Heater problems for my '65
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New User
Joined: Dec 2012
Posts: 11
Likes: 0
From: Long Island
Heater problems for my '65
New guy here...and new to the Ford world in general....just picked up my lovely '65 F100 long bed and she's got a heater issue. The motor never runs hot, and the heater blower runs perfect on both speeds, along with all the flapper doors operating as they should. Problem is, even after replacing the thermostat, warm air never comes out. It's always cold. I have the deluxe heater, and from what I've read, the right hand **** on the under dash panel is the temp control for the deluxe model. Could the heater core be to blame? I just don't feel like paying $150 just to have the dealer diagnose it and then another god knows how much for labor charges. I thank everyone in advance of their knowledge and advice. I love my new truck and I'm looking forward to spending a lot of time with her (in a warm cab preferably)
Senior User
Joined: Dec 2007
Posts: 275
Likes: 1
From: Blue Ridge Mtn Va
I am shooting from the hip here, I have NOT taken my heater apart. BUT I have fixed many things on my truck, That I did not know how to do. THANKS TO GUYS HERE!!!!!!!!!! Take pictures , notes and fix it yourself, It's part of the pride of ownership. although I did replace one on my 85 250 , it wasn't that bad.
Lead Driver
Joined: Oct 2004
Posts: 8,062
Likes: 35
From: Central Oregon
Welcome to the site; check to see if your heater control valve is opening. It will be on the fender well on the passenger side, in line of the heater hose. If it is open and closing ok, pull the hoses loose and blow though them to see if you have a pugged core. What temp stat did you install?
Fleet Mechanic
Joined: May 2012
Posts: 1,724
Likes: 1
From: peru kansas
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i agree wholeheartedly with post above sounds like an issue with the valve being rusted shut or the core is plugged you should (if its like my 66) be able to pull your heater **** out about 2"-3" and it is that wire that operates the ball valve... another thing which i have seen is if it has been sitting for a while a mouse or rat will build a nest in there and all you have to do is disassemble and clean it is pretty straightforward to remove heater in these trucks 3 little 7/16" nuts and remove the heater hose's and as you remove it there are a few wires which are easy to remove pretty easy..... also a dumb question but i see it alot are the heater hoses even hooked up a quite often if the heater core was leaking the P.O. might have just looped them back into themselves and no fluid is running through the core at all good luck
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New User
Joined: Dec 2012
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From: Long Island
Not sure of the temp rating on the thermostat, it's whatever the autozone people ordered up for me...though I have noticed that the engine is running a bit cooler since the install. I took it on a 3 hour drive yesterday and realized that towards the end of the trip it started to blow a little less cold air. I'll check my hoses today for clogs. If everything else checks good, is it still possible for the core to be plugged up? And if so is it possible to clean it out? Or do I have to install a new one...
Lead Driver
Joined: Oct 2004
Posts: 8,062
Likes: 35
From: Central Oregon
Did you install the stat in the right way, it has happened. Also, just because the stat is new, does not mean that it is working, it may be stuck open. Stat goes in with the spring end into the intake.
Logistics Pro
Joined: May 2008
Posts: 3,670
Likes: 370
From: PHX AZ
New guy here...and new to the Ford world in general....just picked up my lovely '65 F100 long bed and she's got a heater issue. The motor never runs hot, and the heater blower runs perfect on both speeds, along with all the flapper doors operating as they should. Problem is, even after replacing the thermostat, warm air never comes out. It's always cold. I have the deluxe heater, and from what I've read, the right hand **** on the under dash panel is the temp control for the deluxe model. Could the heater core be to blame? I just don't feel like paying $150 just to have the dealer diagnose it and then another god knows how much for labor charges. I thank everyone in advance of their knowledge and advice. I love my new truck and I'm looking forward to spending a lot of time with her (in a warm cab preferably)
If the heater core does need to be changed just do it yourself. We can guide you thru that to save you the $$ and you will be happy you did it yourself.
It really could not be a simpler one to learn on. Don't say you CANNOT because you can.
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Logistics Pro
Joined: May 2008
Posts: 3,670
Likes: 370
From: PHX AZ
Not sure of the temp rating on the thermostat, it's whatever the autozone people ordered up for me...though I have noticed that the engine is running a bit cooler since the install. I took it on a 3 hour drive yesterday and realized that towards the end of the trip it started to blow a little less cold air. I'll check my hoses today for clogs. If everything else checks good, is it still possible for the core to be plugged up? And if so is it possible to clean it out? Or do I have to install a new one...
A couple pics of assy. Done forget the retaining clip that holds core in place.
<center>
<img src="http://img.photobucket.com/albums/v513/CalypsoCoralBoss302/1966%20F100%20427/Interior/8cf87f2b.jpg"><br/><br/>
<img src="http://img.photobucket.com/albums/v513/CalypsoCoralBoss302/1966%20F100%20427/Interior/f697b5fd.jpg"><br/><br/>
<img src="http://img.photobucket.com/albums/v513/CalypsoCoralBoss302/1966%20F100%20427/Interior/8edf10dc.jpg">
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</center>
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Thread Starter
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New User
Joined: Dec 2012
Posts: 11
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From: Long Island
I did install the stat spring side into the intake, and the temp needle moves, so that part seems to be working fine...I'm heading out shortly to look everything over again and see what I can find. Thank you for the photos
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New User
Joined: Dec 2012
Posts: 11
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From: Long Island
So both heater hoses are cold....I even loosened them at the firewall to check the temp of the coolant and yes, it's cold too. I'm guessing the hose from the top of the intake that also has the inline ball valve is the supply hose and the one going to the water pump is the return? I thought maybe the temp rating for the thermostat was too low at first, but am i wrong for thinking that doesn't matter? The engine will get hot regardless of what the thermostat does, all it does is allow the hot liquid to reach the radiator to get cooled, right? I'm not sure which course of action to take next. All I know is that both hoses have cold coolant in them. The truck has been running for a half hour.
Tuned
Joined: Nov 2012
Posts: 410
Likes: 21
From: Longmont
hey guys I don't mean to steer away from topic but I have some type of coolant leak that drips from around my heater box to the passenger side floorboard. What is this? I dont even need a heater. should I take it out or why is coolant leaking...so confused.
Logistics Pro
Joined: May 2008
Posts: 3,670
Likes: 370
From: PHX AZ
So both heater hoses are cold....I even loosened them at the firewall to check the temp of the coolant and yes, it's cold too. I'm guessing the hose from the top of the intake that also has the inline ball valve is the supply hose and the one going to the water pump is the return? I thought maybe the temp rating for the thermostat was too low at first, but am i wrong for thinking that doesn't matter? The engine will get hot regardless of what the thermostat does, all it does is allow the hot liquid to reach the radiator to get cooled, right? I'm not sure which course of action to take next. All I know is that both hoses have cold coolant in them. The truck has been running for a half hour.
If heater has been inop for a long time expect to replace heater core anyway. Like last poster his heater core is leaking.
Logistics Pro
Joined: May 2008
Posts: 3,670
Likes: 370
From: PHX AZ
Your heater core is leaking. Replace with copper brass as the aluminum ones are junk and lines too short. Should be 29.00 to 60.00 max. for heater core
Logistics Pro
Joined: May 2008
Posts: 3,670
Likes: 370
From: PHX AZ
192 or 180 would be fine for your location.. prob the 192