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A/C Compressor: No Start #4473136
07/28/17 02:04 PM
07/28/17 02:04 PM
Joined: Feb 2010
Posts: 4,838
Central Texas
sleddriver Offline OP
sleddriver  Offline OP
Joined: Feb 2010
Posts: 4,838
Central Texas
Last night I turned down the t-stat from 82 to 79F and after a bit noticed it wasn't blowing cold air. Went outside to discover the condensor fan running & blowing cool air. Not good! Too late to do anything about it. Fortunately inside is quite dry so I slept under a ceiling fan.

Today I checked the start cap with a capacitance meter: 95uF. The ESR meas. 40 mOhms. The cap is about 20yrs old now. The start kit is a Lennox LB-34803BAL. Spec'd as: 88 - 108uF @ 330VAC. So despite its age, it's within the range.

Next I Ohm'd the compressor: No open windings. Run is .8 Ohm, Start is 3.1 Ohm. That's OK. Therefore the compressor isn't Tango Uniform.

Next I have a look at the fan/cmprsr cap I replaced a few years back. Top is a bit rusty....and badly bulged! Labeled as a 40 + 5uF, but the cap meter shows 0uF. ESR meter reads infinite. It's cooked....trying to burst out of its aluminum can. Odd the cndsnr motor would run....

I'd gone to an electric motor shop hoping to get a good cap. This is a Proline PB400Z050T440CA made in Mexico in GE's old cap. plant. I'm guessing 1134 is the date code. 34th week of 2011.

I think I found why the A/C quit.....


1998 Volvo V70 T5 228,880 mi. Original Owner.
M1 10W-30 HM
"It's never a mistake to buy tools, defined broadly. They're not a cost, they're an investment." - J.B. Peterson
Re: A/C Compressor: No Start [Re: sleddriver] #4473157
07/28/17 02:45 PM
07/28/17 02:45 PM
Joined: Nov 2008
Posts: 3,280
Oshawa, Ontario Canada
JC1 Online content
JC1  Online Content
Joined: Nov 2008
Posts: 3,280
Oshawa, Ontario Canada
I had a cap blow last year. My AC unit is 15 years old.


2015 Grand Caravan SXT Plus 5w-20 PPPP/Fram Ultra Filter
1997 Honda Civic CX 5w-30 Shell Conventional/Fram Ultra Filter
Re: A/C Compressor: No Start [Re: sleddriver] #4473259
07/28/17 05:15 PM
07/28/17 05:15 PM
Joined: Sep 2007
Posts: 1,022
TX, USA
JMJNet Offline
JMJNet  Offline
Joined: Sep 2007
Posts: 1,022
TX, USA
Try to Amrad Capacitor or Genteq Capacitor.
I had one of those Amrad failed but it was under 5 years so they sent me a new one.

Both are on ebay or Amazon from Airstar out of Florida.

Test them and then keep them as spare.

I always try to test the capacitor every Spring before turning the AC for the first time of the season before it gets really hot.

Last edited by JMJNet; 07/28/17 05:17 PM.

  • 2017 Toyota Sienna
  • 1995 GMC Suburban 6.5L Turbo Diesel


Re: A/C Compressor: No Start [Re: sleddriver] #4473289
07/28/17 06:06 PM
07/28/17 06:06 PM
Joined: Feb 2010
Posts: 4,838
Central Texas
sleddriver Offline OP
sleddriver  Offline OP
Joined: Feb 2010
Posts: 4,838
Central Texas
I did find an Amrad at the motor shop. About $45. They quit carrying the "Proline". Evidently the shop had numerous complaints.

Now to install, get her buttoned up and cool down the house. Currently it's 88F indoors and 103F out.


1998 Volvo V70 T5 228,880 mi. Original Owner.
M1 10W-30 HM
"It's never a mistake to buy tools, defined broadly. They're not a cost, they're an investment." - J.B. Peterson
Re: A/C Compressor: No Start [Re: sleddriver] #4473380
07/28/17 07:45 PM
07/28/17 07:45 PM
Joined: Feb 2010
Posts: 4,838
Central Texas
sleddriver Offline OP
sleddriver  Offline OP
Joined: Feb 2010
Posts: 4,838
Central Texas
Back to cold casa air!

I'm misting the cndnsr to give it a boost. The evprtr is sweating. Suction line warmer than usual where it exits the evap. so the TXV must be wide open.


1998 Volvo V70 T5 228,880 mi. Original Owner.
M1 10W-30 HM
"It's never a mistake to buy tools, defined broadly. They're not a cost, they're an investment." - J.B. Peterson
Re: A/C Compressor: No Start [Re: sleddriver] #4473569
07/28/17 11:42 PM
07/28/17 11:42 PM
Joined: Feb 2013
Posts: 11,081
Phoenix, AZ
Nick1994 Offline
Nick1994  Offline
Joined: Feb 2013
Posts: 11,081
Phoenix, AZ
Good work, you're a trooper for dealing with no a/c overnight. I would have been staying at family's house for the night or in a hotel. Too hot!


2015 Hyundai Sonata 2.4L 88k Motorcraft Synthetic Blend 5w30 & OEM
2000 Toyota Camry 2.2L 231k Valvoline 5w30 & Fram Ultra
1996 Jeep Cherokee 4.0L 147k Mobil 1 HM 10w40 & Fram Ultra
Re: A/C Compressor: No Start [Re: sleddriver] #4476391
08/01/17 09:35 AM
08/01/17 09:35 AM
Joined: Feb 2010
Posts: 4,838
Central Texas
sleddriver Offline OP
sleddriver  Offline OP
Joined: Feb 2010
Posts: 4,838
Central Texas
Time to buy back-up capacitors......


1998 Volvo V70 T5 228,880 mi. Original Owner.
M1 10W-30 HM
"It's never a mistake to buy tools, defined broadly. They're not a cost, they're an investment." - J.B. Peterson
Re: A/C Compressor: No Start [Re: sleddriver] #4476434
08/01/17 10:34 AM
08/01/17 10:34 AM
Joined: Nov 2008
Posts: 9,279
Phoenix
dishdude Offline
dishdude  Offline
Joined: Nov 2008
Posts: 9,279
Phoenix
I'm starting to wonder if it is worth proactively replacing caps every 5 years or so.


2018 Challenger SRT 392 PUP 0w-40 Wix 57899XP
2018 GTI
Re: A/C Compressor: No Start [Re: dishdude] #4476679
08/01/17 03:00 PM
08/01/17 03:00 PM
Joined: Jul 2014
Posts: 128
North TEXAS
oldoak2000 Offline
oldoak2000  Offline
Joined: Jul 2014
Posts: 128
North TEXAS
Originally Posted By: dishdude
I'm starting to wonder if it is worth proactively replacing caps every 5 years or so.


THAT and the contactor relay too every 5 yrs = maximize life of compressor in these HOT climate areas!

Cheap to order them online BEFORE they fail rather than scrambling to replace ASAP when fail in middle of summer. . .

Re: A/C Compressor: No Start [Re: sleddriver] #4479880
08/05/17 11:18 AM
08/05/17 11:18 AM
Joined: Oct 2009
Posts: 3,947
Ohio
L_Sludger Offline
L_Sludger  Offline
Joined: Oct 2009
Posts: 3,947
Ohio
You should stock them like light bulbs!


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