Four Seasons 78548 A/C compressor for the 2006-2009 Chevrolet Trailblazer and other vehicles pumps and pressurizes refrigerant to run the air conditioning system. This Four Seasons AC compressor is a Sanden TRSA12B design that meets or exceeds OE specifications.
- Clutch included, with a 4-groove serpentine pulley 3.875 in across
- Compatible with R134a or R1234yf systems
- Each unit is individually vacuum, pressure and helium mass spectrometer tested for leaks
- Validated to deliver performance equivalent to 100,000 miles
Quick facts
- Part: Four Seasons 78548 A/C compressor
- Fits: the 2006-2009 Chevrolet Trailblazer and other vehicles
- Position: front, rear
- Condition: New
A worn compressor can show up as warm air from the vents, a noisy or slipping clutch and pulley, or oily residue around the fittings. Before buying, look over the compressor and its lines for oil stains and the pulley for damage, with the engine off and cool, because a low charge or a bad switch can produce similar symptoms. If the compressor is the cause, this unit replaces it. Opening the A/C lines is a job for a shop.
Fits
The vehicles it fits include the 2006-2009 Chevrolet Trailblazer, the 2005-2009 GMC Envoy and the 2005-2009 Saab 9-7X. Each 2006-2009 Chevrolet Trailblazer takes one compressor. If your car is not among these, find it in the "Vehicles it fits" section on this page.
Specifications
Fit and size
- Position: front, rear
- Quantity per vehicle: 1
- Outside pulley diameter: 3.875 in
- Pulley grooves: 4
- Outlet length: 98 mm
- Mounting type: Tangent Mount
Build and materials
- Compressor type: Sanden TRSA12B (Sanden/Sankyo)
- Condition: New
- Pulley belt type: Serpentine
- Refrigerant type: R134A
- Compatible oil type: PAG 46
- Clutch: included
- Coil voltage: 12 V DC
- Switch: heat sensor, included
- Connector type: Pin
- Country of origin: Mexico
In the box
One A/C compressor with its clutch and heat sensor switch. Mounting hardware is not included, so plan on new mounting bolts rather than reusing the old ones.
Installation notes
- Comes pre-charged with 3 ounces of PAG oil, which reduces install time.
- Includes the O-rings and sealing washers required to install it: one 24355 and one 24354.
Frequently Asked Questions
Is this the right ac compressor for a 2005-2009 GMC Envoy?
Yes. Four Seasons 78548 fits the 2005-2009 GMC Envoy, and each vehicle takes one compressor.
Are O-rings included with the 78548 A/C compressor?
Yes. This compressor comes with one sealing washer 24355 and one sealing washer 24354 for installation. Mounting hardware is not included.
Which refrigerant and oil does this compressor use?
Four Seasons 78548 is pre-charged with 3 ounces of PAG oil and works with R134a or R1234yf systems. The compatible oil type is PAG 46.
What pulley does the 78548 compressor have?
This 78548 compressor has a 4-groove serpentine pulley measuring 3.875 in across the outside, and the clutch is included.
How is this Four Seasons compressor tested for leaks?
Each one is tested individually with vacuum, pressure and helium mass spectrometer checks for leaks. It is also validated to performance equal to 100,000 miles.
