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Old 11-17-2012, 08:52 AM   #1 (permalink)
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Default 66 heater box with a/c

I thought the factory underdash a/c unit was independent of the heating/vent system...why is there a different heater box for factor a/c cars?
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Old 11-17-2012, 09:27 AM   #2 (permalink)
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Didn't think there was a difference. Have seen two Fl. Mustangs with heater delete AND
the underdash AC.
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Old 11-17-2012, 09:28 AM   #3 (permalink)
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Default already discussed and answered

Sorry....realized this was previously discussed on a post and it appears the consensus was for 66 the heater box was the same.
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Old 11-17-2012, 09:35 AM   #4 (permalink)
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64-66 used the same heater box, A/C or non A/C cars.

In 67 when they went to integral A/C the heater was
part of the A/C box, if a 67-68 didn't have factory A/C
then a heater box very similar to 64-66 was used.
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Old 11-17-2012, 09:49 AM   #5 (permalink)
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Correct. The 64-66 heater was identical whether the car had AC or not. Oddly, this means you could operate both at the same time. I tried it one time on a miserable cold rainy day, to clear mist on the side windows. The AC stared pumping out fog!
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Old 11-17-2012, 02:18 PM   #6 (permalink)
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Quote:
Originally Posted by 22GT View Post
Correct. The 64-66 heater was identical whether the car had AC or not. Oddly, this means you could operate both at the same time. I tried it one time on a miserable cold rainy day, to clear mist on the side windows. The AC stared pumping out fog!
Putting the AC on very cold would wring moisture out of the air and drain it out the condensate tube. The heater would have to be operated in the recirculation mode with the large door on the right open and the control set to not bring in outside air. In a short time, the humidity in the cab should drop dramatically. If you brought in outside air on a rainy day, you would be fighting a losing battle and maybe that is why you saw fog.
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Old 11-17-2012, 03:00 PM   #7 (permalink)
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Quote:
Originally Posted by 65fastback6 View Post
64-66 used the same heater box, A/C or non A/C cars.

In 67 when they went to integral A/C the heater was
part of the A/C box, if a 67-68 didn't have factory A/C
then a heater box very similar to 64-66 was used.

I just had the problem of finding a 67-68 box
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Old 11-17-2012, 06:01 PM   #8 (permalink)
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Quote:
Originally Posted by silversol View Post
I just had the problem of finding a 67-68 box
Used heaters are getting scarce. Last time I was at Glazier/Nolan, a guy came in looking for one. Of course, you can always get a new one. The few junk heaters turning up these days are a pretty sorry bunch.
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Old 11-18-2012, 09:37 AM   #9 (permalink)
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The 1964 1/2 1965 boxes are different from the 1966 boxes. The earlier ones had a 3 wire heater motor, and no resistor on the front of the box. The 66 had the 2 wire motor and the resistor on the front of the box. The 67 68 also had the 2 wire and the resistor, but the heater door opens and closes up and down instead of left and right.

The back of the heater box (goes against the firewall) is the same for all 4 years, except the the 67 68 with AC, which is totally different.

Ford apparently had different suppliers for the heater boxes, as the front and back fiberglass clamshells have different recesses to attach the clips to hold the box together. The recesses have about 3/4" differenences at times.

This spring, at the Pate swap meet, I bought a total of 15 heater boxes from various sellers. Between broken fiberglass, rust, other damage, about 4 went in the trash. The rest I cleaned up, and my son sold most of them for fund raising for his Eagle Scout Project.

One guy tossed in FOR FREE 3 67 68 indash air units, in various conditions. After 3 tries on ebay, no interest, they were taken apart, the cores removed and sold for scrap, and the shells went in the trash. Kept the blower motors, as they all worked.

There is also some heater hoxes that are the same, or similar, on Comets, Falcon, Fairlanes, etc.
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