Question about 1997 Mercury Mountaineer

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Cannot get heat, the AC works but not the heat. Could it just be the control which I assume is the thermostat or could it be the heater core?

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Take the heater core hoses off at the firewall and add cleaner/flush directly to the core. Run water through and get the gunk out. Ford has a WYE piping system that will bypass the heater core and not allow it to FLUSH and it will get plugged.
The other thing to check is the BLEND DOOR and it is operated by a little motor which you can observe if you have the panel where the radio/heater controls are off. It swings from heat side to a/c side (and in between)as the colors on the knob are rotated. Watch the operation and hope the door has not come off inside the box or the cable.

Posted on Oct 24, 2010

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1 Answer

'94 Ford Taurus-No Heat?


Good point. Solving it will probably take more time than money.
Thermostats and heater cores do not work one day and stop the next. If your engine warms up normally and doesn't overheat, the gauge reads normally, engine is at normal operating temperature after about 10-15 minutes ...all these point to a good thermostat. It is working right and should not be a problem.
To check the heater core, wait till engine is at normal operating temperature. Turn heat setting to high, then feel both heater hoses-both should be hot. If both are hot the core is circulating coolant and is not a problem. If only one is hot (which would be the inlet hose) the core is not circulating-could be an air block or the core is plugged up and will need replacing.
If heater core and thermostat are good, then it probably is the temperature blend door in the heater case. The door actuator is probably vacuum controlled. I don't know how difficult it is to troubleshoot on your Taurus, but check if vacuum controls are working right from the dash controls, check if the blend door is stuck, is broken, or if the vacuum control is working to open and close the blend door. When you want heat, the blend door should let blower air pass across the heater core.
From the engine you will have a single vacuum hose that goes through the firewall into the dash to the heater/AC controls. There, a pod like device can rout the vacuum signal to various doors on the heater case.
Good luck.

Jan 07, 2014 | Cars & Trucks

1 Answer

No Heat


It Sounds Like You Have Either A Faulty Heater control Valve Or On The High Side A Bad ATC (Automatic Temperature Control). Check The Hoses That Go Into The Heater Core Both Should Be Hot At Normal Operating Temp. If The Outlet side Is cold Or Luke Warm You Have A Bad HCV.

Apr 23, 2013 | 2006 Buick LaCrosse

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1999 trailblazer vortac v6 no heat


if both heater cores coolant hoses are hot.hot coolant is going through heater core. problem more likely could be faulty heater air door actuator or heater and ac control module could be faulty.

Dec 17, 2012 | 1999 Chevrolet Blazer

1 Answer

My heater isn't working..how do i fix it?


Here's a list of possible culprits:

Priority Action Part Type Cause
1 Inspect - Antifreeze Needed - Coolant Level Low.
2 Inspect - Heater Control Valve - Leaking or Faulty Heater Control Valve.
3 Inspect - Thermostat - Thermostat Stuck Open.

First thing to check is your engine coolant level - quick and free.
Since your blower works, my nominee for the offending part would be the Heater Control Valve, which redirects hot coolant into the passenger compartment heater core. Without hot coolant, the blower will just blow cold air, since the heater core isn't getting the needed flow of hot coolant through it.
There may also be a fault in the "Temperature Valve Actuators" (there is a right hand and a left hand version of these - one for each side of the car).
The Right hand Temperature Valve Actuator is AC Delco part #15-72971.
The Left hand Temperature Valve Actuator is AC Delco part #15-72972.
Their pictures are available in the online AC Delco Parts Catalog at:
http://parts-catalog.acdelco.com/catalog/catalog_search.php
Here are your parts search parameters:
Vehicle: 1996 OLDSMOBILE AURORA V8-244ci 4.0L F/I Vin C ID# 17739
Group / Subgroup: Heating/AC / Heater Core and Htr Control Vlv

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I have no heat in my 2000 ford expedition. The blower motor works but only blows cold air. As far as i can tell the heater core hasnt been by-passed.


Time to either flush or replace the heater core as it may be plugged with rust build-up. I'm assuming the engine is running at normal operating temperature, if not then the thermostat may need replaced.

Mar 04, 2011 | 2000 Ford Expedition

1 Answer

The heat in my 93 talon dont work. the fan blows, and i have flushed the heater core. still no heat. it is getting cold in kentucky. please help.


If you have flushed the heater, I assume you did this by removing the hoses from the thermostat housing. If there's still no heat, check

1. the thermostat is actually present. If not, put one in. If the radiator core is in bad shape, or blocked, replace the radiator.

2. the thermostat is not jammed open. If so, replace it and use a new gasket under the cap.

3. Verify that the water pump belt is not loose.

4. Remove some dash panels to get access to the heater core valve. Check that the valve is actually turning when you adjust the dash control.

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Hello, No! I'm assuming that the temp gauge is working in truck & you are not over heating. On the passenger side firewall check both hoses going to/from heater core. If both are not warm then it is probably a heating core plug. You will have to replace the heater core.

Jan 06, 2010 | 1996 Dodge Ram 1500 Club Cab

1 Answer

01 ford expedition has no heat or a/c. replaced thermo and flushed it. any other ideas?


Assuming.......the fan switch works. You may have a blocked or leaking heater core. Hopefully you checked the thermostat before you put it in....you can heat some water up and put the thermostat in it to see if it opens. Not sure if there is a heater control valve in that ride, probably is, you may not be getting any water through it to allow water into the heater core.

Oct 11, 2009 | 2001 Ford Expedition

2 Answers

Ac and heater not working. New Heater core and


You need to but a scanner on the computer and activate the AC. If it does not activate you may have a bad PCM. Also if the pressure in the AC is low it will not run. Also you have a AC relay in the engine fuse box.

Now for the bummer part. I have this same truck. Replaced heater core and I didnt get the blend door quite on track and it jammed. I had to take the dash off again. Also your center heat control may be bad.

I don't think these two problems are related. Even without AC your heat should work. Do you have rear climate control also. See if that works. If it does you may have a jammed door for the dash area

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it is the heater core ask auto zone to help u out

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