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Old 03-27-2023, 08:42 PM   #1
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Dometic AC Covers Melting

My ac Covers are melted. Any sugestions as to why
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Old 03-27-2023, 10:57 PM   #2
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Most covers are ABS and hopefully white. ABS has a max operating temperature of 176F. If they are melting, they would need to be getting hotter than that.

The source of heat is the condenser coil which normally runs ~130F. If the condenser coil is over temperature and cannot reject enough heat, that would likely caused by poor airflow. Poor airflow can be caused by 1) clogged condenser coil fins or 2) low fan speed. Since the blower motor for roof A/C drives both evaporator and condenser fans, (usually?) you should be able to know if the evaporator fan is not running while standing inside. It is remotely possible the fan blade is damaged or loose or fallen off, or loose on the shaft?
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Old 03-29-2023, 07:45 AM   #3
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A bit of history helps did/do they work properly. So you bought it that way with melted covers? I have never read a post of covers melted. Generally if someone's AC is not working properly it will blow hot air so they will shut it off.... but then two covers????
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Old 03-29-2023, 10:07 AM   #4
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Hard to imagine that the a/c condensers get hot enough to melt ABS in open air. Even if the vent holes in the cover are plugged (but check them to be sure!). Maybe run the a/c with the covers off and use a infrared thermometer to get the surface temperature of the condenser fins to see if they are exceeding 130 or so.
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Old 03-29-2023, 06:58 PM   #5
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Post a picture of the covers. are they really melting or just getting deformed? UV light from the sun will cause them to harden and change color. My black on us turning white and the top is changing shape. Same thing on my refrigerator roof vent. I have tried different types of protectants and none seem to help.
Getting ready to order white ones.
Also possible if you are running the fan on low. May not be moving enough air to cool the condenser. Same motor runs the condenser and blower fan.
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