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Old 09-05-2018, 09:36 PM   #1
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Dash AC fan wiring scorched on Coachmen Mirada. Twice!

I have a running problem with our 2002 coachmen Mirada, F53 chassis, Tempcon single zone, 3 dial AC system.
The fan speed for the AC gets very slow. It does this in either AC or Max. The air still comes out of the dash vents, just slowly. If I give it a mighty whack on the dashboard top it goes to full speed for a while.

This is not the first time. Last time it happened the red wire on the back of the fan speed control burned off leaving an inch of scorched wire and the lug melted off of the control back. It suddenly smelled like smoke and it melted. I ordered a new one from a Tempcon parts supplier and it fixed it.

Now it is doing it again. I looked at the control (see picture) and it is scorched again. I hate fire and I have to fix it ASAP. I am in Carson City NV headed to Death Valley and need the air.



A- Where am I going to get one without knowing where I am going to be staying?
B- Can I just expect this switch to cook off every five years or is there another cause? I just had that control out a month ago and there was no sign of a problem.
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Old 09-05-2018, 10:19 PM   #2
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There is a bad/loose connection there. Either the wire was overheated and not cleaned or cut short enough prior to crimping that terminal, or, the crimp is not tight enough, or, the push on terminal is too loose and not making a good conection.

Heat comes from a poor electrical connection.
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Old 09-05-2018, 10:41 PM   #3
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Cut it back and put a new end on it and clean the terminal very good. Make sure its tight when you put it on.
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Old 09-06-2018, 09:45 AM   #4
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If that is all it is I will be grateful indeed. I will do that today. I have plenty of terminals and a crimper with me. I'll report back next time I find WiFI
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Old 09-06-2018, 08:08 PM   #5
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Sounds like the switch itself is not designed for the load on it. I would abandon the switch altogether, get a higher amp switch (heavy duty) and mount on the dash. You may be able to find one that matches other dash switches.
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Old 09-06-2018, 09:18 PM   #6
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Quote:
Originally Posted by trx430ex View Post
Sounds like the switch itself is not designed for the load on it. I would abandon the switch altogether, get a higher amp switch (heavy duty) and mount on the dash. You may be able to find one that matches other dash switches.
i In that case I would consider 2 heavy toggles for low winding and medium using both for high. Might be fun to add a third for both and paint it red.

Actually I did wonder about that. I was thinking too much fan motor for the switch. I figured that if it was so I would hear about it since this is the same setup used in thousands of RV, super duty trucks and even the short buses I used to drive for a living. So far nobody has said anything. If they do I will reopace it or add a relay or two.
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Old 09-06-2018, 09:28 PM   #7
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Deuce/ Hypoxia:
I went to several parts place until I finally found female spade fittings with a rating to handle the potential current in the wire they were made to fit. Too many cheap lugs designed to fit 10 gs wire can't handle the current and that might be the problem here. These Gardner Bender ones can take 25amps. I stripped the wire back to clean copper then did the same to the other one that was showing signs of overheating. I sanded down the lugs on the switch, checked everything in sight, plugged them in and Bada Bing! I was back in business. I forgot how much the AC used to blow. Now I will wait and see what happens in the long run but it is working great! Thanks
PS Love your moniker Hypoxia. specially as I am at 8,000 feet getting ready to hike up a mountain.
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