Heater Rebuild
Posting Guru
Joined: Jan 2011
Posts: 1,670
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I don't have a pic (diagram) of routing of the heater lines and fluid travel through the motor but I'm sure you could find it on line.
The 'pressure side of the heater hose lines is the one coming off the intake manifold. The return line from the heater core goes to the water pump. The heater shut off valve must be in the heater hose line coming off the intake manifold.
On a side note: I remember reading an article in a tech manual many yrs ago, that said another reason besides getting the hottest coolent to the cab heater core,,, having the valve on the pressure side coming off the intake manifold ALSO will maintain a more even heat control in the intake manifold for fuel vaporization. If I recall correctly, this is the idea: IF the shut off valve was in the return heater hose going into the intake manifold, constant intake manifold heat would vary too much when the cab heater/fan was operating. Sounds logical to me....
The 'pressure side of the heater hose lines is the one coming off the intake manifold. The return line from the heater core goes to the water pump. The heater shut off valve must be in the heater hose line coming off the intake manifold.
On a side note: I remember reading an article in a tech manual many yrs ago, that said another reason besides getting the hottest coolent to the cab heater core,,, having the valve on the pressure side coming off the intake manifold ALSO will maintain a more even heat control in the intake manifold for fuel vaporization. If I recall correctly, this is the idea: IF the shut off valve was in the return heater hose going into the intake manifold, constant intake manifold heat would vary too much when the cab heater/fan was operating. Sounds logical to me....
Posting Guru
Joined: Jan 2011
Posts: 1,670
Likes: 8
Here ya go. Autozone, 'Everco' heater control valve. #5851. $19.99 +tax. I just asked the guy for one for both my 65 & 66 - Everco # was the same. I believe it might also be listed 61-66 or later. Don't remember what he said. I had the OEM 'metal' one leak twice on each truck, SO, enough was enough. The newer one is made from ABS, it looks like, maybe - who knows - don't care. I've heard from others they have had good luck with them.
If you just MUST need the factory one, Ford dealers have them. More $, out dated part IMO.
Maybe someone that has the stock cable type in place can measure how far out from the firewall the hose needs to be cut. I'm going to be out of town and don't really want to pull the cover off. Sorry.
If you just MUST need the factory one, Ford dealers have them. More $, out dated part IMO.
Maybe someone that has the stock cable type in place can measure how far out from the firewall the hose needs to be cut. I'm going to be out of town and don't really want to pull the cover off. Sorry.
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Junior User
Joined: Mar 2013
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heater rebuild
Last edited by nerksa; May 18, 2013 at 12:20 PM. Reason: clarification
Thread Starter
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Junior User
Joined: Mar 2013
Posts: 78
Likes: 0
Heater Rebuild
Sorry to clutter up the forum with failed picture post attempts. finally got it figured out. will post more in future.
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