Looking for some heat!
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Looking for some heat!
My 94 F-250 doesn't seem to have much in the way of heat in the cabin. I had previously changed to a cooler thermostat because of my Super Chip. Thinking the thermostat change was the cause, I replaced the thermostat, this last weekend, with a 195 degree unit.
Now the truck builds up a good level of heat in the cooling system, but I'm still not able to heat the interior of the truck. The blower motor is moving air, but very minimal heat is coming out of any of the ducts, heat or defrost.
Is there something that might have come loose from the switch controls, or ?
Any advice on where I should start looking and/or possible causes would be greatly appreciated.
Now the truck builds up a good level of heat in the cooling system, but I'm still not able to heat the interior of the truck. The blower motor is moving air, but very minimal heat is coming out of any of the ducts, heat or defrost.
Is there something that might have come loose from the switch controls, or ?
Any advice on where I should start looking and/or possible causes would be greatly appreciated.
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Thanks for the replies thus far!
I went out this morning, warmed the truck up. When operating the heat control, between cold and hot, I can hear a door opening and closing. I'm going to assume that would be the blend door you've all listed in your replies.
Although it's been a while since I replaced the heater core, my memory leads me to believe the problem started around that time. Would it be possible that I have an air pocket obstructing the flow of water in the heater core? If so, can I merely pull the heater hoses and flush with water to correct the problem?
I don't drive the truck much, less than 5K miles a year on average. However, it sure would be nice to have some heat when I do.
Need to head out to TX this weekend to pick up a trailer. Would not be a very pleasant trip with the wife freezing.
I went out this morning, warmed the truck up. When operating the heat control, between cold and hot, I can hear a door opening and closing. I'm going to assume that would be the blend door you've all listed in your replies.
Although it's been a while since I replaced the heater core, my memory leads me to believe the problem started around that time. Would it be possible that I have an air pocket obstructing the flow of water in the heater core? If so, can I merely pull the heater hoses and flush with water to correct the problem?
I don't drive the truck much, less than 5K miles a year on average. However, it sure would be nice to have some heat when I do.
Need to head out to TX this weekend to pick up a trailer. Would not be a very pleasant trip with the wife freezing.
Post Fiend
Joined: May 2004
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From: Lakewood, Ohio
remove glove box, 7 screws, heater core hose after you mark them, pull out core and you will see if door works or is blocked.
every time this comes up everyone wants to replace the core and then they find a pen fell down the defrost vent and is blocking the door.
every time this comes up everyone wants to replace the core and then they find a pen fell down the defrost vent and is blocking the door.
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Fleet Owner
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From: Easton,Ks
If the problem started when you replaced the core then you probably got the heater hoses reversed, try swapping them around.
No the blend door is controlled by a **** or lever that you move by hand, what you hear is the vacuum motors opening and closing the diverter doors.
No the blend door is controlled by a **** or lever that you move by hand, what you hear is the vacuum motors opening and closing the diverter doors.
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Subford,
Switching the hoses could possibly be the answer. I'll have to look at that. Is there a quick way of telling which is which, i.e. top hose on the core should go to a specific location on the block or vice/versa?
Excuse my ignorance, but I'm a bit confused by the diverter and blend door terminology used here.
In my miniscule mind, it would seem the blend door would be operated by the temperature **** as I mentioned in the earlier post. It would seem the diverter door would be a door that diverted (or directed) the air flow between the vent, defroster, and floor duct work.
If that is correct, I can divert the air flow in any of these three directions. The door I'm hearing is opening and closing with movement of the temperature control ****.
Am I totally confused, or just not understanding the terminology correctly?
Switching the hoses could possibly be the answer. I'll have to look at that. Is there a quick way of telling which is which, i.e. top hose on the core should go to a specific location on the block or vice/versa?
Excuse my ignorance, but I'm a bit confused by the diverter and blend door terminology used here.
In my miniscule mind, it would seem the blend door would be operated by the temperature **** as I mentioned in the earlier post. It would seem the diverter door would be a door that diverted (or directed) the air flow between the vent, defroster, and floor duct work.
If that is correct, I can divert the air flow in any of these three directions. The door I'm hearing is opening and closing with movement of the temperature control ****.
Am I totally confused, or just not understanding the terminology correctly?
Fleet Owner
Joined: Aug 2005
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From: Easton,Ks
[QUOTE=Jed 16265In my miniscule mind, it would seem the blend door would be operated by the temperature **** as I mentioned in the earlier post. It would seem the diverter door would be a door that diverted (or directed) the air flow between the vent, defroster, and floor duct work.
If that is correct, I can divert the air flow in any of these three directions. The door I'm hearing is opening and closing with movement of the temperature control ****.
[/QUOTE]You are correct.
Maybe these two links will help you.
Doors:
http://i54.photobucket.com/albums/g9.../ACVacuum3.gif
Hoses for a 1994 351, you did not say what size engine so I hope I guessed right:
http://i54.photobucket.com/albums/g91/subford/Engine/94351Heaterhose.gif
If that is correct, I can divert the air flow in any of these three directions. The door I'm hearing is opening and closing with movement of the temperature control ****.
[/QUOTE]You are correct.
Maybe these two links will help you.
Doors:
http://i54.photobucket.com/albums/g9.../ACVacuum3.gif
Hoses for a 1994 351, you did not say what size engine so I hope I guessed right:
http://i54.photobucket.com/albums/g91/subford/Engine/94351Heaterhose.gif
Last edited by subford; Feb 14, 2007 at 01:18 PM.
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Quicklook, and Subford,
thanks for the information. I guess I'll be braving the cold weather in an effort to get some heat...
I'll tear into that heater core, and see what I can find out. Then go smack the wife and kid around for letting something fall into the dash board (lol.)
By the way Subford, I've got the 460 (7.5) in the truck, but appreciate the links.
thanks for the information. I guess I'll be braving the cold weather in an effort to get some heat...
I'll tear into that heater core, and see what I can find out. Then go smack the wife and kid around for letting something fall into the dash board (lol.)
By the way Subford, I've got the 460 (7.5) in the truck, but appreciate the links.
Fleet Owner
Joined: Aug 2005
Posts: 23,666
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From: Easton,Ks
Originally Posted by Jed 16265
Quicklook, and Subford,
thanks for the information. I guess I'll be braving the cold weather in an effort to get some heat...
I'll tear into that heater core, and see what I can find out. Then go smack the wife and kid around for letting something fall into the dash board (lol.)
By the way Subford, I've got the 460 (7.5) in the truck, but appreciate the links.
thanks for the information. I guess I'll be braving the cold weather in an effort to get some heat...
I'll tear into that heater core, and see what I can find out. Then go smack the wife and kid around for letting something fall into the dash board (lol.)
By the way Subford, I've got the 460 (7.5) in the truck, but appreciate the links.
If you want 460 images I can put them up.
Fleet Owner
Joined: Aug 2005
Posts: 23,666
Likes: 301
From: Easton,Ks