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92 buick roadmaster 5.7 a/c problem92 buick roadmaster a/c works great until something kicks the compressor off, then if you disconnect the battery terminal or unplug the fuse it does a countdown and works fine again until it happens again. please help !!
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longryder
New User
Jun 6, 2010, 1:41 AM
Post #1 of 10
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92 buick roadmaster 5.7 a/c problem92 buick roadmaster a/c works great until something kicks the compressor off, then if you disconnect the battery terminal or unplug the fuse it does a countdown and works fine again until it happens again. please help !!
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92 buick roadmaster a/c works great until something kicks the compressor off, then if you disconnect the battery terminal or unplug the fuse it does a countdown and works fine again until it happens again. please help !!!
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Hammer Time
Ultimate Carjunky
/ Moderator
Jun 6, 2010, 4:12 AM
Post #2 of 10
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Re: 92 buick roadmaster 5.7 a/c problem92 buick roadmaster a/c works great until something kicks the compressor off, then if you disconnect the battery terminal or unplug the fuse it does a countdown and works fine again until it happens again. please hel
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Your just fighting the automatic system. The system is shutting down for a reason and by continuing to over ride it, you are probably doing damage to the system. The first thing you need to do is have a set of gauges put on it to determine what is going on in the system. It could be very low of refrigerant, which would mean it has a leak to find.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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longryder
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Jun 6, 2010, 5:08 AM
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Re: 92 buick roadmaster 5.7 a/c problem92 buick roadmaster a/c works great until something kicks the compressor off, then if you disconnect the battery terminal or unplug the fuse it does a countdown and works fine again until it happens again. please hel
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thanks for the reply hammertime it was checked with gauges when the freon and oil was put in the unit and blows real cold and works good. last time it worked for 4 weeks before it kicked off again. the first time it happend i put another compressor on thinking the other 1 had gone bad and had it refilled with freon and oil with the guages. it shows good by guages. this a/c unit works with the computer on the car i was wondereing if there might be a relay or something gone bad.
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Hammer Time
Ultimate Carjunky
/ Moderator
Jun 6, 2010, 5:10 AM
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Re: 92 buick roadmaster 5.7 a/c problem92 buick roadmaster a/c works great until something kicks the compressor off, then if you disconnect the battery terminal or unplug the fuse it does a countdown and works fine again until it happens again. please hel
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Sure it can be, among dozens of other possibilities also.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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longryder
New User
Jun 6, 2010, 5:15 AM
Post #5 of 10
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Re: 92 buick roadmaster 5.7 a/c problem92 buick roadmaster a/c works great until something kicks the compressor off, then if you disconnect the battery terminal or unplug the fuse it does a countdown and works fine again until it happens again. please hel
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i wonder what is the best and cheapest way to run the problem down ???
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Tom Greenleaf
Ultimate Carjunky
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Jun 6, 2010, 5:41 AM
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What refrigerant is in this system now? Why are you adding oil and how much of what type?
My bet is you've added a sealer, oil, and gas kit all in one which if it doesn't work pretty much destroys the whole system!
T
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Hammer Time
Ultimate Carjunky
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Jun 6, 2010, 5:42 AM
Post #7 of 10
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Re: 92 buick roadmaster 5.7 a/c problem92 buick roadmaster a/c works great until something kicks the compressor off, then if you disconnect the battery terminal or unplug the fuse it does a countdown and works fine again until it happens again. please hel
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The best and cheapest way will be to give it to a professional to troubleshoot. You have an Auto temp control system that could have an electrical overload at any point, a restriction in the system or a faulty electronic component. Unless you have the proper equipment and diagnostic info, your not going to get very far.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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longryder
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Jun 6, 2010, 7:18 AM
Post #8 of 10
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Re: 92 Roadmaster
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thanks for your reply tom, i only added freon and oil when i thought the compressor had quit and put another 1 on it. after i recharged the system after the compressor change it would blow cold and everything would work fine until about 4 weeks later the compressor quit again until i pulled the fuse and put it back in then the climate control did a countdown and it all worked again.
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Tom Greenleaf
Ultimate Carjunky
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Jun 6, 2010, 9:53 AM
Post #9 of 10
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Re: 92 Roadmaster
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Here's a great link to read:
http://autoforums.carjunky.com/..._A/C_SYSTEMS_P45460/
Here's the scoop as I see it.
1. Freon hasn't been made new since 1993. Freon is Dupont's brand name for R-12 which this car was made with new.
2. Original charge for the car (charts can be wrong) was 50 ounces of R-12 and 8 ounces of mineral A/C oil.
3. Most cars of that age have already had issues and most would have been converted to R-134a. You have to tell me/us what refrigerant is being used now and what type of oil as they are not compatible. You may still have R-12 leftover or may have the cert to buy it now all just recovered product but available with the cert only now.
* If there are unknowns along the way you really need to start from scratch with entire system empty and to get oil out would need flushing, then add proper oil throughout system for the refrigerant used. Now if the system was retrofitted to 134a you need to know what else might have been changed. If a new condenser is in the history many reduced system capacity and came with a decal to put under the hood saying just what. When a car gets converted to 134a you start with known weight of ~70% of what it would have been for R-12. Some will peak out performance at 80%.
Either way you need to know for perfecting it. You can get real close by observing pressures - both high and low sides.
What's is in there now? You really can't just add refrigerant without knowing several observations or if overcharged it will quit or lock up on you. The refrigerant carries the oil to lube the compressor. Mineral only won't move with 134a! Compressor would burn out in no time. You may have gotten lucky with one time of over the counter 134a and said it lasted 4 weeks so. Fine, now it either leaked out or is messed up in other ways depending on what's in there now.
Systems are designed to shut down on purpose when pressures aren't within spec vs the temps as this car probably uses a thermistor for cycling clutch or shutting it down either because it's too cold or when pressure noted low enough stays in shutdown mode till reset after fixing the problems,
T
PS: Did you put a new compressor in this? If system was even opened up you must start from a well held full vacuum or it won't last or work for beans....
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KeystoneAutoElectrical
New User
Jun 6, 2010, 4:40 PM
Post #10 of 10
(6323 views)
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Re: 92 buick roadmaster 5.7 a/c problem92 buick roadmaster a/c works great until something kicks the compressor off, then if you disconnect the battery terminal or unplug the fuse it does a countdown and works fine again until it happens again. please hel
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Hi longryder,
I think the electronic climate control in that car measures how many times the clutch cycles in a given period, if it cycles too much it cuts out and won't restart unless you disconnect the battery. I would like to know the ambient temps in your area when this happens. And also if you get a small accurate thermometer and install it in your center vent that may shed some light on the problem.
Please remove the advertising link from your signature ASAP. It's not allowed
(This post was edited by Hammer Time on Jun 6, 2010, 4:42 PM)
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