct 01, 2011 | Cars & Trucks

3 Answers

We just bought a 1999 GMC Jimmy and the heater doesn't work. The fan blows but there is no heat. The air conditioner works fine.

Could be that the heater core is disconnected, there are two hoses that attach to the heather core that come out of the engine, this provides hot water to the core thus making the heater work, when the heater core starts leaking water the quick and fast fix would be to bypass the heater core and connect the two hoses together, check under the hood on the left passenger side there should be two hoses about 1" thick see if there are connected together or of they seem to be connected to 2 outlets that come out of the inside of the vehicle. people do that specially if selling vehicle.

Sep 06, 2010 | 1999 GMC Jimmy

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My 2005 Jeep Liberty will not blow heat through heater ducts. Fan works fine but blows only cold air. Any idea what the problem is?

heater valve if you have 1 ,or temp control actuator which is under the dash and takes hours to replace!

Jan 30, 2010 | 2006 Jeep Liberty

1 Answer

Hello. I have a problem getting any heat inside the car. Everything is ok with the engine, the water have free access thrue the heater inside, but i dont get the heat into the car. the fan is working...

if coolant is moving thrue heater core it have heatup, or another cause could be the motor on blower for selecting temp,or if no motor there then 100%problem with temp selector cable is not working.

Jan 24, 2010 | Volvo 850 Cars & Trucks

1 Answer

Engine heats to proper temp, heater fan works, already replaced termostat. heater core doesn't seem to be leaking.

Find where both hoses are going to the heater core from the firewall side after engine is up to temp.Touch them with your hand.If they are both quite warm the water is flowing thru the heater core. If only one is hot the core is stopped up. If both are hot and still no heat the heater door in the heater box is staying closed.

Jan 15, 2010 | 2002 Ford Taurus

1 Answer

My heater fan turns on before the car has warmed up. It blows cold air? Any ideas why?

After warmup it still blows cold, or only when cold? Normally the fan will operate independently of engine temp except in some climate controlled vehicles. As long as it blows warm air after engine is at temp that's a good thing. the heater uses hot water from the engine. Obviously the heater can't be warm before the engine is. If it's cold after the engine is hot, there are vacuum controlled "motors" on top of the heater box under the dash that move doors that control heat. Either one of the control motors or one of the doors have stuck or failed. Many also have a control valve on one of the heater hoses under the hood as well. If the engine comes up to temp then the thermostat is good (should be at about 210f) Only remaining item is the core itself which may be internally or externally obstructed.
All this being said, if it's good when the engine is up to temp, leave it's fine.

Nov 30, 2009 | 1996 Jeep Grand Cherokee

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