i wouldn't consider 4A high current. dc motors used in car seats and doors draw easily 5-6 Amp with no load,
8-12 Amp with light load and stall current can be much higher (25Amp or more).
we build machines for automotove industry and as such we get lots of
samples of power seats, power windows etc. since we get them as surplus, we used to play with them. note that these motors are light duty, they are designed to run for only few seconds. they can be ok but they are far from perfect. one guy was using them to motorize toy car that originally was peddal-powered. it worked great... for about 15-20minutes.
if you want something that will run much longer, look for better quality motor such as windshield wiper. they are much better, designed to work continuously.