Compressor works, fan works, but fan does not come on with compressor.

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Old 03-17-18, 07:03 AM
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Compressor works, fan works, but fan does not come on with compressor.

Hi, I have an ancient 1974 SilverStreak with a Coleman overhead AC unit. The unit had no fan motor in it when I bought it. I tested the compressor and it worked, so I finally figured out an aftermarket motor and capacitor to work. I just had to get creative with mounting. So I just hooked it all up and the fan works great, hi/low speed. (Black wire to high fan, red wire to low fan, brown wire to capacitor, and white wire to power on the contactor, with a jumper from white to capacitor.) My problem is the unit has "Fan only" which works fine, and "cooling" which will turn on the compressor, but the fan does not come on. I'm certain it is the wiring or possibly the contactor? It is a single capacitor system, so there is a capacitor for the compressor and a cap for the fan motor. Most of the compressor wiring was still hooked up, but I have no idea if some jumper or something is missing. I'm so close to having this thing working, any help would be much appreciated.
 
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Old 03-17-18, 07:22 AM
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Post some pictures so that we can see the wire connections that you have.
A picture of a wiring diagram would also help if it is available.
 
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Old 03-17-18, 07:33 AM
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Ok, thanks Houston, I will get some photos later today. I appreciate it.
 
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Old 03-17-18, 10:17 AM
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A model number would be helpful too.
Do you have a wall mounted thermostat connected ?

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Old 03-17-18, 12:41 PM
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haha, model number, when I called Coleman the rep. told me my model # did not exist, then he said "wait a minute", Said he had to get an actual book, and that he had not seen one of these in his 6 years. Thanks for your input, but I got it wooped, thanks to some sage mystical advice from Houston!
 
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Old 03-17-18, 12:47 PM
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Hey Neighbor! I'm in Trinity. Wow thanks, your advice led me to an easy fix! I'm super good at puzzles/fixing things, but not so much with electrical. Once I found this mystical "wiring diagram" you spoke of, everything became clear! I had the white wire from motor going to the contactor "line" white, I just had to switch it to the compressor cap and she runs just dandy! Thanks a bunch, I owe you a beer or a cheeseburger. Let me know if you come through Trinity. Woop! I'm a cool as a cucumber!
 
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Old 03-17-18, 01:13 PM
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You were lucky to find a wiring diagram. I have several of them here.
Good job.
 
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Old 03-17-18, 05:13 PM
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Thanks PJ, It was actually still under the cover on the inside of the camper. This was a very fun project, from fabricating a cushioned mount for the aftermarket replacement motor, to the crazy wiring. I've never dealt with capacitors and such, but now have a good handle on how they work, so the next puzzle should be easier to solve.
 
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