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 High Pressure Line Switch
PURPOSE OF SWITCH:
monitors pressures / controls fans
TURNS ON-OFF / FUNCTIONS / USED WHEN:
in use while the air conditioning system is on
LOCATION IN VEHICLE:
on the high pressure line near the AC compressor, behind/below the alternator
ORIGINAL GM PART NUMBER:
25527510
SWITCH / BASE COLOR:
Metal
CONNECTOR PLUG COLOR (SWITCH SIDE):
black
WIRES ATTACHED (SWITCH SIDE):
n/a
CONNECTOR PLUG COLOR (HARNESS SIDE):
gray
NUMBER OF WIRES ATTACHED (HARNESS SIDE):
3
COLOR & PURPOSE OF (HARNESS SIDE) WIRES:
dark green-yellow “B” (hi speed), goes to (junction) to high speed coolant fan relay “2”
(junction also connects to coolant fan temperature switch)
dark green “A”, goes to low speed coolant fan relay “2” (which has another dark green wire that goes to ECM “D2” [coolant fan control])
black-white “C”, goes to (junction) to ground
(junction connects to other things)
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OTHER NOTES:
This is 1 of 3 switches the air conditioning system uses.
See also:
* AC High Pressure Cut-out Switch (back of compressor)
* AC Pressure Cycling Switch (on accumulator)
labelled “a/c high pressure switch” and “high pressure cut-out switch” on diagrams.
[closed above 260 psi on the “lo speed” side]
[closed above 300 psi on the “hi speed” side]
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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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