What it is: Aftermarket multi-purpose control relay (12V, 30A, 4-pin, green fuse on top) designed to replace OE 0015429619 (A0015429619). Cross-ref: VEMO V30-71-0038 / V30710038.
What it does: Depending on vehicle configuration, this relay either drives the auxiliary engine cooling fan (Stage 2/high speed) or supplies power to the fuel pump. Replacing a failing relay can restore proper high-speed fan engagement to prevent overheating, or recover fuel-pump power to address no-start/hard-start and stalling.
Key specs: 12V system; 30A protection; 4-pin footprint; green housing with integrated fuse.
Install location: Engine-bay fuse/relay box (location varies by model; verify by VIN or service manual).
Typical symptoms resolved: No high-speed aux-fan operation (overheating at idle/A/C on); no-start/hard start; intermittent stall from fuel-pump power loss.
Compatibility summary: Fits selected Mercedes-Benz models including R129 SL (1994–2002 SL500; 1994–2002 SL600; 1994–1997 SL320), W202 C-Class (1994–1996 C220; 1997–1998 C230; 1994–1997 C280; 1995–1997 C36 AMG), and W124/W201 models listed above. Always confirm by OE number and VIN.
Complementary parts: Stage-1 aux-fan relay A0025420119; fuel pump A0004707894 (if pump performance is the root cause).
Note: This is an aftermarket replacement part. All brand and model names are used strictly for compatibility reference only.