Overview. The W116 300SD was fitted with the Delco R4 A/C compressor, which has reliability problems. This bolt-on kit converts your 300SD to a modern Sanden SD7H15 compressor with no cutting, welding, or permanent changes to the vehicle. Starting in 2010, we were the first company to offer a Sanden upgrade kit for the W116 300SD.
Features
- Precision steel brackets with yellow zinc finish, made in the USA
- Goodyear Galaxy or Parker Futura full-barrier hose
- O-ring fittings at the compressor; original flare fittings at the evaporator and condenser (o-ring versions on request)
- R-134a charge ports
Fitment
- 1978–80 W116 300SD with a Delco R4 (R4 photo)
- Uses a Sanden SD7H15 Model 4709 (preferred) or 4272; the two are interchangeable
What’s included
- Mounting brackets and DIN/ISO hardened hardware
- High-pressure hose (compressor to condenser) and low-pressure hose (compressor to evaporator), with uncrimped fittings
- Complete HNBR o-ring set
- Delco male connector and terminals, plus a new v-belt
- Illustrated PDF instructions
- Optional: Sanden SD7H15 (Model 4709 or 4272)
Installation
The two original hoses at the compressor are replaced; the liquid line (drier to TXV) is reused. Hose fittings must be crimped with the proper tool. We include the hose and fittings for you. Flush the system thoroughly and replace the drier, TXV and pressure switch for best results.
Good to know
- Contact us for a consultation before purchase
- Warranty: brackets lifetime; all other parts 1 year
- Lead time: up to 15 days (built to order); please plan ahead
- Instructions: PDF download in your order receipt
- For off-road use only; not approved by Mercedes-Benz
- Download: Sanden SD Compressor Service Guide (PDF)
