There are lots of variations of the so-called “508″ style Sanden AC compressor. Most all have 8 mounting tabs that are compatible with our Kwik bracket kits.
At the top of the list would the following models:
4665 and 4645
These are later versions which are made for R134 refrigerant. They both have 7-groove pulleys and they work fine even though your GM belt is only a 6-groove.
Here’s what different about the two models:
The 4645 has the following features not found on the 4665:
1. High pressure relief valve on the back plate.
2. Rubber dampers on the clutch armature plate. Slightly quieter operation.
3. 300 cc oil capacity instead of the 240 cc in the 4665.
Most people will find these are minor differences and we recommend which ever one you can find the best deal on.
If your parts counter person doesn’t recognize the four-digit model numbers, have them search for the following applications:
4645:
Same as:
Freightliner truck ABP N83 304953
Peterbilt or Kenworth truck 4645SAN
Volvo truck 85100864
CarQuest 274073
4665:
Same as:
Volvo truck 85100887
CarQuest 275088
