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Old 09-30-2020, 02:50 PM   #1
Jacques1960
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Default Arvin 74 H heater for 1938 wagon

Although our wagon spent the last 15 years in Canada, it has no heater. Iíd like to add one to extend the driving season here in Maine. The Arvin 74H looks like it might be a reasonable, period-correct choice; this said, I donít want to install without some tried and true guidance regarding dash / firewall penetrations and plumbing. Thank you.
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Old 09-30-2020, 04:01 PM   #2
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Default Re: Arvin 74 H heater for 1938 wagon




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Old 09-30-2020, 06:00 PM   #3
Jacques1960
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Default Re: Arvin 74 H heater for 1938 wagon

Exactly ! Now, how to mount and connect; have you installed one of these ?
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Old 09-30-2020, 06:11 PM   #4
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Default Re: Arvin 74 H heater for 1938 wagon

if your battery is on the firewall it makes it very difficult to install any heater--not much room. it can be installed in the center or center right, but beware if you have to remove floor boards it gets a little tight. enought about the problems take the heater and hold it up around where you might want it. do a little relationship thing so you can see what is on the other side of firewall. make a template of the mount holes and the water outlet/inlet and use this to drill holes in the firewall.
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Old 09-30-2020, 06:28 PM   #5
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Default Re: Arvin 74 H heater for 1938 wagon

Jacques, This is a correct heater in a '39 wagon I'd restored. It would fit the same in your '38 I believe and would look much more "proper" than the Arvin in my opinion.
I believe I have one of these in my stash if interested.
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Old 09-30-2020, 09:32 PM   #6
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Default Re: Arvin 74 H heater for 1938 wagon

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here's where i put the water line in mine instead of the hole in the radiator hose as recommended by ford
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Old 10-01-2020, 06:34 AM   #7
Jacques1960
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Default Re: Arvin 74 H heater for 1938 wagon

Thank you; what did you do for the return line ?
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Old 10-01-2020, 10:25 AM   #8
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Default Re: Arvin 74 H heater for 1938 wagon

There should be a port for the NPT hose hose fitting in the head next to the radiator hose for the return.Here is a link to the shut off fitting I used .


https://www.ebay.com/itm/HEATER-HOSE...QAAOSwUf9ccAZE
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Old 10-01-2020, 10:32 AM   #9
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Default Re: Arvin 74 H heater for 1938 wagon

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Old 10-01-2020, 10:47 AM   #10
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Default Re: Arvin 74 H heater for 1938 wagon

I think the Arvin heater you have is to large for a '38, I would suggest you take Kube's offer for a '39 heater..
My '36 has a '39 heater mounted on the passenger side of the firewall.
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Old 10-01-2020, 10:49 AM   #11
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Default Re: Arvin 74 H heater for 1938 wagon

Thank you; Kube & Blucar, please let me know what you have in private stock.

Merci, Monsieur Deuce
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Old 10-01-2020, 04:25 PM   #12
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Default Re: Arvin 74 H heater for 1938 wagon

Quote:
Originally Posted by Jacques1960 View Post
Thank you; what did you do for the return line ?
What is shown is the return line, the input line is connected to the head near the radiator hose.
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Old 10-01-2020, 08:14 PM   #13
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Default Re: Arvin 74 H heater for 1938 wagon

That particular Arvin will fit, IF you carefully locate the piping around the fuel pump AND manage to get it high enough for flap door to clear the shifter in reverse and second...

There is a very similar Arvin that angles in and has a chrome grate rather than the flap door. This would be a better choice.

Best choice would be the smaller 39 and 40 style unit as Kube mentioned. Although small, it puts out quite a bit of heat...you also get to take advantage on the factory 39 Ford installation guide for the "standard", which would be just right for your 38.
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Old 10-01-2020, 10:02 PM   #14
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Default Re: Arvin 74 H heater for 1938 wagon

Before I moved to So Cal in April 56 I operated my '36 in Eastern Idaho, Wyoming and Utah, in temps in the low -30's. The '39 style heater did an excellent job in my car. The heater in my car has provisions for defroster ducts, there is a little knob on the upper left of the heater box that is pulled to divert air from the passenger area, they were never hooked up, no provisions in the dash, I have seen pictures of the defroster distribution ducts on the face of the '36 cars. The feature never appealed to me.
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Old 10-02-2020, 11:35 AM   #15
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Default Re: Arvin 74 H heater for 1938 wagon

Would appreciate info on smaller heaters mentioned above as well as Ford installation instructions. Thank yoy
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Old 10-03-2020, 08:44 AM   #16
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Default Re: Arvin 74 H heater for 1938 wagon

Quote:
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Would appreciate info on smaller heaters mentioned above as well as Ford installation instructions. Thank yoy
email sent
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