Universal Air RD1800C A/C Accumulator
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Universal Air
Accumulator

Universal Air RD1800C A/C Accumulator

Brand Universal Air 6709
Center Electrode Core Material Nickel-Yttrium and Copper
Center Electrode Tip Material Platinum
Ground Configuration Standard
Ground Electrode Quantity 1
Ground Electrode Tip Design Tapered
Ground Electrode Tip Material Nickel-Yttrium
Hex Size 16
Insulator Material Ceramic
Insulator Type Non-Projected
Manufacturer Heat Range 8
Outdoor Power Equipment Application No
Package Contents Spark Plug
Pre-Gap Size 1.3
Product Length 2.996063 in
Product Width 0.712598 in
Reach 17.5
Resistance 6000
Resistor Yes
Seat Type Tapered
Short Style No
Spark Plug Type 4-Cycle
Thread Diameter 14
Product line Accumulator
Fits —164 vehicles

A/C accumulator. Helps protect the system by storing excess refrigerant and separating liquid from vapor.

Universal Air line. Part of the Accumulator product line for HVAC service and replacement.

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Free returns within 60 days if it doesn't fit when fitment is verified.
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Universal Air RD1800C A/C Accumulator

The Universal Air RD1800C is an A/C accumulator for select GM truck and SUV applications. It is used in the HVAC refrigerant circuit to help manage moisture and liquid refrigerant before it reaches the compressor. This part number is listed for multiple Chevrolet Silverado, GMC Sierra, Yukon, and Tahoe applications.

Key Features

  • A/C accumulator for HVAC refrigerant system service
  • Brand: Universal Air
  • Part number: RD1800C
  • Application-specific fitment for select Chevrolet and GMC models
  • Listed with P-nut fitting locations on supported vehicles

Fitment Details

  • Fits 2001-2006 Chevrolet Silverado 2500 HD, P-Nut Fitting at 9 O'Clock; Accumulator
  • Fits 2003-2006 Chevrolet Silverado 3500, P-Nut Fitting at 9 O'Clock; Accumulator
  • Fits 2005-2006 GMC Sierra 1500 HD, P-Nut Fitting at 9 O'Clock; Accumulator
  • Fits 2001-2003 GMC Sierra 1500 HD, P-Nut Fitting at 9 O'Clock; Accumulator
  • Fits 2003-2006 GMC Sierra 2500 HD, P-Nut Fitting at 9 O'Clock; Accumulator
  • Fits 2003-2005 Chevrolet Tahoe, P-Nut Fitting at 9 O'Clock; Accumulator
  • Fits 2005 GMC Sierra 1500, P-Nut Fitting at 9 O'Clock; Accumulator
  • Fits 2003-2005 GMC Sierra 3500, P-Nut Fitting at 9 O'Clock; Accumulator
  • Fits 2001-2005 GMC Yukon, Accumulator
  • Fits 2001-2005 GMC Yukon XL 1500, Accumulator
  • Fits 2000-2005 GMC Yukon XL 2500, Accumulator
  • Fits 2003-2004 GMC Sierra 2500, P-Nut Fitting at 9 O'Clock; Accumulator
  • Fits 2002 GMC Sierra 1500, Except Switch Port; P-Nut Fitting at 9 O'Clock; Accumulator
  • Fits 1999-2001 Chevrolet Silverado 1500, P-Nut Fitting at 9 O'Clock; Accumulator
  • Fits 1999-2001 GMC Sierra 1500, P-Nut Fitting at 7 O'Clock; P-Nut Fitting at 9 O'Clock; Accumulator
  • Fits 1999-2001 GMC Sierra 2500, P-Nut Fitting at 7 O'Clock; Accumulator

What It Helps Address

  • Moisture buildup in the A/C system
  • Liquid refrigerant reaching the compressor
  • Reduced cooling performance from a restricted or worn accumulator
  • Service needs on GM Silverado, Sierra, Tahoe, Yukon, and Yukon XL HVAC systems

Installation Notes

Verify the fitting orientation and application notes before installation, especially the P-nut fitting position and the 2002 Sierra 1500 switch-port exception. Confirm the vehicle’s A/C system configuration against the listed fitment for the correct Chevrolet Silverado, GMC Sierra, Tahoe, Yukon, or Yukon XL application. Part number RD1800C should be matched to the exact year, make, model, and notes shown above.

Quality Assurance

Universal Air RD1800C is cataloged as a dedicated A/C accumulator for the listed GM applications. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

Related reading

This part fits 164 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelSubmodelLitersCylindersFuel TypePositionNotes
2006ChevroletSilverado 2500 HD—6.0LV8GASN/AP-Nut Fitting at 9 O'Clock; Accumulator
2006ChevroletSilverado 3500LS6.0LV8GASN/AP-Nut Fitting at 9 O'Clock; Accumulator
2006ChevroletSilverado 3500LS8.1LV8GASN/AP-Nut Fitting at 9 O'Clock; Accumulator
2006ChevroletSilverado 3500LT6.0LV8GASN/AP-Nut Fitting at 9 O'Clock; Accumulator
2006ChevroletSilverado 3500LT8.1LV8GASN/AP-Nut Fitting at 9 O'Clock; Accumulator
2006ChevroletSilverado 3500WT6.0LV8GASN/AP-Nut Fitting at 9 O'Clock; Accumulator
2006ChevroletSilverado 3500WT8.1LV8GASN/AP-Nut Fitting at 9 O'Clock; Accumulator
2006GMCSierra 1500 HD————N/AP-Nut Fitting at 9 O'Clock; Accumulator
2006GMCSierra 2500 HD—6.0LV8GASN/AP-Nut Fitting at 9 O'Clock; Accumulator
2006GMCSierra 2500 HD—8.1LV8GASN/AP-Nut Fitting at 9 O'Clock; Accumulator
2005ChevroletSilverado 2500 HDBase6.0LV8GASN/AP-Nut Fitting at 9 O'Clock; Accumulator
2005ChevroletSilverado 2500 HDBase6.0LV8CNGN/AP-Nut Fitting at 9 O'Clock; Accumulator
2005ChevroletSilverado 2500 HDLS6.0LV8GASN/AP-Nut Fitting at 9 O'Clock; Accumulator
2005ChevroletSilverado 2500 HDLS6.0LV8CNGN/AP-Nut Fitting at 9 O'Clock; Accumulator
2005ChevroletSilverado 2500 HDLT6.0LV8GASN/AP-Nut Fitting at 9 O'Clock; Accumulator
2005ChevroletSilverado 3500—6.0LV8GASN/AP-Nut Fitting at 9 O'Clock; Accumulator
2005ChevroletSilverado 3500—6.0LV8CNGN/AP-Nut Fitting at 9 O'Clock; Accumulator
2005ChevroletSilverado 3500—8.1LV8GASN/AP-Nut Fitting at 9 O'Clock; Accumulator
2005ChevroletTahoe————N/AP-Nut Fitting at 9 O'Clock; Accumulator
2005GMCSierra 1500Base4.8LV8GASN/AP-Nut Fitting at 9 O'Clock; Accumulator
2005GMCSierra 1500Base5.3LV8FLEXN/AP-Nut Fitting at 9 O'Clock; Accumulator
2005GMCSierra 1500Base5.3LV8GASN/AP-Nut Fitting at 9 O'Clock; Accumulator
2005GMCSierra 1500SLT6.0LV8GASN/AP-Nut Fitting at 9 O'Clock; Accumulator
2005GMCSierra 1500SLT5.3LV8FLEXN/AP-Nut Fitting at 9 O'Clock; Accumulator
2005GMCSierra 1500SLT5.3LV8GASN/AP-Nut Fitting at 9 O'Clock; Accumulator
2005GMCSierra 1500WT4.8LV8GASN/AP-Nut Fitting at 9 O'Clock; Accumulator
2005GMCSierra 1500WT5.3LV8FLEXN/AP-Nut Fitting at 9 O'Clock; Accumulator
2005GMCSierra 1500WT5.3LV8GASN/AP-Nut Fitting at 9 O'Clock; Accumulator
2005GMCSierra 1500SLE6.0LV8GASN/AP-Nut Fitting at 9 O'Clock; Accumulator
2005GMCSierra 1500SLE4.8LV8GASN/AP-Nut Fitting at 9 O'Clock; Accumulator
2005GMCSierra 1500SLE5.3LV8FLEXN/AP-Nut Fitting at 9 O'Clock; Accumulator
2005GMCSierra 1500SLE5.3LV8GASN/AP-Nut Fitting at 9 O'Clock; Accumulator
2005GMCSierra 1500Denali6.0LV8GASN/AP-Nut Fitting at 9 O'Clock; Accumulator
2005GMCSierra 1500 HD————N/AP-Nut Fitting at 9 O'Clock; Accumulator
2005GMCSierra 2500 HD—6.0LV8GASN/AP-Nut Fitting at 9 O'Clock; Accumulator
2005GMCSierra 2500 HD—6.0LV8CNGN/AP-Nut Fitting at 9 O'Clock; Accumulator
2005GMCSierra 2500 HD—8.1LV8GASN/AP-Nut Fitting at 9 O'Clock; Accumulator
2005GMCSierra 3500—6.0LV8GASN/AP-Nut Fitting at 9 O'Clock; Accumulator
2005GMCSierra 3500—6.0LV8CNGN/AP-Nut Fitting at 9 O'Clock; Accumulator
2005GMCSierra 3500—8.1LV8GASN/AP-Nut Fitting at 9 O'Clock; Accumulator
2005GMCYukon————N/AAccumulator
2005GMCYukon XL 1500SLT5.3LV8—N/AAccumulator
2005GMCYukon XL 1500SLE5.3LV8—N/AAccumulator
2005GMCYukon XL 2500————N/AAccumulator
2004ChevroletSilverado 2500 HD—6.0LV8GASN/AP-Nut Fitting at 9 O'Clock; Accumulator
2004ChevroletSilverado 2500 HD—6.0LV8CNGN/AP-Nut Fitting at 9 O'Clock; Accumulator
2004ChevroletSilverado 3500Base6.0LV8GASN/AP-Nut Fitting at 9 O'Clock; Accumulator
2004ChevroletSilverado 3500Base6.0LV8CNGN/AP-Nut Fitting at 9 O'Clock; Accumulator
2004ChevroletSilverado 3500Base8.1LV8GASN/AP-Nut Fitting at 9 O'Clock; Accumulator
2004ChevroletSilverado 3500LS6.0LV8GASN/AP-Nut Fitting at 9 O'Clock; Accumulator
2004ChevroletSilverado 3500LS6.0LV8CNGN/AP-Nut Fitting at 9 O'Clock; Accumulator
2004ChevroletSilverado 3500LS8.1LV8GASN/AP-Nut Fitting at 9 O'Clock; Accumulator
2004ChevroletSilverado 3500LT6.0LV8GASN/AP-Nut Fitting at 9 O'Clock; Accumulator
2004ChevroletSilverado 3500LT6.0LV8CNGN/AP-Nut Fitting at 9 O'Clock; Accumulator
2004ChevroletSilverado 3500LT8.1LV8GASN/AP-Nut Fitting at 9 O'Clock; Accumulator
2004ChevroletSilverado 3500WT6.0LV8GASN/AP-Nut Fitting at 9 O'Clock; Accumulator
2004ChevroletSilverado 3500WT6.0LV8CNGN/AP-Nut Fitting at 9 O'Clock; Accumulator
2004ChevroletSilverado 3500WT8.1LV8GASN/AP-Nut Fitting at 9 O'Clock; Accumulator
2004ChevroletTahoe————N/AP-Nut Fitting at 9 O'Clock; Accumulator
2004GMCSierra 2500————N/AP-Nut Fitting at 9 O'Clock; Accumulator
2004GMCSierra 2500 HD—6.0LV8GASN/AP-Nut Fitting at 9 O'Clock; Accumulator
2004GMCSierra 2500 HD—6.0LV8CNGN/AP-Nut Fitting at 9 O'Clock; Accumulator
2004GMCSierra 2500 HD—8.1LV8GASN/AP-Nut Fitting at 9 O'Clock; Accumulator
2004GMCSierra 3500—6.0LV8GASN/AP-Nut Fitting at 9 O'Clock; Accumulator
2004GMCSierra 3500—6.0LV8CNGN/AP-Nut Fitting at 9 O'Clock; Accumulator
2004GMCSierra 3500—8.1LV8GASN/AP-Nut Fitting at 9 O'Clock; Accumulator
2004GMCYukon————N/AAccumulator
2004GMCYukon XL 1500SLT5.3LV8—N/AAccumulator
2004GMCYukon XL 1500SLE5.3LV8—N/AAccumulator
2004GMCYukon XL 2500————N/AAccumulator
2003ChevroletSilverado 2500 HDBase6.0LV8GASN/AP-Nut Fitting at 9 O'Clock; Accumulator
2003ChevroletSilverado 2500 HDBase6.0LV8CNGN/AP-Nut Fitting at 9 O'Clock; Accumulator
2003ChevroletSilverado 2500 HDLS6.0LV8GASN/AP-Nut Fitting at 9 O'Clock; Accumulator
2003ChevroletSilverado 2500 HDLS6.0LV8CNGN/AP-Nut Fitting at 9 O'Clock; Accumulator
2003ChevroletSilverado 2500 HDLT6.0LV8GASN/AP-Nut Fitting at 9 O'Clock; Accumulator
2003ChevroletSilverado 3500Base6.0LV8GASN/AP-Nut Fitting at 9 O'Clock; Accumulator
2003ChevroletSilverado 3500Base8.1LV8GASN/AP-Nut Fitting at 9 O'Clock; Accumulator
2003ChevroletSilverado 3500Base6.0LV8CNGN/AP-Nut Fitting at 9 O'Clock; Accumulator
2003ChevroletSilverado 3500LS6.0LV8GASN/AP-Nut Fitting at 9 O'Clock; Accumulator
2003ChevroletSilverado 3500LS8.1LV8GASN/AP-Nut Fitting at 9 O'Clock; Accumulator
2003ChevroletSilverado 3500LS6.0LV8CNGN/AP-Nut Fitting at 9 O'Clock; Accumulator
2003ChevroletSilverado 3500LT6.0LV8GASN/AP-Nut Fitting at 9 O'Clock; Accumulator
2003ChevroletSilverado 3500LT8.1LV8GASN/AP-Nut Fitting at 9 O'Clock; Accumulator
2003ChevroletSilverado 3500LT6.0LV8CNGN/AP-Nut Fitting at 9 O'Clock; Accumulator
2003ChevroletTahoe————N/AP-Nut Fitting at 9 O'Clock; Accumulator
2003GMCSierra 1500 HD————N/AP-Nut Fitting at 9 O'Clock; Accumulator
2003GMCSierra 2500————N/AP-Nut Fitting at 9 O'Clock; Accumulator
2003GMCSierra 2500 HD—6.0LV8GASN/AP-Nut Fitting at 9 O'Clock; Accumulator
2003GMCSierra 2500 HD—6.0LV8CNGN/AP-Nut Fitting at 9 O'Clock; Accumulator
2003GMCSierra 2500 HD—8.1LV8GASN/AP-Nut Fitting at 9 O'Clock; Accumulator
2003GMCSierra 3500—6.0LV8GASN/AP-Nut Fitting at 9 O'Clock; Accumulator
2003GMCSierra 3500—8.1LV8GASN/AP-Nut Fitting at 9 O'Clock; Accumulator
2003GMCSierra 3500—6.0LV8CNGN/AP-Nut Fitting at 9 O'Clock; Accumulator
2003GMCYukon————N/AAccumulator
2003GMCYukon XL 1500SLT5.3LV8—N/AAccumulator
2003GMCYukon XL 1500SLE5.3LV8—N/AAccumulator
2003GMCYukon XL 2500————N/AAccumulator
2002ChevroletSilverado 2500 HD—6.0LV8GASN/AP-Nut Fitting at 9 O'Clock; Accumulator
2002ChevroletSilverado 2500 HD—6.0LV8CNGN/AP-Nut Fitting at 9 O'Clock; Accumulator
2002ChevroletSilverado 2500 HD—6.0LV8BI-FUELN/AP-Nut Fitting at 9 O'Clock; Accumulator
2002GMCSierra 1500Base4.3LV6GASN/AExcept Switch Port; P-Nut Fitting at 9 O'Clock; Accumulator
2002GMCSierra 1500SL4.3LV6GASN/AExcept Switch Port; P-Nut Fitting at 9 O'Clock; Accumulator
2002GMCSierra 1500SLT4.3LV6GASN/AExcept Switch Port; P-Nut Fitting at 9 O'Clock; Accumulator
2002GMCSierra 1500WT4.3LV6GASN/AExcept Switch Port; P-Nut Fitting at 9 O'Clock; Accumulator
2002GMCSierra 1500SLE4.3LV6GASN/AExcept Switch Port; P-Nut Fitting at 9 O'Clock; Accumulator
2002GMCSierra 1500HT4.3LV6GASN/AExcept Switch Port; P-Nut Fitting at 9 O'Clock; Accumulator
2002GMCSierra 1500Base4.8LV8GASN/AExcept Switch Port; P-Nut Fitting at 9 O'Clock; Accumulator
2002GMCSierra 1500Base5.3LV8FLEXN/AExcept Switch Port; P-Nut Fitting at 9 O'Clock; Accumulator
2002GMCSierra 1500Base5.3LV8GASN/AExcept Switch Port; P-Nut Fitting at 9 O'Clock; Accumulator
2002GMCSierra 1500SL4.8LV8GASN/AExcept Switch Port; P-Nut Fitting at 9 O'Clock; Accumulator
2002GMCSierra 1500SL5.3LV8FLEXN/AExcept Switch Port; P-Nut Fitting at 9 O'Clock; Accumulator
2002GMCSierra 1500SL5.3LV8GASN/AExcept Switch Port; P-Nut Fitting at 9 O'Clock; Accumulator
2002GMCSierra 1500SLT4.8LV8GASN/AExcept Switch Port; P-Nut Fitting at 9 O'Clock; Accumulator
2002GMCSierra 1500SLT5.3LV8FLEXN/AExcept Switch Port; P-Nut Fitting at 9 O'Clock; Accumulator
2002GMCSierra 1500SLT5.3LV8GASN/AExcept Switch Port; P-Nut Fitting at 9 O'Clock; Accumulator
2002GMCSierra 1500WT4.8LV8GASN/AExcept Switch Port; P-Nut Fitting at 9 O'Clock; Accumulator
2002GMCSierra 1500WT5.3LV8FLEXN/AExcept Switch Port; P-Nut Fitting at 9 O'Clock; Accumulator
2002GMCSierra 1500WT5.3LV8GASN/AExcept Switch Port; P-Nut Fitting at 9 O'Clock; Accumulator
2002GMCSierra 1500SLE4.8LV8GASN/AExcept Switch Port; P-Nut Fitting at 9 O'Clock; Accumulator
2002GMCSierra 1500SLE5.3LV8FLEXN/AExcept Switch Port; P-Nut Fitting at 9 O'Clock; Accumulator
2002GMCSierra 1500SLE5.3LV8GASN/AExcept Switch Port; P-Nut Fitting at 9 O'Clock; Accumulator
2002GMCSierra 1500HT4.8LV8GASN/AExcept Switch Port; P-Nut Fitting at 9 O'Clock; Accumulator
2002GMCSierra 1500HT5.3LV8FLEXN/AExcept Switch Port; P-Nut Fitting at 9 O'Clock; Accumulator
2002GMCSierra 1500HT5.3LV8GASN/AExcept Switch Port; P-Nut Fitting at 9 O'Clock; Accumulator
2002GMCSierra 1500Denali6.0LV8GASN/AExcept Switch Port; P-Nut Fitting at 9 O'Clock; Accumulator
2002GMCSierra 1500 HD————N/AP-Nut Fitting at 9 O'Clock; Accumulator
2002GMCYukonSLT4.8LV8—N/AAccumulator
2002GMCYukonSLT5.3LV8—N/AAccumulator
2002GMCYukonSLE4.8LV8—N/AAccumulator
2002GMCYukonSLE5.3LV8—N/AAccumulator
2002GMCYukon XL 1500SLT5.3LV8—N/AAccumulator
2002GMCYukon XL 1500SLE5.3LV8—N/AAccumulator
2002GMCYukon XL 2500————N/AAccumulator
2001ChevroletSilverado 1500—4.3LV6—N/AP-Nut Fitting at 9 O'Clock; Accumulator
2001ChevroletSilverado 2500 HD—6.6LV8DIESELN/AP-Nut Fitting at 9 O'Clock; Accumulator
2001GMCSierra 1500SL4.3LV6—N/AP-Nut Fitting at 7 O'Clock; P-Nut Fitting at 9 O'Clock; Accumulator
2001GMCSierra 1500SLT4.3LV6—N/AP-Nut Fitting at 7 O'Clock; P-Nut Fitting at 9 O'Clock; Accumulator
2001GMCSierra 1500SLE4.3LV6—N/AP-Nut Fitting at 7 O'Clock; P-Nut Fitting at 9 O'Clock; Accumulator
2001GMCSierra 1500SL4.8LV8—N/AP-Nut Fitting at 7 O'Clock; P-Nut Fitting at 9 O'Clock; Accumulator
2001GMCSierra 1500SL5.3LV8—N/AP-Nut Fitting at 7 O'Clock; P-Nut Fitting at 9 O'Clock; Accumulator
2001GMCSierra 1500SLT4.8LV8—N/AP-Nut Fitting at 7 O'Clock; P-Nut Fitting at 9 O'Clock; Accumulator
2001GMCSierra 1500SLT5.3LV8—N/AP-Nut Fitting at 7 O'Clock; P-Nut Fitting at 9 O'Clock; Accumulator
2001GMCSierra 1500SLE4.8LV8—N/AP-Nut Fitting at 7 O'Clock; P-Nut Fitting at 9 O'Clock; Accumulator
2001GMCSierra 1500SLE5.3LV8—N/AP-Nut Fitting at 7 O'Clock; P-Nut Fitting at 9 O'Clock; Accumulator
2001GMCSierra 1500 HD————N/AP-Nut Fitting at 9 O'Clock; Accumulator
2001GMCSierra 2500————N/AP-Nut Fitting at 7 O'Clock; Accumulator
2001GMCYukonSLT4.8LV8—N/AAccumulator
2001GMCYukonSLT5.3LV8—N/AAccumulator
2001GMCYukonSLE4.8LV8—N/AAccumulator
2001GMCYukonSLE5.3LV8—N/AAccumulator
2001GMCYukon XL 1500SLT5.3LV8—N/AAccumulator
2001GMCYukon XL 1500SLE5.3LV8—N/AAccumulator
2001GMCYukon XL 2500————N/AAccumulator
2000ChevroletSilverado 1500—4.3LV6—N/AP-Nut Fitting at 9 O'Clock; Accumulator
2000GMCSierra 1500—4.3LV6—N/AP-Nut Fitting at 7 O'Clock; P-Nut Fitting at 9 O'Clock; Accumulator
2000GMCSierra 1500—4.8LV8—N/AP-Nut Fitting at 7 O'Clock; P-Nut Fitting at 9 O'Clock; Accumulator
2000GMCSierra 1500—5.3LV8—N/AP-Nut Fitting at 7 O'Clock; P-Nut Fitting at 9 O'Clock; Accumulator
2000GMCSierra 2500————N/AP-Nut Fitting at 7 O'Clock; Accumulator
2000GMCYukon XL 2500————N/AAccumulator
1999ChevroletSilverado 1500—4.3LV6—N/AP-Nut Fitting at 9 O'Clock; Accumulator
1999GMCSierra 1500—4.3LV6—N/AP-Nut Fitting at 7 O'Clock; P-Nut Fitting at 9 O'Clock; Accumulator
1999GMCSierra 1500—4.8LV8—N/AP-Nut Fitting at 7 O'Clock; P-Nut Fitting at 9 O'Clock; Accumulator
1999GMCSierra 1500—5.3LV8—N/AP-Nut Fitting at 7 O'Clock; P-Nut Fitting at 9 O'Clock; Accumulator
1999GMCSierra 2500————N/AP-Nut Fitting at 7 O'Clock; Accumulator