HVAC

[Ben Bruce aka First Born]

 

  What was the LAST year GM used ANY vacuum in the HVAC controls??

 

  Thanks

  Ben

[NTX5467]

It might depend upon which vehicle brand and model.  I know the first "stepper motor" HVAC actuators we had were on the early-introduction 1988 C/K pickups  The earlier 1990s automatic a/c systems had varying amounts of electronics in them (as in the temp sensors and blower control modules).  The actuators in the noted C/K trucks had several part number changes so they didn't "have issues" at the change of seasons (when the a/c was first used, when the defroster was first used).  I suspect that by the middle 1990s, all of the actuators were stepper motors rather than vacuum units.

 

NTX5467

[Ben Bruce aka First Born]

Thanks, Willis

  Specifically wondering about 1991 Cadillac Fleetwood.

 

  Ben

[JohnD1956]

Kinda off topic, but, to Ben; are you contemplating cramming a 91 caddy A/C unit in the 50?

Edited July 8, 2016 by JohnD1956 (see edit history)

[Ben Bruce aka First Born]

Naa, John. I believe there are easier ways to cool it down.

 My wife loves Cadillacs.  Been watching a '91.  She does not really like the next generation. But I would not want one with any vacuum in the hvac controls.

 Probably dreaming, any way. Her Alzheimer's will probably win.

 

  Ben

[JohnD1956]

She has good taste.  Do it sooner than later if at all possible.  I wish her the best!