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#4473136 - 07/28/17 03:04 PM A/C Compressor: No Start
sleddriver Offline


Registered: 02/06/10
Posts: 4609
Loc: 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 226,808 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

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#4473157 - 07/28/17 03:45 PM Re: A/C Compressor: No Start [Re: sleddriver]
JC1 Offline


Registered: 11/29/08
Posts: 3010
Loc: 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/Wix Filter
1997 Honda Civic CX 5w-30 PPPP/Mahle Filter

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#4473259 - 07/28/17 06:15 PM Re: A/C Compressor: No Start [Re: sleddriver]
JMJNet Offline


Registered: 09/06/07
Posts: 934
Loc: 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.


Edited by JMJNet (07/28/17 06:17 PM)
_________________________
  • 2017 Toyota Sienna
  • 1995 GMC Suburban 6.5L Turbo Diesel



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#4473289 - 07/28/17 07:06 PM Re: A/C Compressor: No Start [Re: sleddriver]
sleddriver Offline


Registered: 02/06/10
Posts: 4609
Loc: 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 226,808 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

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#4473380 - 07/28/17 08:45 PM Re: A/C Compressor: No Start [Re: sleddriver]
sleddriver Offline


Registered: 02/06/10
Posts: 4609
Loc: 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 226,808 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

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#4473569 - 07/29/17 12:42 AM Re: A/C Compressor: No Start [Re: sleddriver]
Nick1994 Offline


Registered: 02/19/13
Posts: 10129
Loc: 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 79k PU 5w30 & OEM
2000 Toyota Camry 2.2L 228k M1 AFE 0w30 & Wix
1996 Jeep Cherokee 4.0L 146k M1 HM 10w40 & Fram Ultra

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#4476391 - 08/01/17 10:35 AM Re: A/C Compressor: No Start [Re: sleddriver]
sleddriver Offline


Registered: 02/06/10
Posts: 4609
Loc: Central Texas
Time to buy back-up capacitors......
_________________________
1998 Volvo V70 T5 226,808 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

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#4476434 - 08/01/17 11:34 AM Re: A/C Compressor: No Start [Re: sleddriver]
dishdude Offline


Registered: 11/14/08
Posts: 8757
Loc: Phoenix
I'm starting to wonder if it is worth proactively replacing caps every 5 years or so.
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2018 Challenger SRT

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#4476679 - 08/01/17 04:00 PM Re: A/C Compressor: No Start [Re: dishdude]
oldoak2000 Offline


Registered: 07/23/14
Posts: 119
Loc: 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. . .

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#4479880 - 08/05/17 12:18 PM Re: A/C Compressor: No Start [Re: sleddriver]
L_Sludger Offline


Registered: 10/04/09
Posts: 3947
Loc: Ohio
You should stock them like light bulbs!
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too many cars and oil combinations to list in 150 characters or less

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