For 1990-2000 GMC K3500 - Four Seasons A/C Orifice Tube

1990 GMC K3500 Optional Automatic Adjusting Orifice Tube For Severe Climates Over 105 Degrees;. 1991 GMC K3500 Optional Automatic Adjusting Orifice Tube For Severe Climates Over 105 Degrees;. 1992 GMC K3500 Optional Automatic Adjusting Orifice Tube For Severe Climates Over 105 Degrees;.