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3rd Gen Ram Tech2002-2008 Rams: This section is for TECHNICAL discussions only, that involve the 2002 through 2008 Rams Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
I got a 2nd gen so i usually over there. But, I got a friend that has a 2003 ram 1500 and he said the fan only works sometimes and if it does only on high. I don't have all the details now but i just wanted to see if it was a known problem or something. I don't know if it happens when the heat is on but i know it does when the AC is on. Any ideas?
If high comes and goes, then I would suspect the blower, ignition switch or speed control switch. If it's just the 3 lower speeds coming and going, then the resistor block is where i would start.