My A/C is to old and they don't make replacement capacitors?

down home wrote:
...like a Chinook engine spooling up but boy does it through out cold air...

Sounds like our Coleman Mach 15! Cold, but I describe its two speeds as Extremely Loud and Louder Still.

What is the brand of the units?
Our front heat pump is only 13,500 and both are Coleman.
No problems now but did have to replace a capacitor, and sued a higher rated cap.
And recently fan slid down shaft of the rear 15,000 unit and ground itself into base plate. Coleman repaired it.
Front unit quiet but the rear is like a Chinnook engine spooling up but boy does it through out cold air.

I ended up having to replace the A/C unit but I hope that other guys will see the postings here and it will help them save a lot of money.A RV dealer wanted $1300 to replace the A/C unit in the rear. I bought two new modern and way more efficient units that draw way less power. I got the two unit with the low ceiling assemblies that have remotes/wall mount controls and renewed three years of Good Sam. All for $1800.12.

twainharteartist wrote:

CJW8 wrote:

twainharteartist wrote:
Thank you all for your help!! It has three canisters one I think is the start capacitor By Aeromet II M23P3725M00 (1499-566 9723 MRP210747) 25UF 370v
The other two Is most likely a soft start set.
Aeromet II M22P3707N00 (1499-546 9722 MRP210821) 7.5 uf 370V
Mallory 47-56MFD 165VAC (1497-07 ) (235-9647-02) Not sure how to test these.

Set VOM to Ohms. First Take a picture before you remove all connections of cap to be tested. Then short across the tabs with a screwdriver to discharge the cap. (voltage can be lethal!) Touch and hold capacitor tabs with meter leads and hold for several seconds while observing the meter. If nothing happens after 10-20 seconds, reverse the leads and repeat. If the meter starts counting up, wait till it stops, then reverse the leads and it should do the same thing each time you reverse the leads. If it does, cap is likely ok. If cap is bulged on top or in any way deformed, replace it. Google how to test capacitor if this isn't clear enough.

Thanks for the help. It looks like the Capacitor is good so I am going to replace the unit because of the age of the motorhome I will replace both front and rear units and be done with it.

LOL. Not laughing at you brother, laughing with you. Been there done that. While you are doing all this also check each grill outlet. The tape will deteriorate and let cool air leak into the roof cavity. You should also get better efficiency/performance compared to the old unit. Be sure the divider is taped in place well. I have mistakenly bought cheap aluminum tape but also found better stuff. If you need aluminum tape an ac supply house may sell the best quality.

CJW8 wrote:

twainharteartist wrote:
Thank you all for your help!! It has three canisters one I think is the start capacitor By Aeromet II M23P3725M00 (1499-566 9723 MRP210747) 25UF 370v
The other two Is most likely a soft start set.
Aeromet II M22P3707N00 (1499-546 9722 MRP210821) 7.5 uf 370V
Mallory 47-56MFD 165VAC (1497-07 ) (235-9647-02) Not sure how to test these.

Set VOM to Ohms. First Take a picture before you remove all connections of cap to be tested. Then short across the tabs with a screwdriver to discharge the cap. (voltage can be lethal!) Touch and hold capacitor tabs with meter leads and hold for several seconds while observing the meter. If nothing happens after 10-20 seconds, reverse the leads and repeat. If the meter starts counting up, wait till it stops, then reverse the leads and it should do the same thing each time you reverse the leads. If it does, cap is likely ok. If cap is bulged on top or in any way deformed, replace it. Google how to test capacitor if this isn't clear enough.

Thanks for the help. It looks like the Capacitor is good so I am going to replace the unit because of the age of the motorhome I will replace both front and rear units and be done with it.

twainharteartist wrote:
Thank you all for your help!! It has three canisters one I think is the start capacitor By Aeromet II M23P3725M00 (1499-566 9723 MRP210747) 25UF 370v
The other two Is most likely a soft start set.
Aeromet II M22P3707N00 (1499-546 9722 MRP210821) 7.5 uf 370V
Mallory 47-56MFD 165VAC (1497-07 ) (235-9647-02) Not sure how to test these.

Set VOM to Ohms. First Take a picture before you remove all connections of cap to be tested. Then short across the tabs with a screwdriver to discharge the cap. (voltage can be lethal!) Touch and hold capacitor tabs with meter leads and hold for several seconds while observing the meter. If nothing happens after 10-20 seconds, reverse the leads and repeat. If the meter starts counting up, wait till it stops, then reverse the leads and it should do the same thing each time you reverse the leads. If it does, cap is likely ok. If cap is bulged on top or in any way deformed, replace it. Google how to test capacitor if this isn't clear enough.

Rip all that out if your able put in a dual run cap with a had start and you will be good
to go

The big one (47-56uF) is probably the compressor start cap. The others may be start and run caps for the fan.

Again, if your compressor isn't humming and trying to start, changing the cap won't help.

Thank you all for your help!! It has three canisters one I think is the start capacitor By Aeromet II M23P3725M00 (1499-566 9723 MRP210747) 25UF 370v
The other two Is most likely a soft start set.
Aeromet II M22P3707N00 (1499-546 9722 MRP210821) 7.5 uf 370V
Mallory 47-56MFD 165VAC (1497-07 ) (235-9647-02) Not sure how to test these.

They still make 'em they just dont' make 'em for Coleman any more

As someone said look at what is printed Here are some things to consider

It will show a capacity (Farads or to be more precise Microfarads may say uF)

it will show a Voltage

Get one with AT LEAST that voltage, but not more than 2x the voltage

and try to get w2ithn 10% on the uF.. 20% should work but 10% is better.

Also check to see if a "Soft Start" kit is made for that unit... It will work too.