Hello.
Car is 92 500SEL and it's missing door closing assist pump. I connected my friends pump from 95 S500 he has for parts. On his pump 2 pins are blank on pump socket but my plug has wire for missing pin. Pump closed doors but with some problems. It would start working after doors are closed and heat up a lot then will not close doors. Since I never had original pump and it must be a reason why it's not in car (broke?) so question is is 95 S500 pump intrerchangable with 92 500SEL pump? I need to know if they are so I can start troubleshooting whole system.
Thanks

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1999 ML430 Silver 135k ml
Smoked LED taillights, Alpine in-dash DVD player, 12" sub, Pioneer components, 2 amps, 4200k HIDs, ML55 headlights, 20" rims, mirror LED blinkers

SOLD. 1996 E320 145k ml. Burgundy

SOLD but miss it everyday 1992 500sel Black
Chime buzzer mod,Alpine CD/MP3 player with stock amp,Euro headlights,S600 grill,20" rims, BEST CAR EVER!

SOLD. 1990 300E White
187k ml,smoked tails,Euro headlights,17rims,Intake,12" sub in first aid kit,alarm/autostart,buzzer mod