RV AC Repair
Roof air conditioning units are the same as ones used on other types of RV campers such as travel trailers and pop-up campers. Your motorhome AC system may have one or two units to help keep the camper cold, or warm if the RV AC units have optional heat elements. These repair and maintenance procedures are identical for all types of the aforementioned campers.
After a few seasons of use, it isn’t unusual for the AC unit(s) to not cool the motorhome as quickly or as efficiently as it once did. Even though you have kept the filters clean on a regular basis, the evaporator and condenser coils will eventually become coated with dirt and grime which inhibits airflow and cooling efficiency.
Before attempting any maintenance or repairs on the rooftop AC unit be sure to switch off the electrical supply to the unit, either by tripping the breaker or by unplugging the motorhome from the electrical receptacle. You are now ready to remove the RV AC shroud by unscrewing the four bolts securing it to the RV AC unit itself.
How To Clean The RV AC Coils
After removing the AC shroud you will be able to see the evaporator and condenser coils on either end of the RV AC unit.
If they appear similar to those in the photos at the right then they need a thorough cleaning. to allow unrestricted airflow through them.
A good wet/dry Shop Vac will help to keep you from making a big mess during the cleaning regimen.
Although regular household cleaners may clean the coils to a certain extent, AC coil cleaners made especially for the purpose will remove the grime build-up much more efficiently and will not harm the coils themselves. Several types of these fine products may be found on this page.
Follow the instructions carefully for the best results and use the Shop-Vac to remove any excess cleaner or grime from the RV AC unit. Use a coil fin comb to straighten any bent fins because they too will keep the airflow from moving through the AC coils efficiently.
These fin combs are very inexpensive and may be used many times in the future on both RV and home AC coil fins.
RV AC Fan Motor maintenance
While the RV AC shroud is removed, it is a good time to service the fan motor and clean the fans themselves. Whether your RV AC unit is made by Coleman, Carrier, Duotherm, or Dometic, it will have one fan motor which turns both the squirrel cage fan and the heat exhausting fan.
This motor should be oiled at this time.
If your RV AC fan motor has regular bearings in it there will be oiling ports at each end of the motor. It may be necessary to remove the top metal sheeting from over the fan motor to access the bearing oiling ports.
A few sheet metal screws will have to be removed to allow you access to the bearing ports add oil to the bearings.
If no oil ports are evident, then your rooftop AC unit has sleeves instead of bearings. You may still oil the shaft at the point where the sleeves are contained in the fan motor housing. The oil will seep inside and help the fan motor last much longer.
A fan motor with sleeves cannot be rebuilt economically, as can the bearing models, and must be replaced with a new one. Check the ads below to find the right fan motor for your RV AC.
How To Replace A Motorhome AC Fan Motor
As stated previously, a bearing model fan motor may be rebuilt fairly cheaply and will last for many more years. But not so a sleeved bearing AC fan motor.