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07-05-2022, 05:01 PM
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#1
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Senior Member
Join Date: Oct 2019
Posts: 452
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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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1999 American Dream 40DVS
Spartan Chassis, Cummins ISC 330
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07-05-2022, 05:20 PM
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#2
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Senior Member
Join Date: Aug 2019
Location: Eastern outskirts of Dallas, TX
Posts: 1,850
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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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‘91 Ultrastar Champion‘02 Georgie Boy Landau 8.1l Workhorse
‘03 Jeep Wrangler TJ 2018 Jeep Wrangler JK toad
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07-05-2022, 05:25 PM
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#3
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Senior Member
Join Date: Mar 2012
Location: Florida panhandle
Posts: 1,007
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yep, that will do it!
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2018 Adventurer 19RD 19’ 11”
Ford E350 V10 Cutaway Chassis Class C
#10050 GVWR, #18500 GCWR Smoke that!
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07-05-2022, 05:44 PM
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#4
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Senior Member
Winnebago Owners Club
Join Date: Jan 2017
Location: Las Vegas NV.
Posts: 625
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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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Robert, Sami and our driver Zink the puppy dog, co-driver Jax the puppy dog and the boss Katie.
2017 Winnebago Vista LX 35F. 5 Star Tune, Hellwig sway bars, Super Steer Trac Bar, 1600 Watt Solar, ARP, Spare tire carrier, 2020 Jeep Wrangler, Ready Brute Elite. 
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07-05-2022, 07:36 PM
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#5
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Senior Member
Join Date: Oct 2019
Posts: 452
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Quote:
Originally Posted by fcbbob15
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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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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1999 American Dream 40DVS
Spartan Chassis, Cummins ISC 330
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07-05-2022, 08:07 PM
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#6
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Senior Member
Join Date: Mar 2019
Location: Braidwood Il.
Posts: 5,865
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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.
__________________
95 Monaco Crown Royale
M11 400hp, 4060 trans.
Aquahot, Generac Guardian7.5k
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07-05-2022, 11:34 PM
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#7
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Senior Member
Gulf Streamers Club Ford Super Duty Owner
Join Date: Aug 2015
Location: Memphis, TN
Posts: 3,366
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WELL, that explains the FREEZESTAT NOT WORKING ISSUE?
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(TerryH.) 2000-GS Conquest Limited 6266 Class-C 99-E450SD V10 
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07-06-2022, 03:28 AM
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#8
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Senior Member
Join Date: Oct 2019
Posts: 452
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Quote:
Originally Posted by 153stars
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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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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1999 American Dream 40DVS
Spartan Chassis, Cummins ISC 330
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07-06-2022, 01:28 PM
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#9
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Senior Member
Join Date: Aug 2001
Location: North America somewhere
Posts: 26,029
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Quote:
Originally Posted by THenne1713
WELL, that explains the FREEZESTAT NOT WORKING ISSUE?
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It may still work, but he's gonna need a lot more ice buildup to find out. 
__________________
2000 Winnebago Ultimate Freedom USQ40JD , ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA. " My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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07-06-2022, 03:36 PM
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#10
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Senior Member
Join Date: Aug 2019
Location: Eastern outskirts of Dallas, TX
Posts: 1,850
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Quote:
Originally Posted by 153stars
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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Frost buildup due to low charge is very, very, limited.
Frost buildup due to restricted or inadequate air flow is more likely.
It’s a heat balance equation -
If the air flow is right, and it’s 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 isn’t there, so it just gets colder and colder until the coil is at 32 degrees.
__________________
‘91 Ultrastar Champion‘02 Georgie Boy Landau 8.1l Workhorse
‘03 Jeep Wrangler TJ 2018 Jeep Wrangler JK toad
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07-06-2022, 03:46 PM
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#11
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Moderator Emeritus
Ford Super Duty Owner
Join Date: Aug 2000
Location: Full Time, TX Home Base
Posts: 21,906
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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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Amateur Radio Operator (KE5DFR)|Full-Time! - 2012 6.7L Ford Crew Cab Dually -2013 HitchHiker Champagne 38RLRSB - Travel with one Standard Schnauzer and one small Timneh African Gray Parrot, retired mechanical engineer
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07-18-2022, 05:00 AM
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#12
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Senior Member
Join Date: Oct 2019
Posts: 452
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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.
__________________
1999 American Dream 40DVS
Spartan Chassis, Cummins ISC 330
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07-19-2022, 11:52 AM
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#13
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Senior Member
Join Date: Mar 2019
Location: Braidwood Il.
Posts: 5,865
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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.
Quote:
Originally Posted by Meames1
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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__________________
95 Monaco Crown Royale
M11 400hp, 4060 trans.
Aquahot, Generac Guardian7.5k
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07-31-2022, 09:47 PM
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#14
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Senior Member
Join Date: Apr 2022
Posts: 229
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Quote:
Originally Posted by TXiceman
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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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.
__________________
1972 VW Westy Massive 2056cc T-4
Flight System G-Man 360 generator man (PM me)
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