Dash A/C Low Pressure Port Location

[loligag]

I need to top off the R134a in my dash a/c system. I assumed the low pressure port is on the firewall area behind generator but I can't seem to locate it. Does anyone have a photo or directions to the location of the port on a 2005 Monaco Dynasty? Thanks, getting hot here in coastal Alabama. George

[Dsallach]

I do not have the same coach but, on my Monaco Windsor when you pull the generator out the a/c ports are on the passenger side just o the left of the opening. Hope that helps.

[RobRoy]

You will most likely have to follow the low-pressure line back from the compressor because no two of these contraptions are alike due to as built options.

It shouldn't be hard to find with a bright flashlight and follow the lines.

I will say you should look at the pressures both high and low. Adding too much refrigerant to a a/c system will kill the compressor. You may add refrigerant to your system by the seat of your pants and think everything is fine and dandy and the truth has you overfilled the system and will kill the compressor over time due to excessive high side head pressure and longer than normal cycling and you won't have a clue as to why the compressor failed.

Gages are relativity cheap in comparission to a catastrophic compressor failure. https://www.ebay.com/i/272181039751?chn=ps&dispItem=1

Yes indeed millions have added refrigerant to the low side and brought it back to life, it's a billion dollar market. Yes, products like a/c pro have a gage, but only on the low port.

IMO you may be better off with no low gages at all and feeling the lines holding your hand in and out of the evaporator with your hand until they equalize temp wise, than using a low side only reading for accuracy.

Many people have also overfilled their system without gages and thought everything was O.K. .....and not have a clue as to why their a/c compressor failed down the road. A/c compressors can get expensive very very expensive to repair.

My intentions are not to scare you but only give you some facts, so that you don't dig a deeper hole.

Happy Hunting

[loligag]

Thanks to both responders. I have spent most of my search on the passenger side but will now concentrate in the area you mentioned mmediately to the left of the opening.

[Dsallach]

RObRoy is right. Follow the lines from the compressor forward and you will find the ports. Also Harbor freight has high/low a/c gauges on sale this weekend for $48. That a lot cheaper than a compressor.

[8.3Oilbuner]

Hi Loligag; The dash A/C lines should be in the upper left above the generator. If they are still there, there should be covers on the charge ports. Red cover for the high pressure side and a blue or green cover for the low pressure or suction side. Also but not always, the low pressure hose is usually larger in diameter than the high pressure hose. Also when the compressor is running, the low pressure or suction side is the hose that is cold or has condensation on it. As Robroy mentioned, it is best to have gauges that connect to those ports I have mentioned. It is better to have less Freon in the system that too much. As outside temps rise, so does the pressure in the A/C system. Be careful and good luck!

[Woodman018]

My coach is a 2004 Executive so it is different than yours but my ports are right in front of the compressor under the engine cover in the back closet. I weigh the refrigerant to make sure I have the proper amount after I vacuum the system down.

[loligag]

Thanks everyone for the suggestions and information. After reading Woodman's post I finally looked in the engine compartment and sure enough both ports are immediately forward of the compressor and easily assessiable from the rear of MH. Only potential gotcha for fellow Dynasty owners is the compressor belt is very close to ports so watch the hoses when filling. We now have cold dash air again. Hopefully it will be another 17 years before I need to service it again...or not.

[ZackMan]

Originally Posted by Woodman018

My coach is a 2004 Executive so it is different than yours but my ports are right in front of the compressor under the engine cover in the back closet. I weigh the refrigerant to make sure I have the proper amount after I vacuum the system down.

Woodman018,

Did you open the a/c system up? Why did you vacuum out before adding refrigerant?

I am curious because last year the service center I took my coach to found a leak at one of the couplers on the high pressure side and so it was replaced.

The system was evacuated, vacuumed and refrigerant added to match the capacity ounces required.

Did you have a similiar issue?

[hypoxia]

While it has a charge use soap spray to find leaks. The crimped connections fail as do the charging port valves. Look for oil on the hose, refrigerant travels with oil.

Refrigerant doesn't dissappear without an escape route. I replaced both hoses on the compressor and dryer as well as charging port valves due to leaks last year.

[Woodman018]

Zackman,

I had a similar issue. When I bought my coach the AC was not cooling as it should. It was basically out of freon. I looked the system over and the compressor was all covered with oil so that was probably most of my leak. I installed a new compressor, dryer and expansion valve. I vacuumed the system down and recharged it with 4 Lb of R134A and added the oil that came with the new compressor. It worked all last summer just fine , but it has lost it's charge again and I now have a leak at a hose crimp fitting back by the condenser. I have purchased a manual crimping tool ( Mastercool 71550) and hose ferrules to do that repair. I really don't want to pull out all of that hose. I also have questioned if my expansion valve is working correctly so I will be installing another new one and also replace my dryer since I will have the system opened up again. While I'm at it, I will look at the evaporator again to make sure it isn't leaking. Hopefully when I am done it will last a lot longer this time.

Dave