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Re: Bent grates on the roof unit how serious of a problem...
That is what removes the heat from the hot gas, if bent or pluged, it will make the system work a lot harder. Just take a knife and straighten them back, or go to a supplyhouse for ac and ask for a coil fin comb to straighten back out fins on a coil!
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Could be any number of thing. Things you can check yourself, get on the roof and see if the vents at the back of the roof unit are clogged with dirt or if the fins on the condensor ( behind the cover) are bent. If so clean the vents and use a comb to straiten the vents so air can flow. You can wash this out with a garden hose. If that doesn't help and the unit is running the next stop is at a garage or camper store to see if the refrigerant level it low and if so why. Please be aware the refrigerant should not leak out if it is leaking there is a reason and while recharging the a/c will help for a while it is only a temporary remedy.
Sounds like your drains for drip pan under the evaporator area are plugged. They are located at the base of the AC unit on roof. Look real close under AC unit near front, for a hole in base plate of AC on each side. Water ( condensation ) should be dripping out of those holes pretty steady when running. You should have an inch or so clearance between base of AC and roof to try and get a bent piece of wire, or similar in to hole and try to clean it out. If that doesn't help you will have to remove plastic cover and remove all the screws that hold the front cover over the evaporator and remove the front metal cover. Look down at base of the coils and fins and you will see a drip pan that has small holes at each end for drainage. They will get plugged up with debris, thus poor, if any drainage. I use a long air nozzle and a small compressor to blow them and the tray out to clean it well. That will usually cure your problem. Please remember to shut all power to AC, off at breaker panel before removing the cover on roof to avoid electrical shock.
New gaskets and foam blocks should always be used when replacing or reinstalling the ac unit. With that in mind, as long as you have no "new" noise or vibration when the unit is running, no loss in efficiency or any leaks, you should be fine. If you're near an authorized service center, have a tech go up and take a look just to make sure all is well.
Yes, that is the tube that was used to charge the unit...after the charging process the tube is often bent over, crimped and then soldered shut... that is perfectly normal and you should be okay...
motor mount loose, fan grate loose, fan off balance, or the motor bearings could be wearing out. put your hand on the top of the motor grate. if by you putting your hand on it the buzzing stops, the hardware may need tightening. if it vibrates violently, the fan is off balance or the motor bearings are worn. if the blades are bent, you may be able to bend them back. if the bearings are shot, you need a new motor.
I think you have a high pressure cutoff cycling the compressor on and off. Clean the filter inside the unit. Then with a hose clean out the foil condenser filter on top of the camper. Also you may need to buy a coil comb and comb out bent or damaged areas of the condenser coil on the unit that is above the roof of the camper.
First thing I would ask is did they locate the leak in the system before they recharged it? Your answer is YES to all three of your questions. If the unit is overcharged you can get what is called a liquid flood back to the compressor and this condition can cause compressor failure. Fans are balanced at the factory when manufactured. If a blade is bent or damaged it will throw it out of balance.