No Heat
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No Heat
I have a 97 f150 that in the winter it will not produce heat, I replaced the heat selector switch because I could get to it. Still no heat.. I read a response from FordMasterTech and how to check the blend door, where exactly is this spot that you can check it at? Any help would be great...thanks
Member
Joined: Feb 2004
Posts: 34
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From: Texas
youre gonna love this one bud!!!!
I have a 97 F150 myself and replaced two heater cores in the truck.
This is the part you will love. The Heater core and Evaporator core are behind your dashboard. The whole dash has to be removed to get to the holding unit. Absolutely cannot do it without removing the dash - Ive done it 2 times and took about 8 hours the first time and 5 hours the second time. - Your blend door is in that unit also. But before you do all that work you can listen for the blend door.
turn your key on but dont start the truck. Turn your AC to cold and then to hot and see if you can hear the blend door swinging into the position it needs to be in - if you dont hear movement under your dash its the door.
But it could also be something as simple as a thermostat sticking open keeping your coolant in your engine from getting hot enough or your water pump not circulating correctly.
I just replaced thae second heater core four weeks ago and I am now not getting hot air either. I think the first and simplest cheapest thing to check will be the thermostat.. Going to get one this week.
Good Luck
Lance
I have a 97 F150 myself and replaced two heater cores in the truck.
This is the part you will love. The Heater core and Evaporator core are behind your dashboard. The whole dash has to be removed to get to the holding unit. Absolutely cannot do it without removing the dash - Ive done it 2 times and took about 8 hours the first time and 5 hours the second time. - Your blend door is in that unit also. But before you do all that work you can listen for the blend door.
turn your key on but dont start the truck. Turn your AC to cold and then to hot and see if you can hear the blend door swinging into the position it needs to be in - if you dont hear movement under your dash its the door.
But it could also be something as simple as a thermostat sticking open keeping your coolant in your engine from getting hot enough or your water pump not circulating correctly.
I just replaced thae second heater core four weeks ago and I am now not getting hot air either. I think the first and simplest cheapest thing to check will be the thermostat.. Going to get one this week.
Good Luck
Lance
Senior Member
Joined: Apr 2003
Posts: 271
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From: South Ga
Pull the little black trim panel above the tranny hump. You will see a small (white i think) connector going to a little white component.
That is the blend door actuator. Key on, heat on, check the movement of what looks like a 1/4" drive shaft.. If it sweeps back and forth, motor is good. Let me know what you find on the blend door motor..
Good Luck
FordMasterTech
That is the blend door actuator. Key on, heat on, check the movement of what looks like a 1/4" drive shaft.. If it sweeps back and forth, motor is good. Let me know what you find on the blend door motor..
Good Luck
FordMasterTech
Member
Joined: Feb 2004
Posts: 34
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From: Texas
Hey FordMasterTech...
I just replaced my heater core recently and the vents are pushing very little heat out. Could this be a water pump going bad or maybe a stuck (open) thermostat keeping the water from getting very hot???
Ever run into this problem?
I just replaced my heater core recently and the vents are pushing very little heat out. Could this be a water pump going bad or maybe a stuck (open) thermostat keeping the water from getting very hot???
Ever run into this problem?
Senior Member
Joined: Apr 2003
Posts: 271
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From: South Ga
Something else I thought of today, Do you have a lot of dust/dirt under the hood of your truck? The reason I ask is because the evaporator core could be partially plugged causing the inadequate airflow that you describe as well.
Just a thought I had today.. Living in south Georgia with a bunch of farmers that is fairly common in these parts.
Good Luck
FordMasterTech
Just a thought I had today.. Living in south Georgia with a bunch of farmers that is fairly common in these parts.
Good Luck
FordMasterTech
Member
Joined: Feb 2004
Posts: 34
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From: Texas
I'll check the ****...
as far as the dirt in eng. comp.
I just did a detail to the engine about 2 wks ago and still have the same problem...
????
I can feel the warm air barely coming out of the vents, and the fan blows hard too so I know its not the fan - UNLEEEESSSSS
there are 2 fans?
A/C blows cold and hard - thought I would mention
as far as the dirt in eng. comp.
I just did a detail to the engine about 2 wks ago and still have the same problem...
????
I can feel the warm air barely coming out of the vents, and the fan blows hard too so I know its not the fan - UNLEEEESSSSS
there are 2 fans?
A/C blows cold and hard - thought I would mention
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Junior Member
Joined: Mar 2002
Posts: 8
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From: Ft. Myers, FL
I have a similar problem to the ones above. However mine seems to be a little more complex. To begin, the problem seems to be sparatic. When I turn on the ac and have the temp *** set at its coldest position it will blow cold for a few minutes the start to blow hot air. The amount of time it takes for the air to turn warm does not seem to be the same from instance to instance. After this happens I can turn the ac selection *** off and turn the temp *** throuhg the temp range and if I keep playin with it I can get cold air to blow again. Now the heat side of the system seems to have the same problems. Does this sound like anyting familiar to anyone? Blend door maybe? Thanks for any insight!!!!
Junior Member
Joined: Mar 2002
Posts: 8
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From: Ft. Myers, FL
Another note....I pulled the trim panel as the master-tech suggested and looked at the blend door actuator. The shaft rotated as I moved the temp selector. The only thing I noticed was there was a black "collar" that the plastic drive shaft goes into and it was split. Is this normal??
Junior Member
Joined: Mar 2004
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I am experiencing the same problem as brut28481. I have trouble getting the heater to blow heat (AC currently works fine - but then again summer hasn't kicked in yet). With my situation I can feel a difference in the physical resistance as I turn the the temperature control **** - not a lot but enough to tell the difference. When the resistance is greater, then the temperature actually responds to the **** setting. When the resistance is less, the temperature of the air does not change. It acts like the **** is somewhat stripped.
I have not checked my **** yet, but after reading the forum on "Temperature Selector Problems '99 XLT" I am hoping this is the problem I am having.
brut28481 you did not specifically state that you checked the **** for hairline cracks but sounds like maybe this is the problem you are having too...? Try swapping the temp control **** with the fan speed **** and see if the problem with the temp control goes away.
I have not checked my **** yet, but after reading the forum on "Temperature Selector Problems '99 XLT" I am hoping this is the problem I am having.
brut28481 you did not specifically state that you checked the **** for hairline cracks but sounds like maybe this is the problem you are having too...? Try swapping the temp control **** with the fan speed **** and see if the problem with the temp control goes away.
Last edited by cwitucki; Mar 17, 2004 at 08:59 AM.
Junior Member
Joined: Mar 2002
Posts: 8
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From: Ft. Myers, FL
Well I believeI have found the problem. After changing the temp nobes around and not fixing the problem I decided to look at the blend door actuator assembely a little closer. After I took the actuator out I realized what the problem was........broken blend door. Right where the shaft of the actuator contacts the blend door it cracked into four different pieces. Now I guess I have to take the dash apart and replace the blend door. I hope this door is specifically called the "temperature blend door" becasue that piece is only like $35.00 and the other blend door in the heating unit (not sold seperate) is like $200+. Does anyone have any info on this situation and any advice about taking the dash out to fix it?? Thanks!!!!
Member
Joined: Feb 2004
Posts: 34
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From: Texas
brut - heres your advice ---- take careful note of where screws came from...
Disconnect battery before taking out passenger air bag..
and good luck!
Get haynes manual before attepting the dash - it comes apart in many different pieces
Disconnect battery before taking out passenger air bag..
and good luck!
Get haynes manual before attepting the dash - it comes apart in many different pieces
Junior Member
Joined: Mar 2002
Posts: 8
Likes: 0
From: Ft. Myers, FL
fergubl- I have the ford manual on cd. It is very helpful. The only question I have is do I have to drain the heater core and evacuated the ac lines? I was thinking I didn't have to becasue I am not removing any of those components (I think) just swapping out the blend door.....