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Topic: AC fan run capacitor  (Read 510 times) previous topic - next topic

AC fan run capacitor

Coach has original Dometic DuoTherms (1998). Rear air has been noisy and stopped running today. Pulled the capacitors and the start capacitor tested good 47mu but fan run capacitor at first tested 9.9 on one side and zero on the other.  It is a dual 20+10uf 370vac CsC brand. Now I tested it again and 0 0 on both legs. A quick internet search found this at two rv supply houses for $70 to $85. A Jard is $18 on EBAY. Can this be purchased at an HVAC supply house ? I'm going into McKinney TX tomorrow. Couple HVAC supply houses in town.

The start capacitor looks newer, should both be replaced? Thanks. This is not in my normal line of work. A little jumpy as I removed them. Never messed with them before.
1998 36 foot U270 Build No. 5328 WTFE, 900 watts solar, Victron controller, B2B, bat monitor, 600 AMPH lithium with 2018 Chevy Colorado toad, SKP #110239, Motorcade #17781, 2021 Escape 17B for when Coach is broken down and campsites are too small, retired and full-timer since Dec. 2020. Part of RV family since 1963.

Re: AC fan run capacitor

Reply #1 –
I can't help with the capacitor but on mine when they were noisy I found the mounts were worn out
and I replaced the ones that were worn out and now it is quiet.
Peter and Frieda Morin
1999 36ft. U320 Foretravel
Build # 5436
1998 Suzuki Sidekick Sport

Re: AC fan run capacitor

Reply #2 –
A/C supply houses stock them. Make sure the squirrel cage spins. The bearings go out on the fan motors and makes them noisy.
1999 40 ft. U-320 wtfe build 5563 Chuck & Lynda's "Rollin' Inn"  2030 watts solar
prev. mh's 71 GMC 5 yrs. 73 Pace Setter 1 yr. 78 Vogue 5 yrs 81 FTX 40ft all electric 18 yrs. 1996 Monaco Signature 3 yrs.
2014 Grand Cherokee Overland
Dream as if you will live forever. Live as if you will die today.  James Dean

Re: AC fan run capacitor

Reply #3 –
I just replaced them in both of mine. Got them from Amazon. Check an see if there is a Grangers they likely will have them
Bruce, Linda, and Macy
Zoey RIP 1/20/19
1999 U295 40' build #5400
2017 silver Jeep Wrangler, 1260 watts of solar on top
Moving around the country

Re: AC fan run capacitor

Reply #4 –
Patric, I have replaced the capacitors in both my 24 year old A/C's as well as home A/C's a couple of times. I would purchase them at a local HVAC shop and would suggest that you replace both start and run capacitors as long as you are up on the roof and have the cover off.

Richard
Jan & Richard Witt
1999 U-320  36ft WTFE
Build Number: 5478 Motorcade: 16599
2011 Jeep Wrangler Unlimited w/Air Force One
Jan: NO5U, Richard:KA5RIW
The selected media item is not currently available.

Re: AC fan run capacitor

Reply #5 –
If you can't find the duel capacitor there is room in there to have 2 single capacitors. If you have to go this route you will need to make up a longer jumper wire, the HVAC store will show you which leads will need to be jumped so you have essentially a duel capacitor.

Mike
Pamela & Mike 97 U 320

"It's not what happens to you, but how you react to it that matters."

Re: AC fan run capacitor

Reply #6 –
What Mike said.  Also check that PTCR and smell it.  If it smells burnt at all then replace it.  Don't get cheap chinese capacitors, MARS or made in USA are normally excellent.
PTCR Device
2014 Newell 2020P

Re: AC fan run capacitor

Reply #7 –
I replaced most of my capacitors just before the compressor locked up

I have a box of capacitors if you want them
Postage plus 10$

Re: AC fan run capacitor

Reply #8 –
My noisy unit was one of the Freon lines bumping against the housing do to a bad clamp. Would have worn thru for sure eventually. Amazing how much noise it was making. With the unit running and the cover off put your hands on all the lines, be careful as they can be hot enough to burn unprotected skin.
Scott

Re: AC fan run capacitor

Reply #9 –
Thanks for the help. Not able to source locally but have ordered on Amazon.
1998 36 foot U270 Build No. 5328 WTFE, 900 watts solar, Victron controller, B2B, bat monitor, 600 AMPH lithium with 2018 Chevy Colorado toad, SKP #110239, Motorcade #17781, 2021 Escape 17B for when Coach is broken down and campsites are too small, retired and full-timer since Dec. 2020. Part of RV family since 1963.

Re: AC fan run capacitor

Reply #10 –
Found a Jard 20+10 uf dual capacitor on Amazon from North American HVAC. Installed and AC now working. Certainly helped to photograph the wiring and label wires prior to removal. Thanks for all the help. Cost was $16.00. Ordered a spare as this particular capacitor is mostly used on these older Coleman ACs and not generally available except for $70 to $85 from a couple RV suppliers. About one week to get one from anywhere.
1998 36 foot U270 Build No. 5328 WTFE, 900 watts solar, Victron controller, B2B, bat monitor, 600 AMPH lithium with 2018 Chevy Colorado toad, SKP #110239, Motorcade #17781, 2021 Escape 17B for when Coach is broken down and campsites are too small, retired and full-timer since Dec. 2020. Part of RV family since 1963.

Re: AC fan run capacitor

Reply #11 –
Your coach should have had Dometic air conditioners from the factory. If it has Coleman some one must have changed them.
previous 1984 35 ft ORED 250 HP 3208 Cat       
previous 1998 40 ft U295 CAI 325 hp Cummins
previous 2003 40 Ft u320 build #6140 450 Cummins M11.                                                         
1999 Mazda Miata
Ron, Nancy, Tipper the cat, Max The dog
1997 U 270 36 ft build number 5174 8.3 Cummins

Re: AC fan run capacitor

Reply #12 –
I stand corrected. It's a Dometic Penguin Duo-Therm. The AC capacitor comes up in searches as Coleman RV AC.
1998 36 foot U270 Build No. 5328 WTFE, 900 watts solar, Victron controller, B2B, bat monitor, 600 AMPH lithium with 2018 Chevy Colorado toad, SKP #110239, Motorcade #17781, 2021 Escape 17B for when Coach is broken down and campsites are too small, retired and full-timer since Dec. 2020. Part of RV family since 1963.