1990 Pontiac Firebird HVAC Heater Hoses
Save up to 40% on original replacement 1990 Pontiac Firebird HVAC Heater Hoses. Navigate our online catalogue to find HVAC Heater Hoses and other parts designed specifically to fit a 1990 Pontiac Firebird.
HVAC Heater Hose - Pipe-1 To Valve
$17.78
$16.81
10+ In Stock
Ships: Monday Sep. 22nd
Pick-Up: Ready in 1 Hour Monday Sep. 22nd
Pick-Up: Ready in 1 Hour Monday Sep. 22nd
Condition: New
Required Per Vehicle: 3
Required Per Vehicle: 3
Made in USA
Vehicle fitment:
Engine Base: 3.1L 189ci V6 (3.50x3.31; 89.0x84.0);
Engine Base: 3.1L 189ci V6 (3.50x3.31; 89.0x84.0);
Vehicle Fitment Notes:
W/A.C.
W/A.C.
HVAC Heater Hose - Pipe-2 To Valve
$17.69
$18.15
10+ In Stock
Ships: Monday Sep. 22nd
Pick-Up: Ready in 1 Hour Monday Sep. 22nd
Pick-Up: Ready in 1 Hour Monday Sep. 22nd
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 3.1L 189ci V6 (3.50x3.31; 89.0x84.0);
Engine Base: 3.1L 189ci V6 (3.50x3.31; 89.0x84.0);
Vehicle Fitment Notes:
W/A.C.
W/A.C.
HVAC Heater Hose - Throttle Body To Engine
$15.17
$14.14
Limited Stock
Ships: Monday Sep. 22nd
Pick-Up: Ready in 1 Hour Monday Sep. 22nd
Pick-Up: Ready in 1 Hour Monday Sep. 22nd
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 3.1L 189ci V6 (3.50x3.31; 89.0x84.0);
Engine Base: 3.1L 189ci V6 (3.50x3.31; 89.0x84.0);
HVAC Heater Hose - Heater To Pipe-1
$20.51
$20.79
Limited Stock
Ships: Monday Sep. 22nd
Pick-Up: Ready in 1 Hour Monday Sep. 22nd
Pick-Up: Ready in 1 Hour Monday Sep. 22nd
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 3.1L 189ci V6 (3.50x3.31; 89.0x84.0);
Engine Base: 3.1L 189ci V6 (3.50x3.31; 89.0x84.0);
HVAC Heater Hose - Heater To Pipe
$26.44
$22.19
Limited Stock
Ships: Monday Sep. 22nd
Pick-Up: Ready in 1 Hour Monday Sep. 22nd
Pick-Up: Ready in 1 Hour Monday Sep. 22nd
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 5.0L 305ci V8 (3.74x3.48; 94.9x88.4);
Engine Base: 5.0L 305ci V8 (3.74x3.48; 94.9x88.4);
Vehicle Fitment Notes:
W/O A.C.
W/O A.C.
HVAC Heater Hose - Heater To Pipe
$26.44
$22.19
Limited Stock
Ships: Monday Sep. 22nd
Pick-Up: Ready in 1 Hour Monday Sep. 22nd
Pick-Up: Ready in 1 Hour Monday Sep. 22nd
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 5.7L 350ci V8 (4.00x3.48; 101.6x88.5);
Engine Base: 5.7L 350ci V8 (4.00x3.48; 101.6x88.5);
Vehicle Fitment Notes:
W/O A.C.
W/O A.C.
HVAC Heater Hose - Heater To Valve
$26.44
$22.19
Limited Stock
Ships: Monday Sep. 22nd
Pick-Up: Ready in 1 Hour Monday Sep. 22nd
Pick-Up: Ready in 1 Hour Monday Sep. 22nd
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 5.0L 305ci V8 (3.74x3.48; 94.9x88.4);
Engine Base: 5.0L 305ci V8 (3.74x3.48; 94.9x88.4);
Vehicle Fitment Notes:
W/A.C.
W/A.C.
HVAC Heater Hose - Heater To Valve
$26.44
$22.19
Limited Stock
Ships: Monday Sep. 22nd
Pick-Up: Ready in 1 Hour Monday Sep. 22nd
Pick-Up: Ready in 1 Hour Monday Sep. 22nd
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 5.7L 350ci V8 (4.00x3.48; 101.6x88.5);
Engine Base: 5.7L 350ci V8 (4.00x3.48; 101.6x88.5);
Vehicle Fitment Notes:
W/A.C.
W/A.C.
HVAC Heater Hose - Heater To Pipe
$17.76
$18.97
Limited Stock
Ships: Monday Sep. 22nd
Pick-Up: Ready in 1 Hour Monday Sep. 22nd
Pick-Up: Ready in 1 Hour Monday Sep. 22nd
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 5.0L 305ci V8 (3.74x3.48; 94.9x88.4);
Engine Base: 5.0L 305ci V8 (3.74x3.48; 94.9x88.4);
Vehicle Fitment Notes:
W/A.C.
W/A.C.
HVAC Heater Hose - Heater To Pipe
$17.76
$18.97
Limited Stock
Ships: Monday Sep. 22nd
Pick-Up: Ready in 1 Hour Monday Sep. 22nd
Pick-Up: Ready in 1 Hour Monday Sep. 22nd
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 5.7L 350ci V8 (4.00x3.48; 101.6x88.5);
Engine Base: 5.7L 350ci V8 (4.00x3.48; 101.6x88.5);
Vehicle Fitment Notes:
W/A.C.
W/A.C.
HVAC Heater Hose - Heater To Pipe-2
$17.76
$18.97
Limited Stock
Ships: Monday Sep. 22nd
Pick-Up: Ready in 1 Hour Monday Sep. 22nd
Pick-Up: Ready in 1 Hour Monday Sep. 22nd
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 3.1L 189ci V6 (3.50x3.31; 89.0x84.0);
Engine Base: 3.1L 189ci V6 (3.50x3.31; 89.0x84.0);
HVAC Heater Hose - Heater To Pipe-1
$16.25
Limited Stock
Ships: Same or Next Business Day
Pick-Up: Same Business Day (Order before 12pm)
Pick-Up: Same Business Day (Order before 12pm)
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 5.7L 350ci V8 (4.00x3.48; 101.6x88.5);
Engine Base: 5.7L 350ci V8 (4.00x3.48; 101.6x88.5);
Vehicle Fitment Notes:
Cut To Fit
Cut To Fit
HVAC Heater Hose - Heater To Pipe-2
$16.25
Limited Stock
Ships: Same or Next Business Day
Pick-Up: Same Business Day (Order before 12pm)
Pick-Up: Same Business Day (Order before 12pm)
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 3.1L 189ci V6 (3.50x3.31; 89.0x84.0);
Engine Base: 3.1L 189ci V6 (3.50x3.31; 89.0x84.0);
Vehicle Fitment Notes:
W/ AC Cut to Fit
W/ AC Cut to Fit
HVAC Heater Hose - Heater To Pipe-2
$16.25
Limited Stock
Ships: Same or Next Business Day
Pick-Up: Same Business Day (Order before 12pm)
Pick-Up: Same Business Day (Order before 12pm)
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 3.1L 189ci V6 (3.50x3.31; 89.0x84.0);
Engine Base: 3.1L 189ci V6 (3.50x3.31; 89.0x84.0);
Vehicle Fitment Notes:
w/o AC Cut to Fit
w/o AC Cut to Fit
HVAC Heater Hose - Heater To Pipe-2
$26.02
Limited Stock
Ships: Same or Next Business Day
Pick-Up: Same Business Day (Order before 12pm)
Pick-Up: Same Business Day (Order before 12pm)
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 5.0L 305ci V8 (3.74x3.48; 94.9x88.4); Engine VIN: F;
Engine Base: 5.0L 305ci V8 (3.74x3.48; 94.9x88.4); Engine VIN: F;
Vehicle Fitment Notes:
Exc AC
Exc AC
HVAC Heater Hose - Heater To Pipe-2
$26.02
Limited Stock
Ships: Same or Next Business Day
Pick-Up: Same Business Day (Order before 12pm)
Pick-Up: Same Business Day (Order before 12pm)
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 5.7L 350ci V8 (4.00x3.48; 101.6x88.5);
Engine Base: 5.7L 350ci V8 (4.00x3.48; 101.6x88.5);
Vehicle Fitment Notes:
Exc. AC
Exc. AC
HVAC Heater Hose - Heater To Valve
$26.02
Limited Stock
Ships: Same or Next Business Day
Pick-Up: Same Business Day (Order before 12pm)
Pick-Up: Same Business Day (Order before 12pm)
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 5.0L 305ci V8 (3.74x3.48; 94.9x88.4); Engine VIN: F;
Engine Base: 5.0L 305ci V8 (3.74x3.48; 94.9x88.4); Engine VIN: F;
Vehicle Fitment Notes:
w/AC
w/AC
HVAC Heater Hose - Heater To Valve
$26.02
Limited Stock
Ships: Same or Next Business Day
Pick-Up: Same Business Day (Order before 12pm)
Pick-Up: Same Business Day (Order before 12pm)
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 5.7L 350ci V8 (4.00x3.48; 101.6x88.5);
Engine Base: 5.7L 350ci V8 (4.00x3.48; 101.6x88.5);
Vehicle Fitment Notes:
w/ AC
w/ AC
HVAC Heater Hose - Heater To Pipe-1
$16.17
Limited Stock
Ships: Same or Next Business Day
Pick-Up: Same Business Day (Order before 12pm)
Pick-Up: Same Business Day (Order before 12pm)
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 3.1L 189ci V6 (3.50x3.31; 89.0x84.0);
Engine Base: 3.1L 189ci V6 (3.50x3.31; 89.0x84.0);
Vehicle Fitment Notes:
w/ AC
w/ AC
HVAC Heater Hose - Heater To Pipe-1
$16.17
Limited Stock
Ships: Same or Next Business Day
Pick-Up: Same Business Day (Order before 12pm)
Pick-Up: Same Business Day (Order before 12pm)
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 3.1L 189ci V6 (3.50x3.31; 89.0x84.0);
Engine Base: 3.1L 189ci V6 (3.50x3.31; 89.0x84.0);
Vehicle Fitment Notes:
w/o AC
w/o AC
HVAC Heater Hose - Heater To Intake Manifold
$16.17
Limited Stock
Ships: Same or Next Business Day
Pick-Up: Same Business Day (Order before 12pm)
Pick-Up: Same Business Day (Order before 12pm)
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 5.0L 305ci V8 (3.74x3.48; 94.9x88.4); Engine VIN: E;
Engine Base: 5.0L 305ci V8 (3.74x3.48; 94.9x88.4); Engine VIN: E;
Vehicle Fitment Notes:
Exc AC
Exc AC
HVAC Heater Hose - Valve To Pipe-1
$10.52
In Stock
Ships: Same or Next Business Day
Pick-Up: Same Business Day (Order before 12pm)
Pick-Up: Same Business Day (Order before 12pm)
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 3.1L 189ci V6 (3.50x3.31; 89.0x84.0);
Engine Base: 3.1L 189ci V6 (3.50x3.31; 89.0x84.0);
Vehicle Fitment Notes:
W/ AC Cut to Fit
W/ AC Cut to Fit
HVAC Heater Hose - Valve To Pipe-2
$13.17
10+ In Stock
Ships: Same or Next Business Day
Pick-Up: Same Business Day (Order before 12pm)
Pick-Up: Same Business Day (Order before 12pm)
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 3.1L 189ci V6 (3.50x3.31; 89.0x84.0);
Engine Base: 3.1L 189ci V6 (3.50x3.31; 89.0x84.0);
Vehicle Fitment Notes:
W/ AC Cut to Fit
W/ AC Cut to Fit
HVAC Heater Hose - Heater To Valve
$59.72
10+ In Stock
Ships: Same or Next Business Day
Pick-Up: Same Business Day (Order before 12pm)
Pick-Up: Same Business Day (Order before 12pm)
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 5.0L 305ci V8 (3.74x3.48; 94.9x88.4); Engine VIN: E;
Engine Base: 5.0L 305ci V8 (3.74x3.48; 94.9x88.4); Engine VIN: E;
Vehicle Fitment Notes:
W/ AC 5/8" x 24"
W/ AC 5/8" x 24"
HVAC Heater Hose - Pipe-1 To Radiator
$59.72
10+ In Stock
Ships: Same or Next Business Day
Pick-Up: Same Business Day (Order before 12pm)
Pick-Up: Same Business Day (Order before 12pm)
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 5.7L 350ci V8 (4.00x3.48; 101.6x88.5);
Engine Base: 5.7L 350ci V8 (4.00x3.48; 101.6x88.5);
Vehicle Fitment Notes:
5/8" x 36"
5/8" x 36"
HVAC Heater Hose - Valve To Pipe-3
$59.72
10+ In Stock
Ships: Same or Next Business Day
Pick-Up: Same Business Day (Order before 12pm)
Pick-Up: Same Business Day (Order before 12pm)
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 3.1L 189ci V6 (3.50x3.31; 89.0x84.0);
Engine Base: 3.1L 189ci V6 (3.50x3.31; 89.0x84.0);
Vehicle Fitment Notes:
W/ AC 5/8" x 4"
W/ AC 5/8" x 4"
HVAC Heater Hose - Valve To Throttle Body
$59.72
10+ In Stock
Ships: Same or Next Business Day
Pick-Up: Same Business Day (Order before 12pm)
Pick-Up: Same Business Day (Order before 12pm)
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 5.0L 305ci V8 (3.74x3.48; 94.9x88.4); Engine VIN: F;
Engine Base: 5.0L 305ci V8 (3.74x3.48; 94.9x88.4); Engine VIN: F;
Vehicle Fitment Notes:
w/ AC 5/8" x 6"
w/ AC 5/8" x 6"
HVAC Heater Hose - Valve To Throttle Body
$59.72
10+ In Stock
Ships: Same or Next Business Day
Pick-Up: Same Business Day (Order before 12pm)
Pick-Up: Same Business Day (Order before 12pm)
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 5.7L 350ci V8 (4.00x3.48; 101.6x88.5);
Engine Base: 5.7L 350ci V8 (4.00x3.48; 101.6x88.5);
Vehicle Fitment Notes:
w/ AC 5/8" x 6"
w/ AC 5/8" x 6"
HVAC Heater Hose - Pipe-1 To Radiator
$71.82
10+ In Stock
Ships: Same or Next Business Day
Pick-Up: Same Business Day (Order before 12pm)
Pick-Up: Same Business Day (Order before 12pm)
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 5.0L 305ci V8 (3.74x3.48; 94.9x88.4);
Engine Base: 5.0L 305ci V8 (3.74x3.48; 94.9x88.4);
Vehicle Fitment Notes:
3/4" x 37"
3/4" x 37"
HVAC Heater Hose - Pipe To Pipe
$11.17
$10.40
Out of Stock
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 3.1L 189ci V6 (3.50x3.31; 89.0x84.0);
Engine Base: 3.1L 189ci V6 (3.50x3.31; 89.0x84.0);
Vehicle Fitment Notes:
W/O A.C.
W/O A.C.
HVAC Heater Hose - Valve To Intake Manifold
$22.81
$17.22
Out of Stock
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 5.0L 305ci V8 (3.74x3.48; 94.9x88.4);
Engine Base: 5.0L 305ci V8 (3.74x3.48; 94.9x88.4);
Vehicle Fitment Notes:
w/A.C., w/o TPI
w/A.C., w/o TPI
HVAC Heater Hose - Valve To Intake Manifold
$22.81
$17.22
Out of Stock
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 5.7L 350ci V8 (4.00x3.48; 101.6x88.5);
Engine Base: 5.7L 350ci V8 (4.00x3.48; 101.6x88.5);
Vehicle Fitment Notes:
w/A.C., w/o TPI
w/A.C., w/o TPI
HVAC Heater Hose - Heater To Intake Manifold
$21.08
$17.89
Out of Stock
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 5.0L 305ci V8 (3.74x3.48; 94.9x88.4); Engine VIN: E;
Engine Base: 5.0L 305ci V8 (3.74x3.48; 94.9x88.4); Engine VIN: E;
Vehicle Fitment Notes:
W/O A.C.
W/O A.C.
HVAC Heater Hose - Pipe To Water Pump
$31.41
$26.90
Out of Stock
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 3.1L 189ci V6 (3.50x3.31; 89.0x84.0);
Engine Base: 3.1L 189ci V6 (3.50x3.31; 89.0x84.0);
HVAC Heater Hose - Pipe To Valve
$22.76
$19.31
Out of Stock
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 5.0L 305ci V8 (3.74x3.48; 94.9x88.4);
Engine Base: 5.0L 305ci V8 (3.74x3.48; 94.9x88.4);
Vehicle Fitment Notes:
W/A.C.
W/A.C.
HVAC Heater Hose - Pipe To Valve
$22.76
$19.31
Out of Stock
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 5.7L 350ci V8 (4.00x3.48; 101.6x88.5);
Engine Base: 5.7L 350ci V8 (4.00x3.48; 101.6x88.5);
Vehicle Fitment Notes:
W/A.C.
W/A.C.
HVAC Heater Hose - Heater Hose
Call for Pricing
Out of Stock
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 5.0L 305ci V8 (3.74x3.48; 94.9x88.4);
Engine Base: 5.0L 305ci V8 (3.74x3.48; 94.9x88.4);
Vehicle Fitment Notes:
3/4 In.
3/4 In.
HVAC Heater Hose - Heater Hose
Call for Pricing
Out of Stock
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 5.7L 350ci V8 (4.00x3.48; 101.6x88.5);
Engine Base: 5.7L 350ci V8 (4.00x3.48; 101.6x88.5);
Vehicle Fitment Notes:
3/4 In.
3/4 In.
HVAC Heater Hose - Heater Hose
Call for Pricing
Out of Stock
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 5.0L 305ci V8 (3.74x3.48; 94.9x88.4);
Engine Base: 5.0L 305ci V8 (3.74x3.48; 94.9x88.4);
Vehicle Fitment Notes:
5/8 In.
5/8 In.
HVAC Heater Hose - Heater Hose
Call for Pricing
Out of Stock
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 5.7L 350ci V8 (4.00x3.48; 101.6x88.5);
Engine Base: 5.7L 350ci V8 (4.00x3.48; 101.6x88.5);
Vehicle Fitment Notes:
5/8 In.
5/8 In.
HVAC Heater Hose - Pipe-1 To Valve
$17.65
Out of Stock
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 5.0L 305ci V8 (3.74x3.48; 94.9x88.4);
Engine Base: 5.0L 305ci V8 (3.74x3.48; 94.9x88.4);
Vehicle Fitment Notes:
w/ AC
w/ AC
HVAC Heater Hose - Pipe-1 To Valve
$17.65
Out of Stock
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 5.7L 350ci V8 (4.00x3.48; 101.6x88.5);
Engine Base: 5.7L 350ci V8 (4.00x3.48; 101.6x88.5);
Vehicle Fitment Notes:
W/ AC Cut to Fit
W/ AC Cut to Fit
HVAC Heater Hose - Pipe-2 To Water Pump
$27.11
Out of Stock
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 3.1L 189ci V6 (3.50x3.31; 89.0x84.0);
Engine Base: 3.1L 189ci V6 (3.50x3.31; 89.0x84.0);
HVAC Heater Hose - Valve To Intake Manifold
Call for Pricing
Out of Stock
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 5.0L 305ci V8 (3.74x3.48; 94.9x88.4); Engine VIN: E;
Engine Base: 5.0L 305ci V8 (3.74x3.48; 94.9x88.4); Engine VIN: E;
Vehicle Fitment Notes:
w/ AC
w/ AC
HVAC Heater Hose - Pipe-1 To Pipe-2
Call for Pricing
Out of Stock
Condition: New
Required Per Vehicle: 1
Required Per Vehicle: 1
Vehicle fitment:
Engine Base: 3.1L 189ci V6 (3.50x3.31; 89.0x84.0);
Engine Base: 3.1L 189ci V6 (3.50x3.31; 89.0x84.0);
Vehicle Fitment Notes:
w/o AC
w/o AC