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:
A/C Air Conditioning Compressor Cut-Off Switch
A/C Compressor Switch
a/c high-pressure cut-out switch
PURPOSE OF SWITCH:
allows clutch control ONLY when there is adequate pressure in the system
protects the system from over pressure
TURNS ON-OFF / FUNCTIONS / USED WHEN:
in use when Air Conditioning is on
LOCATION IN VEHICLE:
mounted on the AC compressor, back/bottom side
ORIGINAL GM PART NUMBER:
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2780448 (replacement, blue)
SWITCH / BASE COLOR:
red
blue with chrome outer housing (replacement)
CONNECTOR PLUG COLOR (SWITCH SIDE):
n/a
WIRES ATTACHED (SWITCH SIDE):
n/a
CONNECTOR PLUG COLOR (HARNESS SIDE):
black, small round connector
NUMBER OF WIRES ATTACHED (HARNESS SIDE):
2
COLOR & PURPOSE OF (HARNESS SIDE) WIRES:
black “A”, goes to a/c compressor clutch “B”
(“B” also has a wire that goes to cap/diode lead which is inside connector)
black “B”, goes to (junction) to ground
(junction connects with coolant fan)
(junction connects with other things)
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OTHER NOTES:
This is 1 of 3 switches the air conditioning system uses.
See also:
* AC Pressure Cycling Switch (on accumlator)
* AC Pressure Line (under alternator)
called “a/c high-pressure cut-out switch” on diagrams.
[switch opens above 430 psi, closes below 200 psi]
[the diode mentioned above is contained within the connector plug]
switch base color can be a variety of different colors (replacements are blue, green, etc.).
[if you need to replace this part, take it with you to the store, or try to get the same color version if ordering online!]
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PHOTOS OF SWITCH AND CONNECTED WIRES:
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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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