Sanden Compressor Conversions for M20-Powered BMW E30s M20-powered E30s were originally fitted with one of three air-conditioning compressors: Bosch, Seiko (largely identical to Bosch), or Denso. This guide specifically focuses on converting E30 M20 cars that were originally equipped with Denso 10P15E compressors to a Sanden compressor. The reason for this focus is the commonality in SAE fitting sizes, which makes the conversion significantly more straightforward compared to Bosch or Seiko-equipped cars. The factory E30 A/C system uses SAE-sized fittings: Denso compressors use #10 (suction) and #8 (discharge) Bosch/Seiko compressors use #12 (suction) and #8 (discharge) Because Sanden compressors are readily available with #10 and #8 SAE ports, Denso-equipped cars require fewer adaptations and allow the original hoses and system layout to be retained with minimal modification. While Bosch/Seiko cars can also be converted, they typically require additional hose changes or custom fittings and are outside the primary scope of this guide. Sanden compressors are available in many configurations, offering different suction and discharge sizes as well as multiple port orientations. This flexibility makes them attractive replacements—but also adds complexity. ——————————————————————————————————————————————————————- Refrigerant Choices: USA vs. Rest of the World Online discussions around refrigerants often split into two camps: the United … Continue reading Sanden Compressor conversion into an E30 (M20) originally fitted with Denso 10P15E