Fixed my AC and found a trick for colder AC! - LotusTalk - The Lotus Cars Community
 
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post #1 of 13 (permalink) Old 06-18-2015, 04:56 PM Thread Starter
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Fixed my AC and found a trick for colder AC!

So I was able to find that my AC was not blowing cold because the radiator blower fans were not coming on at all for it. Wired up a bypass switch to manually turn the fans on and it worked!

On that note from an engineering side, I figured out a trick to getting a little bit more cooling out of the system: since more heat dissipated from the condenser equates to more cooling, having the radiator fans on high cools them off more. I got the temp down quite a few more degrees by wiring them to come on full power. (unfortunately I forgot which wires I did now so if anyone knows offhand which color wires were fans on high please post up
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post #2 of 13 (permalink) Old 06-18-2015, 09:44 PM
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I thought all cars were wired so the cooling fans went on high when the ac was turned on. Am I wrong?

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post #3 of 13 (permalink) Old 06-18-2015, 10:38 PM
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The cooling fans are switched as a pair, and will operate at half speed (connected in series) when coolant temperature reaches 98C on rise, and switch off at 94C on fall.
The fans will also operate at half speed irrespective of coolant temperature if the a.c. is switched on and the compressor is running.
If coolant temperature rises to 103C, the fans will switch to full speed (connected in parallel), reverting to half speed at 98C.
The fans will also run at half speed, unless high coolant temperature dictates otherwise, when the a.c. is switched on and the compressor is running, or if the engine management system detects a fault with the inlet air temperature or coolant temperature circuits.

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post #4 of 13 (permalink) Old 06-19-2015, 04:58 PM Thread Starter
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hey gunpilot you wouldnt happen to know which wires to jump for both full speed would you?
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post #5 of 13 (permalink) Old 07-02-2015, 01:43 AM
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there's also an automate way to do that, jump together pin 63 and 67 on relay unit. this will make fan go always faster
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post #6 of 13 (permalink) Old 07-03-2015, 06:18 AM Thread Starter
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You know which wires those are?
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post #7 of 13 (permalink) Old 07-03-2015, 08:35 AM
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Here is a question.

I know the fans go on half speed when you turn AC on. Do they stay on even when you turn AC off until you turn car off?

I somehow got the impression that was the case and was a decent way to keep airflow on radiator when cruising at low speeds.

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post #8 of 13 (permalink) Old 07-03-2015, 09:13 AM
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Wiring in series gives you quarter power, not half.
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post #9 of 13 (permalink) Old 07-08-2015, 07:17 PM
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How often does the cold air not work?
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post #10 of 13 (permalink) Old 07-10-2015, 07:33 AM
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@Motard - On my Elise they do. I just noticed it recently, I don't use the AC very often. I was wondering if this is normal. Will have to check the service manual when I get around to it.

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post #11 of 13 (permalink) Old 08-20-2015, 07:39 AM
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Bear in mind that you'll also reduce the lifetime of your fans if they always run full speed.
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post #12 of 13 (permalink) Old 08-20-2015, 12:08 PM
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Quote:
Originally Posted by otoman View Post
Bear in mind that you'll also reduce the lifetime of your fans if they always run full speed.
I have an '89 Toyota on original fans that still works great daily. I'm guessing the lifetime of those motors is longer than necessary on a Lotus.
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post #13 of 13 (permalink) Old 09-03-2015, 12:48 AM
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Over cooling your engine could be an issue.
And noise was probably a consideration.
You really only want to max out the airflow when called for.
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