Commer Light vans, PB

Coolant capacity & service interval

The Commer Light vans, PB coolant capacity ranges from 6 to 7 liters. Four configurations are covered in the data.

The configuration chart below lists fill volumes and service intervals for each engine and trim variant.

TypeSpecifications
1500, PBC (1967-1974)
  • Use: Normal
  • Capacity 7 liter
1500 Diesel, PBR (1967-1974)
  • Use: Normal
  • Capacity 6 liter
2500, PBC (1967-1974)
  • Use: Normal
  • Capacity 7 liter
2500 Diesel, PBR (1967-1974)
  • Use: Normal
  • Capacity 6 liter

Additional Notes

  • The Commer Light Vans PB cooling system capacities split along body or engine configuration lines, with PBR variants holding 6 liters and PBC variants holding 7 liters.
  • The 1-liter difference between PBR and PBC configurations is a meaningful distinction at service time, as underfilling a cooling system can lead to inadequate heat dissipation and potential overheating.
  • Both the 1500 Diesel and 2500 Diesel in PBR configuration share an identical 6-liter cooling system capacity across the 1967-1974 span, meaning the displacement increase between those two diesel variants did not alter the coolant volume requirement.
  • The 1500 PBC and 2500 PBC variants likewise share a common 7-liter capacity, again showing that the step up in engine size within the PBC body type carried no change in cooling system fill volume.
  • All four configurations carry a normal use condition designation, which in cooling system service contexts typically refers to standard operating environments without the added thermal stress associated with severe-duty cycles such as sustained heavy loads or extreme ambient temperatures.
  • A 6-liter cooling system, as seen on the PBR diesel variants, is a moderately sized capacity for a light commercial van of this era, consistent with the relatively compact engine bays and auxiliary heating demands of vehicles in the late 1960s and early 1970s.
  • The 7-liter figure on the PBC variants represents a roughly 17 percent greater coolant volume compared to the PBR specification, a gap that would be reflected in both the quantity of antifreeze concentrate required and the total flush volume during a full coolant change.

Other Systems