A/C fan knob very hot - LotusTalk - The Lotus Cars Community
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post #1 of 26 (permalink) Old 08-12-2015, 06:38 PM Thread Starter
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A/C fan knob very hot

I've forgotten to post about this many times, but here it is. As the title indicates my blower fan's control knob gets very hot to the the touch after running the fan for awhile. It's hot enough to burn your fingers if touching it more than a second or two. It's not just a summer heat issue either; happens in winter too with the heater on. So is this a thing or is it unique to my car? Other than the heat there is no other issue, but I'm afraid that it could damage some of the solid state components.

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post #2 of 26 (permalink) Old 08-12-2015, 07:34 PM
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That doesn't seem right. I've never even noticed mine warm at all on my 2011 or 2012. Must be some short or something. Does your battery bleed down?

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post #3 of 26 (permalink) Old 08-12-2015, 10:37 PM
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Definitely not . Puzzling.

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post #4 of 26 (permalink) Old 08-12-2015, 10:43 PM
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Mine gets hot too, it's been this way for months. Everything works fine though..
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post #5 of 26 (permalink) Old 08-12-2015, 10:51 PM
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It's heated like the seats.

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post #6 of 26 (permalink) Old 08-13-2015, 12:59 AM
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Could be a loose connector under the panel. My selector knob did not work. It was de connector that had come loose. Removing the panel is an easy job, beware of the metal clips.

Here some help
https://www.lotustalk.com/forums/f170...t-boot-152690/

Good luck

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post #7 of 26 (permalink) Old 08-13-2015, 02:56 AM
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Those metal knobs heat soak everything. Thank goodness no metal shifter like Elise. That would fry the hands after a hot day!

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post #8 of 26 (permalink) Old 08-13-2015, 05:44 PM
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Mine does get a little warm, not hot but warm.

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post #9 of 26 (permalink) Old 08-13-2015, 08:16 PM
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Mine gets hot
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post #10 of 26 (permalink) Old 08-14-2015, 06:23 AM
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I have never noticed that. Maybe too much voltage running to that switch?

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post #11 of 26 (permalink) Old 08-14-2015, 07:00 AM
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I'm guessing you mean the one that controls fan speed, right? That one is connected directly to a potentiometer aka variable resistor aka heater. If you have a lot of current through there then it'll definitely heat up. Does the fan speed actually change through the four positions? If not, then your resistor pack may be on the fritz.

I'm looking at the schematic, and it looks like Lotus is sending all of the fan power through that knob! Have you noticed if it heats up regardless of fan speed or just at higher speeds when more current is passing through?


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post #12 of 26 (permalink) Old 08-14-2015, 07:01 AM
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I have the fan on all the time and have never noticed it being warm to the touch much less hot.

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post #13 of 26 (permalink) Old 08-15-2015, 01:54 AM Thread Starter
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Quote:
Originally Posted by cyow5 View Post
I'm guessing you mean the one that controls fan speed, right? That one is connected directly to a potentiometer aka variable resistor aka heater. If you have a lot of current through there then it'll definitely heat up. Does the fan speed actually change through the four positions? If not, then your resistor pack may be on the fritz.

I'm looking at the schematic, and it looks like Lotus is sending all of the fan power through that knob! Have you noticed if it heats up regardless of fan speed or just at higher speeds when more current is passing through?


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Yes, the speed changes in all positions, & it the heat increases at higher fan speeds. Thanks for the confirmation regarding all the power going through the knob; I had suspected that may have been the case. As long as the knob is designed to carry that much load & heat I won't be too concerned with it.

Whenever the knob gets real hot I just turn the fan off for a few minutes & let it cool down. Having said that, it gets kind of difficult in 100+ degree temps though lol.

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post #14 of 26 (permalink) Old 08-15-2015, 02:38 AM
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Yes, the speed changes in all positions, & it the heat increases at higher fan speeds. Thanks for the confirmation regarding all the power going through the knob; I had suspected that may have been the case. As long as the knob is designed to carry that much load & heat I won't be too concerned with it.



Whenever the knob gets real hot I just turn the fan off for a few minutes & let it cool down. Having said that, it gets kind of difficult in 100+ degree temps though lol.

Yeah, I was really surprised to see a 20A fuse inline to a potentiometer. Maybe that's normal, but it is way higher than I'd expect.

I had forgotten, too - mine caught fire once. It was raining heavily and I had to rip that console out and blow it out. It looked like maybe some dust had lit off or the wire insulation itself caught fire. I had assumed that the water shorted the resistor pack momentarily and caused a power increase.


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post #15 of 26 (permalink) Old 08-15-2015, 07:54 AM Thread Starter
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Yeah, I was really surprised to see a 20A fuse inline to a potentiometer. Maybe that's normal, but it is way higher than I'd expect.

I had forgotten, too - mine caught fire once. It was raining heavily and I had to rip that console out and blow it out. It looked like maybe some dust had lit off or the wire insulation itself caught fire. I had assumed that the water shorted the resistor pack momentarily and caused a power increase.


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Oh snap!

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post #16 of 26 (permalink) Old 10-01-2015, 12:27 PM
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Mine also gets hot.
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post #17 of 26 (permalink) Old 10-01-2015, 03:15 PM Thread Starter
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Upon re-reading my original post I should've mentioned this happens predominantly on long road trips. Therefore I doubt many Evora owners would ever notice it during occasional Sunday drives.

2013 Evora 6spd 2+0
1991 Lotus Elan Turbo

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post #18 of 26 (permalink) Old 10-01-2015, 03:44 PM
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after 5 hour trips with full AC in 95-100 degree temps I've never noticed it on either my 2010 or 2011.

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post #19 of 26 (permalink) Old 10-01-2015, 04:34 PM
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Agreed. After a 5+ hour trip on Tues, incl 2 hrs in that parking lot known as I-95, my AC knob was fine.

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post #20 of 26 (permalink) Old 10-02-2015, 12:37 AM
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Same here. I have never noticed the knob get hot even after several hours in extreme outside temps.


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