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Author Topic: A/C/heater Control unit differences  (Read 716 times)

firedome

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A/C/heater Control unit differences
« on: October 16, 2009, 10:32:22 AM »



So the replacement I got for my slightly melted A/C/heater control unit
looks similar, but has some  detail differences, the original has
a metal plate cam that serves to operate a vac unit for temp control
when the lever is adjusted from cold (L side) to Warmer (Right
side).  The replacement has what appears to be a cable controller
- there's a tab off the temp lever unit, and a spring clip cable holder
at the back where the vac unit is on the original. Also the lever - cam
on the replacement activates a switch at the back that the origianl
doesn't have. Is this adaptable, a superceded part, or from a different
Mopar? The front panel looks identical, as do buttons and lever,
overall size the same mounting wise and mounting bolt placement... ???
See pics, you can see where the original
melted on the top of white plastic box part above buttons 3 & 4 in
the last pic. Maybe I can just transplant the white box part? Don't
have a Parts book yet, Sjak is sending me a burned CD of it though!!
What a guy!


firedome2009-10-16 18:17:30
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Snotty

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A/C/heater Control unit differences
« Reply #1 on: October 16, 2009, 10:12:16 PM »

Is one for "Automatic Temperature Control?"
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firedome

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A/C/heater Control unit differences
« Reply #2 on: October 17, 2009, 03:40:12 AM »

No, the mostly metal one is the original, it'd already been taken out
of the car, due to electrical issues that caused the melting I guess,
also making it so the buttons won't depress any more... Both have
identical faceplates with "Max A/C A/C Heat Def "buttons, in that
order, the "Warmer" sliding temp lever above, and the 3 fan speed
switch above that. Basic A/C and heat controller, nothing fancy. But
one seems vac operated selectors, and one by cable maybe... odd.

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Steve

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A/C/heater Control unit differences
« Reply #3 on: October 17, 2009, 04:36:09 AM »

The parts are interchangeable
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firedome

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A/C/heater Control unit differences
« Reply #4 on: October 17, 2009, 07:43:14 AM »

As a unit? then how?... the replacement unit appears to control temp by
cable, not
vacuum, there's no place for vac hoses to go, and on the the original,
the vac part
is built in, not removable,  and appear to control the
adjustment for temp, I assume by blending cold and warm air:  the
cam on the "Warmer" lever goes to the dashpot, or whatever it is, that
connects to the 2 vac lines.  Also the new one has 2 wiring
harness plugs,
where the old one has 1, the 2nd one  activates a switch when the
Temp lever is all the way L to the Cold side. The old unit doesn't have
this.

The white plastic box parts of the 2 units, which is the bad part that
melted, look as though they might interchange if I take them apart and
swap them.  So did some C bodies control temp by cable, and some
by vacuum lines, and why the switch on the one for Cold setting??


firedome2009-10-17 12:45:04
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Steve

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A/C/heater Control unit differences
« Reply #5 on: October 17, 2009, 07:50:06 AM »

No I mean put the push button controller and blower switch from the replacement into yours.  Those parts are the same.
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firedome

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A/C/heater Control unit differences
« Reply #6 on: October 17, 2009, 07:52:41 AM »

pic of switch that closes when temp lever is at left on cold



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firedome

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A/C/heater Control unit differences
« Reply #7 on: October 17, 2009, 07:55:34 AM »

pic of tab on end of temp lever and clip for cable? This is where the vac unit is on the original.

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firedome

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A/C/heater Control unit differences
« Reply #8 on: October 17, 2009, 07:57:27 AM »

vac unit on orig, where spring clip is on replacement.







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firedome

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A/C/heater Control unit differences
« Reply #9 on: October 17, 2009, 08:02:30 AM »

I see that I can interchange the button units, no problem, but just
curious if some Cs had vac  control and some cable...? wondering
what models and years.

Obviously I have wiring issues to solve too, hence the melted part!



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Steve

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« Reply #10 on: October 17, 2009, 09:08:38 AM »

The 71 was vacuum control of the heater valve and the 72 was cable.
 
Most 72's had a flow through vent system where the fan ran all the time and the compressor did too.  But I don't believe that was the case in 71.  As I recall it was an option in Plymouth then.  I think it was standard in the Polara and Monaco in 72.
 
Running that compressor all the time was a PITA
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Steve

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« Reply #11 on: October 17, 2009, 09:09:14 AM »

I'll look at that wiring when we come to yank that motor
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firedome

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A/C/heater Control unit differences
« Reply #12 on: October 17, 2009, 01:53:01 PM »

Gotcha.  Surprising that they'd change the hvac system so much
between the 2 years. I could have figgered that all out if I'd've have
the parts manuals for both years, sure be nice if all the parts manuals
were accessible online somewhere.

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Steve

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« Reply #13 on: October 17, 2009, 06:36:35 PM »

You have to remember, my first Fussie was a 71F3.  Never should have sold that car. . . .  I miss it
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firedome

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A/C/heater Control unit differences
« Reply #14 on: October 18, 2009, 04:42:57 AM »

Was that the gold 4 dr hrdtp that went to Herman's friend? I remember
seeing it on eBay, it was a beaut, and I would have bid if I had any
$.  That was before I got on here at Mfins much.

I love the virg too.



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