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HVAC Mode Control Switch (Heat a/c Vent)

This category on the website [ Switches and Wiring ] we are giving you all of the information related to the individual switches in the Buick Turbo Regal, along with the associated wiring, connector plugs, etc.

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VEHICLE APPLICATION:

Buick Regal, T-Type, Turbo T, Limited, Grand National, GNX

SWITCH NAME:

HVAC Mode Control Switch
HVAC rotary mode control switch

PURPOSE OF SWITCH:

controls the mode of the a/c system (C60 manual; and heat vent defrost options)

TURNS ON-OFF / FUNCTIONS / USED WHEN:

when you move the mode lever, it turns on the various systems

LOCATION IN VEHICLE:

interior, center of car, on dash, above radio

ORIGINAL GM PART NUMBER:

?

SWITCH / BASE COLOR:

black brass tabs

CONNECTOR PLUG COLOR (SWITCH SIDE):

n/a

WIRES ATTACHED (SWITCH SIDE):

n/a

CONNECTOR PLUG COLOR (HARNESS SIDE):

black

NUMBER OF WIRES ATTACHED (HARNESS SIDE):

4

COLOR & PURPOSE OF (HARNESS SIDE) WIRES:

AIR CONDITIONING:
(with C60 manual A/C)

MODE CONTROL:

brown “E”, goes to (junction) to a/c fuse
(connects with trunk release)

light green “C”, goes to (junction) to pressure cycling switch “B”

[2 wires on 1 terminal]
brown-white “B”, goes to heater a/c control head “D” (blower switch)
brown-white “B”, goes to blower resistor “A”

OTHER CONNECTED WIRES ON HVAC UNIT (not on all models):

brown “B” [voltage regulator], goes to (junction) to a/c fuse

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orange “B” (memory power), goes to (several junctions) to cig-clk fuse
(connects with power antenna)

gray “D” (display dim input), goes to instrument cluster lights

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black “D” (lights ground) and “E” (unit ground), goes to (junction) to ground

pink-black “H” (blower control), goes to a/c air delivery & temp control

light green-black “B” (blower control), goes to a/c blower controls (HVAC fan speed) [“D” on blower and a/c clutch control module]

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light green-black “E” (temp input), goes to a/c air delivery & temp control

black “A” (blower control), goes to a/c air delivery & temp control

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brown-white “A” (compressor power reset), goes to (junction) to blower & a/c clutch control module “C” (power reset)

purple “C” (compressor control), goes to (junction) to blower & a/c clutch control module “A” (compressor control signal)
[6 volts = on; 12 volts = off]

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PHOTOS OF SWITCH AND CONNECTED WIRES:
.

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OTHER NOTES:

labelled “heater a/c control head” on diagrams.

There are a lot of wires within the a/c unit (control head).
Some control the function (heat, a/c, etc), some control the blower speed.
Some control the function (normal, max) within the function (a/c).
Others are for the light, power/ground, etc.,

[SEE HVAC Fan Speed Control Switch]

[SEE HVAC light bulb]

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Most Turbo Buicks DO have air conditioning as an option in their Gbody Regals, but we figured we would include these photos of a “non-a/c” control head, as well as what the blower harness looks like (it’s different than the cars that have a/c), in case someone can use this info.
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Here’s all of the Switches in the Buick Turbo Regals:
(you can click these links to go direct to these posts)

* A/C High Pressure Cut-out Switch (Back of Compressor)
* A/C Pressure Cycling Switch (on Accumulator)
* A/C Pressure Line (Under Alternator)
* Blower and A/C Clutch Control Module Switch (HVAC Fan Speed Control)
* Brake Pressure Switch (in Prop Valve)
* Brake Switch (Above Brake Pedal)
* Coolant Fan Temperature Switch (Under Throttle Linkage)
* Cooling High Temperature Switch (Manifold Front Passenger Side; Idiot Light)
* Cornering Light Switch (Regal Limited Models)
* Cruise Control Switch (Lever)
* Cruise Control Brake Switch
* Defogger Control Switch (Rear Defogger Button)
* Dome Reading Lights Switch
* Door Jamb Switch (Both Sides)
* Electronic Air Conditioning Touch Climate Control (Electric Touch A/C)
* Gear Selector Switch
* Glove Box Switch (for Light)
* Hazard Switch (Emergency Flashers)
* Headlight Switch
* Headlight Dimmer Switch (High Beam)
* Hobbs Switch (Digital Dash Cars)
* Horn Button Switch
* HVAC Fan Speed Control Switch (Heater A/C Control Head Blower Switch)
* HVAC Mode Control (Heater A/C Control Head Mode Switch)
* Ignition Switch
* Ignition Key Warning Switch
* Instrument Cluster Dimmer Switch (Dash Lights Brightness)
* Neutral Safety and Backup Light Switch
* Oil Pressure Switch
* Overtemp Hot Switch
* Park Brake Switch (Emergency Brake)
* PowerMaster Brake Switch
* Power Door Lock Switch (Both Sides)
* Power Seat Switch
* Power Window Switch (Both Sides)
* Radio Button (on/off Switch)
* Rear View Mirror Map Light Switch
* Seat Belt Switch
* Sunroof Switch (Astroroof Moonroof)
* Theft Deterrent Warning System Tamper Switches
* Trunk Light Switch
* Trunk Release Button
* Turbo Power Light Switch (Digital Dash Cars)
* Turn Signal Switch (Lever)
* Twilight Sentinel Switch (Rotary Dial)
* Under Hood Light Switch (engine bay compartment)
* Vanity Mirror Light Switch (Passenger Side Visor)
* Wiper and Washer Switch

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