AIR CONDITIONING – GMC Yukon 1999 – SYSTEM WIRING DIAGRAMS

AIR CONDITIONING

5.7L

5.7L VIN R, Compressor Wiring Diagram for GMC Yukon 1999

List of elements for 5.7L VIN R, Compressor Wiring Diagram for GMC Yukon 1999:

• (engine harn, near diode)
• 22 cm from ebcm breakout)
• A/c comp fuse 10a
• A/c compressor clutch
• A/c compressor clutch relay (in underhood fuse block)
• A/c compressor cycling switch (in low pressure line, on accumulator)
• A/c control
• A/c disable
• A/c high pressure cutout switch (on a/c compressor)
• A/c low pressure cutout switch (on a/c compressor)
• A/c req
• A/c switch
• Blower switch
• Diode
• Fuse block
• G104 (top right side of cylinder head)
• G105 (right side of engine)
• Hot in run
• Hot in run or start
• Htr a/c fuse 12 25a
• Hvac control module
• Ign e fuse 10a
• Ignition
• Near egr valve breakout)
• Off
• Pnk
• S146 (eng harn, pnk
• S185
• S186
• S268 (i/p harn, behind center of dash)
• Sw sig
• Underhood fuse block
• Vehicle control module (left side of engine compt)

5.7L VIN R, Heater Wiring Diagram for GMC Yukon 1999

List of elements for 5.7L VIN R, Heater Wiring Diagram for GMC Yukon 1999:

• (behind left
• (hvac harn, 8 cm from recirc door breakout) s244
• (i/p harn, 24 cm from i/p cluster breakout)
• (right side of dash) g202
• Air temp dr sensor
• Battery
• Blower fuse 3 50a
• Blower motor (under right side of dash)
• Blower resistor (on blower motor housing)
• Blower switch
• Defogger element
• Front mode door motor (on front a/c-heater housing)
• Front temperature door motor (on front a/c-heater housing)
• Fuse block
• G200
• Ground
• High blower relay (on top of front a/c- heater blower housing)
• Hot at all times
• Hot in run
• Htr-a/c fuse 12 25a
• Hvac control module
• Ignition
• Illumination
• Interior lights system
• Mode signal
• Off
• Rear defogger system
• Recirc ctrl
• Recirculation door motor (on front a/c-heater housing)
• Red
• S243 (hvac harn, 4 cm from recirc door breakout)
• S268 (i/p harness, behind center of dash)
• S298
• Side of dash)
• Tan
• Underhood fuse/relay center

5.7L VIN R, Heater Wiring Diagram, Auxiliary for GMC Yukon 1999

List of elements for 5.7L VIN R, Heater Wiring Diagram, Auxiliary for GMC Yukon 1999:

• (aux hvac harn, near rear hvac control module)
• (front)
• (hvac harn, 8 cm from recirc door breakout) s244
• (i/p harn, 24 cm from i/p cluster breakout)
• (in front of overhead console)
• Air temp dr sensor
• Auxiliary blower motor (behind right rear wheelwell)
• Auxiliary blower motor relay, high (on auxiliary a/c plenum)
• Auxiliary blower motor relay, low (on auxiliary a/c plenum)
• Auxiliary blower motor relay, medium (on auxiliary a/c plenum)
• Auxiliary blower motor resistor (on auxiliary a/c plenum)
• Auxiliary heater control module
• Auxiliary heater control module (rear) (behind left side of dash)
• Battery
• Blower fuse 3 50a
• Blower motor (under right side of dash)
• Blower resistor (on blower motor housing)
• Blower switch
• C 1995 vftc
• Convenience center
• Defogger element
• Front mode door motor (on front a/c-heater housing)
• Front temperature door motor (on front a/c-heater housing)
• G200 (behind left side of dash)
• G202 (right side of dash)
• G400 (on right side "b" pillar, near door striker)
• Ground
• High
• High blower relay (on top of front a/c- heater blower housing)
• Hot at all times
• Hot in run
• Htr-a/c fuse 12 25a
• Hvac control module
• I/p fuse block
• Ignition
• Illumination
• Interior lights system
• Low
• Med
• Mega fuse block
• Mode signal
• Off
• Rear
• Rear defogger system
• Recirc ctrl
• Recirculation door motor (on front a/c-heater housing)
• Red
• Red e
• Rr hvac\ fuse 5 10a
• S110 (engine harness, near ebcm breakout)
• S243 (hvac harn, 4 cm from recirc door breakout)
• S268 (i/p harness, behind center of dash)
• S298
• S305
• S306
• S309
• S401 red (aux hvac harn, 13 cm from blower relay breakout)
• S410 (body harn near rr door jamb switch breakout)
• Tan

5.7L VIN R, Manual A/C Wiring Diagram for GMC Yukon 1999

List of elements for 5.7L VIN R, Manual A/C Wiring Diagram for GMC Yukon 1999:

• (engine harn, near diode)
• (engine harness, 22 cm from ebcm breakout, 7.4l)
• (engine harness, near ebcm breakout)
• (engine harness, near egr valve breakout)
• (exc 4.3 l)
• (fwd lamps harn, 5 cm from right headlamp breakout)
• (hvac harness, 4 cm from recirc door breakout)
• (i/p harn, 28 cm from cluster breakout)
• (i/p harness, behind center of dash)
• (right side
• A/c comp fuse 10a
• A/c compressor clutch
• A/c compressor clutch relay (in underhood fuse/relay center)
• A/c compressor cycling switch (in low pressure line, on accumulator)
• A/c ctrl
• A/c disable
• A/c high pressure cutout switch (on a/c compressor)
• A/c low pressure cutout switch (on a/c compressor)
• A/c req
• A/c switch
• Air temp dr sensor
• Aux fan fuse 30a
• Auxiliary cooling fan motor
• Auxiliary cooling fan relay (exc 4.3l) (in underhood fuse/relay center)
• Battery
• Blower fuse 3 50a
• Blower motor (under right side of dash)
• Blower resistor (on blower motor housing)
• Blower switch
• Defogger element
• Diode
• Front mode door motor (on front a/c-heater housing)
• Front temperature door motor (on front a/c-heater housing)
• Fuse block
• G104 (top right side of cylinder head)
• G105 (right side of engine)
• G112 (right front of engine compartment)
• G200 (behind left side of dash)
• G202
• Ground
• High blower relay (on top of front a/c-heater housing)
• Hot at all times
• Hot in run
• Hot in run or start
• Htr a/c fuse 12 25a
• Hvac control module
• Ign e fuse 10a
• Ignition
• Illumination
• Interior lights system
• Mode signal
• Of dash)
• Off
• Pnk
• Rear defogger system
• Recirc door signal
• Recirculation door motor (on front a/c-heater housing)
• Red
• Relay ctrl
• S103
• S110
• S128
• S146
• S185
• S186
• S212 (i/p harn, behind center of dash)
• S243
• S244 (hvac harn, 8 cm from recirc door breakout)
• S268
• S298
• Sw sig
• Tan
• Underhood fuse block
• Vehicle control module (left side of engine compt)

5.7L VIN R, Manual A/C Wiring Diagram, Auxiliary (1 of 2) for GMC Yukon 1999

List of elements for 5.7L VIN R, Manual A/C Wiring Diagram, Auxiliary (1 of 2) for GMC Yukon 1999:

• (hvac harn, 8 cm from recirc door breakout) s244
• (i/p harn, 24 cm from i/p cluster breakout)
• A/c compressor clutch
• A/c compressor clutch diode
• A/c compressor clutch relay (in underhood fuse box)
• A/c compressor cycling switch (on top of accumulator)
• A/c compressor high pressure cutout switch (rear of the a/c compressor)
• A/c compressor low pressure cutout switch (on top of a/c compressor)
• A/c disable
• A/c fuse 10a
• A/c request
• Air temp dr sensor
• Aux fan fuse 30a
• Auxiliary cooling fan motor
• Auxiliary cooling fan relay (in underhood fuse/relay center)
• Battery
• Blower fuse 3 50a
• Blower motor (under right side of dash)
• Blower resistor (on blower motor housing)
• Blower switch
• C 1995 vftc
• Defogger element
• Front mode door motor (on front a/c-heater housing)
• Front temperature door motor (on front a/c-heater housing)
• G104 (right rear of engine)
• G105 (right front of engine block)
• G112 (right front of engine compt)
• G200 (behind left side of dash)
• G202 (right side of dash)
• Ground
• High blower relay (on top of front a/c- heater blower housing)
• Hot at all times
• Hot in run
• Htr-a/c fuse 12 25a
• Hvac control module
• I/p fuse block
• Ign e fuse 10a
• Ignition
• Illumination
• Interior lights system
• Mode signal
• Off
• Pnk
• Rear defogger system
• Recirc ctrl
• Recirculation door motor (on front a/c-heater housing)
• Red
• Relay control
• S103 (engine harn, near starter solenoid breakout)
• S110 (engine harness, near ebcm breakout)
• S185 (in harness near diode)
• S186 (in harness near diode)
• S243 (hvac harn, 4 cm from recirc door breakout)
• S268 (i/p harness, behind center of dash)
• S298
• Switch signal
• Tan
• Underhood fuse block
• Vehicle control module (engine compartment near ebcm)

5.7L VIN R, Manual A/C Wiring Diagram, Auxiliary (2 of 2) for GMC Yukon 1999

List of elements for 5.7L VIN R, Manual A/C Wiring Diagram, Auxiliary (2 of 2) for GMC Yukon 1999:

• (in front of overhead console) auxiliary a/c & heater control module (front)
• (on auxiliary a/c-heater blower housing)
• (taillamp ext harn, near g404 breakout)
• A red
• Auxiliary a/c & heater control module (rear) (behind left side of dash)
• Auxiliary a/c & heater logic module (behind left side of dash)
• Auxiliary blower motor (behind right rear wheelwell)
• Auxiliary blower motor relay (high)
• Auxiliary blower motor relay (low) (on auxiliary a/c-heater blower housing)
• Auxiliary blower motor relay (medium)
• Auxiliary blower resistor (on top of auxiliary hvac plenum)
• Convenience center
• G400 (on right side "b" pillar)
• Ground
• High
• Hot in run
• I/p fuse block
• Low
• Med
• Mode
• Mode door motor (rear) (on rear a/c housing)
• Off
• Rear
• Red
• Red e
• Rr hvac\ fuse 5 10a
• S305 (auxiliary hvac harn, near rear auxiliary hvac control module)
• S306 (auxiliary hvac harn, near rear auxiliary hvac control module)
• S324
• S400 (auxiliary hvac harn, near auxiliary blower motor relays)
• S401 red (auxiliary hvac harn, near auxiliary blower motor relays)
• Signal
• Temp
• Temp door motor (rear) (on rear a/c housing)