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Old 07-05-2022, 05:01 PM   #1
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DUH, Roof A/C.

We experienced the front roof air conditioner not working this weekend after several 92-94 degree days with high humidity. I have heard a bit about A/C's "freezing up" and it seemed to fit my symptoms, not cold, not blowing much air, etc. After shutting it down for a couple hours it would work fine, until it happens again, over and over. I've seen posts about the freeze sensor possibly coming loose from the coils and thought I would check it out, and this is what I found
This is on the original unit on our coach with a build date of 1998 !! LOL, these things never cease to amaze me.

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Old 07-05-2022, 05:20 PM   #2
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So I guess your saying the sensor was never installed?

Am surprised it’s a thermistor of sorts - would have thought a ‘98wold be a sealed capillary tube.
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Old 07-05-2022, 05:25 PM   #3
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yep, that will do it!
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Old 07-05-2022, 05:44 PM   #4
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The evaporator coil in that picture is very dirty and would restrict air flow. Needs to be cleaned before you do anything. Yes, the freeze sensor (thermistor) is in the wrong place, but I doubt that's your issue. Going to be messy job to clean. Fan blade is most likely dirty also. Use a foaming coil cleaner or Simple Green to clean. Needs to be safe for aluminum.
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Old 07-05-2022, 07:36 PM   #5
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The evaporator coil in that picture is very dirty and would restrict air flow. Needs to be cleaned before you do anything. Yes, the freeze sensor (thermistor) is in the wrong place, but I doubt that's your issue. Going to be messy job to clean. Fan blade is most likely dirty also. Use a foaming coil cleaner or Simple Green to clean. Needs to be safe for aluminum.
While I whole heartedly agree with you in spirit. No where do I show my evaporator coil in my pictures, lol. Mine is spotless. What you see in the pictures is the insulation on the back-side of the enclosure. But, Yes ! if my coil was as dirty and plugged as that picture of the insulation, then it would definitely need attention.
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Old 07-05-2022, 08:07 PM   #6
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Lets hope installing in evap. coil fixes your problem. Frost up will occur more often as charge diminishes just enough with age.
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Old 07-05-2022, 11:34 PM   #7
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WELL, that explains the FREEZESTAT NOT WORKING ISSUE?
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Old 07-06-2022, 03:28 AM   #8
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Lets hope installing in evap. coil fixes your problem. Frost up will occur more often as charge diminishes just enough with age.
Yeah, I hope so. I ran it for 4 hours last night after I fixed it but no where near the heat as when I was having the problem. We'll see...
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Old 07-06-2022, 01:28 PM   #9
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WELL, that explains the FREEZESTAT NOT WORKING ISSUE?
It may still work, but he's gonna need a lot more ice buildup to find out.
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Old 07-06-2022, 03:36 PM   #10
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Lets hope installing in evap. coil fixes your problem. Frost up will occur more often as charge diminishes just enough with age.
Frost buildup due to low charge is very, very, limited.

Frost buildup due to restricted or inadequate air flow is more likely.

Its a heat balance equation -

If the air flow is right, and its low on charge, there is enough heat in the air to minimize frosting, if it frosts at all, and even then it will be limited to right at the TXV or cap tubes.

If the air flow is compromised, the refrigeration system keeps on trying to remove the heat that isnt there, so it just gets colder and colder until the coil is at 32 degrees.
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Old 07-06-2022, 03:46 PM   #11
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Another issue is to not let the A/C u int run on LOW fan speed. Set it to run at HIGH speed. LOW speed is more prone to freezing.

Ken
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Old 07-18-2022, 05:00 AM   #12
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Well, I can now confirm after 5 days of HOT camping, installing the freeze sensor in the evaporator as it was supposed to, has completely fixed the problem. Still baffles me how it went 20 plus years of not being noticed.
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Old 07-19-2022, 11:52 AM   #13
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When coils at work start to freeze ,usually low on freon but many MH owners found ducts collapsed and poorly cut with blockages ect.
Matter of fact I think I have issue out into my front AC outlet duct extending to far into branch tee.
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Well, I can now confirm after 5 days of HOT camping, installing the freeze sensor in the evaporator as it was supposed to, has completely fixed the problem. Still baffles me how it went 20 plus years of not being noticed.
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Old 07-31-2022, 09:47 PM   #14
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Another issue is to not let the A/C u int run on LOW fan speed. Set it to run at HIGH speed. LOW speed is more prone to freezing.

Ken
It wouldn't if the T stat is backed down from max.

I'd also take the the time to clean the unit with coil cleaner prior to buttoning up.
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