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A/C vacuum actuator motors
#1
Having pulled out my A/C for refurb i have found 2 vacuum motors. One has "OK12" stamped on it and the other has "OK14" stamped on it. Both motors look the same.
Are both vacuum motors the same? and do the same job in differant places

Steve
1971 Grandé
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#2
I believe one of them is a two stage vacuum motor. Go to the Classic Auto Air website to download a catalog specific to 71-73 Mustangs. I've used them several times with very good results. Chuck
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#3
(07-11-2018, 09:34 AM)Pegleg Wrote: Having pulled out my A/C for refurb i have found 2 vacuum motors. One has "OK12" stamped on it and the other has "OK14" stamped on it. Both motors look the same.
Are both vacuum motors the same? and do the same job in different places

As you face the airbox installed in the car, there are four vacuum actuators on the A/C air box. On near the vent hole on the right end. One in the left center and a two stage on left side actually attached to the blower motor casing and another single stage on the opposite side of the blower housing..


[Image: 73_Mustang_AC_Heater_Box.jpg]

1973 H Code Convertible - Medium Copper Metallic - June 8, 1973, Built Ford Marketing Sales Vehicle
[Image: DSC_0266xsm.jpg]
[Image: satellite.png] Proud Space Junk Award Winner!












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#4
(07-11-2018, 10:13 AM)c9zx Wrote: I believe one of them is a two stage vacuum motor. Go to the Classic Auto Air website to download a catalog specific to 71-73 Mustangs. I've used them several times with very good results. Chuck

+1 On Classic Auto Air.  Great resources online and in person. 
BTW- be very careful when dealing with the vacuum switch on your heater control as they become very brittle with age.  Yep, that was the voice of expeience!  whistling

"A really great man is known by three signs-generosity in the design, humanity in the execution, moderation in success." -Otto VanBismark

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#5
(07-11-2018, 01:19 PM)rackerm Wrote:
(07-11-2018, 09:34 AM)Pegleg Wrote: Having pulled out my A/C for refurb i have found 2 vacuum motors. One has "OK12" stamped on it and the other has "OK14" stamped on it. Both motors look the same.
Are both vacuum motors the same? and do the same job in differant places

As you face the airbox installed in the car, there are three vacuum actuators on the A/C air box. On near the vent hole on the right end. One in the left center and a two stage on left side actually attached to the blower motor casing.


[Image: 73_Mustang_AC_Heater_Box.jpg]

Thanks Rakerm. The blower motor in still in situ so i still got to remove that one. Is that blower motor held by 2 screws?

Steve
1971 Grandé
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#6
(07-11-2018, 03:50 PM)Pegleg Wrote:
(07-11-2018, 01:19 PM)rackerm Wrote:
(07-11-2018, 09:34 AM)Pegleg Wrote: Having pulled out my A/C for refurb i have found 2 vacuum motors. One has "OK12" stamped on it and the other has "OK14" stamped on it. Both motors look the same.
Are both vacuum motors the same? and do the same job in differant places

As you face the airbox installed in the car, there are three vacuum actuators on the A/C air box. On near the vent hole on the right end. One in the left center and a two stage on left side actually attached to the blower motor casing.


[Image: 73_Mustang_AC_Heater_Box.jpg]

Thanks Rakerm. The blower motor in still in situ so i still got to remove that one. Is that blower motor held by 2 screws?
I dont recall exactly how many bolts/mounts, but from the pictures I see two.
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#7
(07-11-2018, 08:16 PM)rackerm Wrote:
(07-11-2018, 03:50 PM)Pegleg Wrote:
(07-11-2018, 01:19 PM)rackerm Wrote: As you face the airbox installed in the car, there are three vacuum actuators on the A/C air box. On near the vent hole on the right end. One in the left center and a two stage on left side actually attached to the blower motor casing.


[Image: 73_Mustang_AC_Heater_Box.jpg]

Thanks Rakerm. The blower motor in still in situ so i still got to remove that one. Is that blower motor held by 2 screws?
I dont recall exactly how many bolts/mounts, but from the pictures I see two.

Pictures were a great help. I stripped out centre bezel to get a better view. Found the 2 screws and removed the blower motor screws. Found 2 more vacuum motors and some repair needs to be done

[Image: 20180712_111032.jpg]


[Image: 20180712_111008.jpg]

Steve
1971 Grandé
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#8
Well, that makes four vacuum actuators and not three as I had previously stated. Only one is a dual vacuum.

1973 H Code Convertible - Medium Copper Metallic - June 8, 1973, Built Ford Marketing Sales Vehicle
[Image: DSC_0266xsm.jpg]
[Image: satellite.png] Proud Space Junk Award Winner!












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#9
Is it an AC car?  I'm trying to figure out why I'm not blowing Cold Air, only cool (new classic air compressor and all new parts in the engine bay) I even replaced the switch that shuts off the heater hose when the AC is turned on. So, I'm thinking that there is a flap that directs the air to either the heater core or the AS coil. But haven't been able to find anything referencing this.

Sorry for the Hi-Jack.

73 ragtop, 1999 Mustang Bright Atlantic Blue Paint, Phoenix Engine 302-335HP,  Edelbrock Carb & Performer manifold; c4 with 2000 stall and shiftkit; 3:55 auburn limited slip differential, Hedman shorties; Car Chemistry Exhaust

Classic Air; Tilt Steering Wheel; 1999 Chrysler Sebring bucket Seats ; power windows;
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#10
Section 36-32 of the Ford Shop Manual describes how it all works and has good illustrations. The control knob actuates the various vacuum motors, shuts off the hot water, and turns the a/c compressor on. All it takes is failure of one item, like a leaking vacuum hose or blown fuse to keep it from functioning.



“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
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