ajh Posted March 1, 2011 Share Posted March 1, 2011 Has anyone just put a variable resistor on the main power lead for the heater box fan to bypass the rest of the electronics and have dial-adjustability for fan speed? I'm looking for a resistance range/suggestion on which to use. If there's any sane reason for the setup LR uses I'd love to hear about it. Quote Link to comment Share on other sites More sharing options...
western Posted March 1, 2011 Share Posted March 1, 2011 the slide also controls the air flap in the heater box, there is a resistor that replaces the LR one, it gives a better speed on the first click & the full speed remains. contact simonb on here for more details. Quote Link to comment Share on other sites More sharing options...
ajh Posted March 1, 2011 Author Share Posted March 1, 2011 I'm aware of this but there's no reason those controls couldn't be separated. The fan is just a 12V DC fan so being able to use a varistor or 10-position dial resistor of suitable capacity just seems like a good idea. I'm also going to install booster fans for getting heat to the rear of the vehicle as well. I had things freezing up in the back going through Wyoming at 9,000ft with a dead fan (got some heat but all from air-pressure while moving). A booster fan would also ensure getting heat even if the main fan dies again and on low speed would reduce the amount of work the main fan needs to do as well. I'm doing my dash from scratch from the bulkhead out so I have a lot of re-engineering opportunities to consider. Quote Link to comment Share on other sites More sharing options...
Retroanaconda Posted March 1, 2011 Share Posted March 1, 2011 A better way of controlling the speed of a DC motor is a PWM circuit. You can buy pre-made PWM controllers that are rated up to 15A, or they're pretty easy to knock up if you can do soldering etc. Quote Link to comment Share on other sites More sharing options...
ajh Posted March 1, 2011 Author Share Posted March 1, 2011 Thanks, that's the information I needed Should be able to get things feeling almost modern by the time I'm finished. Quote Link to comment Share on other sites More sharing options...
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