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#1
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Another strange AC problem
Have a strange AC issue. 1990 Miata. New compressor, expansion valve,
pressure switch, drier. All gauge values look good. Run it for a while, no set time. Then it will just stop and the rpm's will jump up to around 2000. can hit the switch and turn of the ac and the rpm's go back to normal. figure it is electrical at this point. any thoughts? |
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#2
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Another strange AC problem
On 7/21/2011 6:03 PM, Mac wrote:
> Have a strange AC issue. 1990 Miata. New compressor, expansion valve, > pressure switch, drier. All gauge values look good. Run it for a > while, no set time. Then it will just stop and the rpm's will jump up > to around 2000. can hit the switch and turn of the ac and the rpm's go > back to normal. figure it is electrical at this point. any thoughts? > The RPM jumps because the compressor clutch is dis-engaging. I'm not that familiar with a 90, so I don't know if the system uses an "amplifier" or not. If possible, I'd try to see if the compressor kicks back in when you cycle the A/C switch. There is a possibility that the pressure switch is shutting down the system, or as you said, some sort of other electrical fault. (Fan, relay, etc.) |
#3
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Another strange AC problem
On Sun, 24 Jul 2011 18:38:11 -0400, Mac > wrote:
>Thanks. Going to replace the ac compressor relay after I fine it. >Not sure of the location. any ideas? can't find it in my manual or >online. Nevermind, I figured it out. |
#4
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Another strange AC problem
Mac > wrote:
> Thanks. Going to replace the ac compressor relay after I fine it. > Not sure of the location. any ideas? can't find it in my manual or > online. Got these? http://neomiata.com/garage/index.php...ring+Diagrams/ -- XS11E, Killing all posts from Google Groups The Usenet Improvement Project: http://twovoyagers.com/improve-usenet.org/ |
#5
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Another strange AC problem
On 7/24/2011 8:51 PM, XS11E wrote:
> > wrote: > >> Thanks. Going to replace the ac compressor relay after I fine it. >> Not sure of the location. any ideas? can't find it in my manual or >> online. > > Got these? http://neomiata.com/garage/index.php...ring+Diagrams/ > > > > I hope the relay fixes the problem. Personally, I'd likely see if the A/C radiator fan is running after the compressor kicks out before I replaced the relay. On the other hand, the relay switches an inductive load, and after twenty years, it very well might have worn out. We had an 89 Mazda MPV that seemed to "eat" relays. A/C relay, Rear defroster relay, relays inside the turn signal module, electric "kickdown" relay, Overdrive relay, and so forth. The typical failure mode was contacts heating up, melting plastic, and then the contacts would not close. No shorts were ever found. I believe the relay mfr over spec'd the relays in the MPV since the failing relays were all the same part number, except for those in the turn signal module, which were made by the same mfr. |
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