Finally finished Fresh Air Heater installation

While changing out the engine coolant on it's two year maintenance schedule,
I finally have the cab heater working after hooking up the coolant hoses and wiring up the blower motor.

After a 45 minute drive in 31 degree weather, I'm quite impressed with it's performance.:) My feet and legs were getting really toasty.
I ended up getting too hot, so I rolled down the window some, instead of adjusting the Temp control.

A few reference photos for those who don't have the heater option in their trucks.

https://i.imgur.com/xGR9LDth.jpg
https://i.imgur.com/L00Rcl1h.jpghttps://i.imgur.com/YxXDF7jh.jpg
https://i.imgur.com/jazPLjWh.jpg

Thanks for the inspiration and pictures. I still have an NOS heater in the box in my truck. I need to get cracking on it. Good time to change the antifreeze too.

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Originally Posted by Don Cavey

Thanks for the inspiration and pictures. I still have an NOS heater in the box in my truck. I need to get cracking on it. Good time to change the antifreeze too.

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Wow
NOS heater still in box.:eek:
Whenever you get around to opening up the contents of that box, please post a good picture (with measurements) of the blower decal.

Dan, it is an almost complete kit but not in the original box. Missing was the switch. But I have one because my Dad worked in aviation (Glenn L. Martin Co. Middle River, MD) and he had a box of various non-junk (read, USA, not that country in the East) switches. I don't think there is a decal in the stuff. But it has original hoses which I will of course replace with modern construction.

My truck in Germany had a heater and it worked great even though the cab was uninsulated as you know.

The switch I used for mine is an aviation breaker switch. Lots of AN hardware too.

The heaters work very well! ����, when the floors warm up from the engine heat, that’s usually when the window goes down ��....

Lee��

WOW! what a super clean install. inspiring to me as I work on my heap.

beauty completion, very fine work, impressive restoration quality.

That unit looks quite a bit different from the J-truck unit I have in mine. Is that core housing as close to the exhaust manifold as it looks like it is in the pic?

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Originally Posted by Nailhead

That unit looks quite a bit different from the J-truck unit I have in mine. Is that core housing as close to the exhaust manifold as it looks like it is in the pic?

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The ear of the manifold flange is about 2" from the housing.
I'm using a late 60's J truck heater. I removed the defroster and fresh air vacuum motors, and modified it to accept the control cables.
https://i.imgur.com/7Rw4Ixnh.jpg


The latter FSJs 1970's-1991. used a fiber glass housing similar size and shape.

https://i.imgur.com/U43U6xCh.jpg

Looks fantastic! I always admire how clean your truck is. I was just wondering if it showed the mounting location for the blowers switch in the instructions, because on my M725 the switch is along the lower dash and to the left of the choke knob. And in my M715 it was mounted just to the right of the choke knob. Here is a pic of the dash of the M725 the day I picked it up while it was still in all it's original markings.
https://i.imgur.com/qaWVJ1j.jpg

Thanks Dave:)

That's interesting looking at your picture.
Yes, in the instructions Fig. 33-F3 Modifications for Heater Kit Installation
it shows measuring over 2" from edge and 1" up from bottom edge. and drilling a 1/2" dia. hole.

Nice job, I'm just starting on my truck. Question on the on/off fan switch; will your fan work with ignition off? The other day I was startled when my fan came on. The ignition switch off, I didn't think it worked.

WOW!!!!

If that was any cleaner of an install, I would have to believe it is photoshopped....heck...it is clean enough to believe it is now.

Super job and great pics...perfection!

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Originally Posted by ch47fly

Nice job, I'm just starting on my truck. Question on the on/off fan switch; will your fan work with ignition off? The other day I was startled when my fan came on. The ignition switch off, I didn't think it worked.

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Yes the fan is not connected through the ignition switch and will operate without the power on or the motor running. I always make a mental check to make sure I shut it off when parking my trucks to keep from leaving it on and killing the batteries. The fan motor in the one in my M715 is so quite that if there is hardly any background noise you can't hear it running. The one in the M725 is a little louder and less likely to get left on.