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97 ford expedition when on heat setting blows cold. Blend door works properly (I cut a hole with dremel tool into box behind glove box and can see the door move back and forth), heater core hot to the touch when I reach in and touch it and with temperature scanning lazer it is 170 degrees F and the supply lines to and from are hot, a/c runs non stop and not cycling. The a/c core inside the box scans at 14 degrees F and seems to be way to cold to get heat from the heater core in the same box. How can I get the A/C to cycle properly?

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Posted on Jan 02, 2017

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SOURCE: heater blows cold air. I have replaced thermostat,

Not an expert by any means, but i know my ranger.. I had a small leak at the top of my radiator that still cooled the engine but didnt have enough pressure to get to the heater. The heater hoses travel up over the engine and just were not gettin anything to my heater core. That or make sure the heater control valve is operating.

Posted on Apr 16, 2010

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mabpest
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SOURCE: 1999 ford f150 only blows

the flapper door is not closing and opening properly...it is located in the duct work....remove heater control panel and follow the cable to the flapper door

Posted on Jan 26, 2011

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SOURCE: 98 Jimmy Blend door cycling

I have the Heater/blend door to replace the old one in my 98 gmc jimmy. I cant get the part to slide on the shaft. Any ideas?

Posted on Jun 28, 2011

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1 Answer

"Relearning" process for re-installation of blend door actuator motor (if necessary) on 1997 Ford F150.


There is no process, just make sure the battery negative cable is disconnected before install the part.

Apr 19, 2017 | Ford Cars & Trucks

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Heat comes thru driver's side vents, but blows cold air thru passenger side vents


You likely have a faulty blend door. It could be electrically, mechanically related, or even a broken door. It may be the blend door motor, or possibly the temp sensor.

Dec 30, 2012 | 2010 Ford Flex

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My 2004 ford explorer makes a clicking noise when selecting between cold and hot air. And the AC will not blow cold air / heater will not blow warm air.


it is the blend door, driver side by gas pedal, very hard to get to, the door has a rotery gear that when the teeth break off, thats when you get the clicking sound

Jun 06, 2017 | 2004 Ford Explorer

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Have ford f150 1996 wont switch to heat from cold replaced switch already


96' or 97' it makes a big difference. 96' models are very simple if you have a basic understanding of automotive work and some basic tools. remove the glove box, the heater core is located behind a panel just inside and below the glove box hole. first remove the plastic panel but not the heater core, to the left of the heater core inside the box is the blend door that separates the heater and A/C cores. this door is often obstructed by pens, pencils, or plastic junk that have fallen down into the defrost vents on top of the dash and landed in the box. something like this will stop the blend door from being able to close the A/C core off from the vents allowing cold air in. if you have big hands like mine you may need a woman or teenager to reach into the box and check for debris but you can see the door open and close when you turn the switch so you know where to check. if you have a 97' model the blend door actuator is electric and usually not accessible without removing the dash and heater/A/C box from the firewall. good luck

Jan 13, 2011 | 1997 Ford F150 Regular Cab

1 Answer

My 1997 ford expedition is only blowing cold air, is there a fuse i could change or is it the heater core?


Sounds like the common blend door failure on the Expedition. The problem is either with the heater core not getting hot, or the blend door not diverting air through the core. This is a common problem that Fords have. It is caused by the blend door getting stuck. This door is located behind the glove box and it controls the flow of Heat and A/C. Its probably stuck or broken, allowing the cold air from outside to come in instead of the heat from the heater core.
The heater core is difficult to change on the Ford trucks. They have it buried in the plenum box and you have to remove the steering wheel, steering column, dash, evacuate the refrigerant system, drain the radiator, and remove the plenum box to get to the core.

Replacing the core is easy, getting to it is a day's work. The Expedition is particularly difficult to get to. It is almost above the transmission tunnel and well buried behind the dash. The Expedition uses the same plenum box as the F150, so any information on that system applies to the Expedition/Navigator.

You need to be sure that the heater core is really the problem before tackling this job. If you have a pool of coolant on the floor, you'll have to go after the core. If the problem is lack of heat, there are some things you need to eliminate before tearing into the truck. You need to make sure that coolant is flowing through the core. Check the temperature of the heater hoses going into the firewall when the engine is cool and see if they warm up together as the engine warms up. If both hoses get hot at about the same rate, this is a good indication that coolant is flowing through the core. You can also remove the hoses and flush the core with a water hose splice from Home Depot and a water hose. Water should flow unobstructed through the core.

If it appears that coolant is flowing and you don't have obvious leaks, the next step is to check the blend door. This door controls the air flow through the heater core and failure is common on Ford trucks. When the door breaks, it can block the flow of air through the core and kill heat and will also have an impact on AC. If the system seems to work intermittently, it's a good indication that the door is broken and rattling around randomly blocking or opening the passage to the core.

For diagnostic information on how to check the operation of the blend door and a cheap easy fix, check the heatertreater listing on Ebay or the web site at heatertreater.net. The dealer fix for the blend door is basically the same procedure for replacing the heater core, so it will be expensive. The HeaterTreater alternative will solve the problem at a fraction of the cost and work and is well within the capability of the average shade tree mechanic.

You can try to fix it yourself if you check THIS VIDEO: Ford Expedition Lincoln Navigator


Hope helps.

Dec 21, 2010 | 1997 Ford Expedition

1 Answer

I have a 1998 Ford Expedition. The Front heat is not working properly and blows only cold or tepid air. The fan switch doesn't work on first two settings (lo & med). My Mechanic told me it was the...


Was your blend door cable operated? I looked up the valve, and it appears to be cable operated. It would be along the heater hose. The lever should move back and forth when the temp is changed from cold to hot. See picture below.
When you were tearing your box apart, did you run across the blower? It's either just above the passenger's right foot or it's in the engine compartment in front of the passenger. Picture below shows the resistor mounted right next to the blower. You may want to check the switch with an ohmmeter too. Here are a couple links with a bit more info on each issue you are dealing with: http://www.fixya.com/cars/r6234839-doesn_t_heater_or_air_conditioner_blow http://www.fixya.com/cars/r6235876-no_heat_fan_blowing_cold_air

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Dec 20, 2010 | 1998 Ford Expedition

1 Answer

I have a 1999 jeep grand cherokee and the heater is hot on the drive side and cold on the other side


Assuming you are going to replace the 99/04 Jeep Grand Cherokee blend doors yourself.
You would start by disconnecting the negative battery cable.
If you are going to remove the dashboard, etc to replace the blend doors.
some websites give you complete instructions with plenty of pictures.
It will take the average person with little or no auto repair skills approximately 12 to 16 hrs.
The vehicle will have to be taken to a shop that can recover the refrigerant before you start removing the dashboard and HVAC box..

If you are going to do the type of repair where you cut an access hole in the side of the HVAC box.

A short version of how the access hole repair is done.

Disconnect the Negative battery cable.

Lower the glove box

Remove the actuator motor - You will need a Phillips screw driver

Cut an access hole in the plastic HVAC box - Use a multi-purpose cutting bit, you will need a rotary type of cutting tool, like a Dremel, RotoZip, etc. Or you could do the cutting by hand with any type of small cutting tool, it will just take longer doing it by hand. Or some people have used a narrow pointed soldering iron!

Remove the broken blend doors

Install the new blend doors.

Replace the actuator motor.

Close the access hole - Replace the wall piece of plastic you cutout -Use foam tape or an aluminum tape to cover the groove made by cutting the wall.

Close the glove box.

It is almost as easy as what you just read, the hardest and the most time consuming thing to do is cut the access hole.
The job should take between 30 minutes to 1 ½ hours. Depending on how long it takes you to gather your tools, etc.

Dec 07, 2010 | 1999 Jeep Grand Cherokee

3 Answers

Why does my Heater blow cold air in the front


its the blend door behind the glove box. I had the same problem

Nov 11, 2009 | 1998 Ford Expedition

2 Answers

Heater blows cold air. I have replaced thermostat,


Not an expert by any means, but i know my ranger.. I had a small leak at the top of my radiator that still cooled the engine but didnt have enough pressure to get to the heater. The heater hoses travel up over the engine and just were not gettin anything to my heater core. That or make sure the heater control valve is operating.

Oct 26, 2009 | 1997 Ford Ranger SuperCab

2 Answers

2001 ford expedition only blows hot air and when fan is off it keeps drivers feet hot


Hi under the hood the hoses going into the fire wall from the engine on one of the hose you have a valve which is open and close by a solenoid when it's defective it stays open check and close the valve

Sep 09, 2009 | 2000 Ford Expedition

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