Help please! My car (1990 300E 12V) has been having overheating issues and I think the culprit is a sticking aux fan...that problem has been temporarily solved by blasting the heat a bit to bring temp down.. but today, as I was at the lights waiting to turn left, heat on, I noticed that the signal lights weren't ticking, then my abs light came on a bit and radio shut off....as soon as I turned the heat off, everything was fine....does anyone know what the prob is???

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