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Why Do The Coils On My RV's Air Conditioner Keep Freezing Up?

by Brad
(Houston, TX)

My Coleman A/C freezes up, the coils are clean, on high blow, I set A/C to 75 during the day no problem. At night it is set to 70. Depending on the ambient temp it may freeze up, it simply won't cycle. Yesterday it would cycle off not on. I had to keep setting the temp lower to get the A/C to come on. The temp inside the RV was 78 after 30 minutes and still not on. Eventually I set the temp at 60 and came on ran all night got cold and froze up.

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ANSWER: Greetings Brad thanks for submitting your question on our Ask An RV Question Page.

My best guess is that you have a bad thermostat on the A/C. I am opening up this question to our visitors since I am not real familiar with Coleman Air Conditioners. Maybe one of our visitors have had the same problem and can give you information on how they fixed it.

If you have an answer to this question please click on the "Click Here To Post Comments" link located near the bottom of this page.

Happy RVing

RVing Al

Comments for Why Do The Coils On My RV's Air Conditioner Keep Freezing Up?

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starstarstarstarstar 		Rv A/c freezes up
by: Anonymous

We also have a fifth wheel camper that the main a/c freezes reguardless of the temp setting. The unit in the bedroom operates just fine.
Rating
starstarstarstarstar 		Bad build quality
by: Anonymous

Open up the unit cover inside the camper. There’s a foam price that separates the supply air from the return air. Ours was not sealed at all, and it fell out of place, so the unit was recycling the air before it would distribute to the trailer and froze the coils up. Get some foil hvac tape, place the foam separator back in place and seal it up with the tape.
Rating
starstarstarstarstar 		Ac freezing up
by: Sharon phillips

Why is my 2018 5th wheeler ac freezing up ???? I keep it set on high auto at 78 degrees daytime we live in north Florida. Both ac units are set the same , last night 8 21 18 it was not humid out side and it was coming on and off for 3 to 5 seconds the shifting off .
Rating
starstarstarstarstar 		Ac
by: Anonymous

Why dose my 2018 5th wheel trailer ac keeps freezing up it's set at 79 high fan run 24 7 compressors kicks on like it's supposed to but it still freezes up at night it's new we only had it for 4 months and had problems ever since, what can we do .
Rating
starstarstarstarstar 		RV ac freezing up
by: Carl

(2) things here
1 thermostat turns unit completely on and off
2 frost probe turns compressor off unit stays on
if the unit does not turn off and the coils freeze up then why isn't the compressor cutting off to stop the freezing affect isn't that what the freeze probe is supposed to do.I had one freeze up so bad it took several hours to deice i only notice it when we are going to sleep and my wife turns it to 70 degrees.Dealer played with seal tape and moved the probe no luck unit is now 1 year 6 months old. Trying to figure it out myself
this looks like a common problem no one can figure out on these RVs.
Rating
starstarstarstarstar 		Coleman AC
by: Anonymous

My AC keeps freezing up . Had a tech come out and called RV tech where I bought my Keystone .. they all say air flow they put silver tape around air intake side said air was getting to out air flow side . Tech came out twice but AC still freezes up and they say nothing is wrong with AC .Could it be the medal plate on out flow side that makes the air flow thru the air ducts in Rv I have 7 vents thru out RV ..
Rating
starstarstarstarstar 		Coleman Mach 15
by: Anonymous

Having same trouble on my brand new puma 2017 ---first time using my camper ---unit keeps freezing up jacked trailer up a little in front seemed to help a little but still freezing up
Rating
starstarstarstarstar 		RV ac freezing up
by: Rob

A/C freezes up because:
1. Dirty
2. Weak fan capacitor or restricted air flow
3. Weak compressor or low refrigerant

30 years experience in HVAC. Start with the first 2 because those are most common cause for freeze ups barring component failure.

Number 3 is troublesome for non professionals.
I suggest making sure 1 and 2 are taken care of because it's inexpensive and doable. 3 involves soldering access valves and using gauges and seals system evaluations which no one does due to expense. Most RV air conditioners are evaluated by temperature drops, amp draw and serviceability.
Sometimes troubleshooting a sealed system can cost half the price of new. Deal with someone you trust.
Rating
starstarstarstarstar 		rv coils freezing
by: david

i have the same issue. i think its my thermostat or the freeze sensor located on my evap coil.

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