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Miata not cooling

frankpc on Thu May 19, 2011 1:09 PM User is offline

Year: 1996
Make: Mazda
Model: Miata
Engine Size: 1800
Refrigerant Type: R134A
Ambient Temp: 71F
Pressure Low: -25
Pressure High: +25
Country of Origin: Japan


Hi - Newbie here. Miata recently stopped cooling. Pressing button to activate AC illuminates light, AC activated cooling fan runs, compressor turns but no cooling from air vents.

Engine off measured +8 low and high.

Engine on/AC on measured -25 low and + 25 high. The high is obviously not so good, I've learned enough here to be looking for at least 2.2 x 70 ...

Thoughts?

Thanks !

Frank

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Frank

TRB on Thu May 19, 2011 2:59 PM User is offlineView users profile

Check for signs of leaks. Is the compressor clutch turning on? Seems odd to be pulling a negative number without a restriction.

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frankpc on Thu May 19, 2011 3:49 PM User is offline


Thanks for the quick response.

Just checked again. Turning the A/C "on" definitely turns the compressor hub (as well as lighting the "AC" light on the dash and turning on the AC cooling fan on the radiator).
Pressures read -25 L /+25 H with AC on. Turning the AC off they quickly equalize at +15 L /+15 H

No obvious signs of any leaks on the hoses.

Thanks again,

Frank

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Frank

TRB on Thu May 19, 2011 4:17 PM User is offlineView users profile

Well you need to find out how much refrigerant is in the system. Very odd for thew system to be allowing a negative pressure is charged correctly. Has anyone added a refrigerant with sealer in it?

-------------------------

When considering your next auto A/C purchase, please consider the site that supports you: ACkits.com
Contact: ACKits.com

frankpc on Thu May 19, 2011 4:35 PM User is offline


We bought the car used in 2002 so I can't speak to the history before that. Since we've owned it - nothing has been added to the AC system. AC has worked fine the entire time - until two weeks ago.

With my limited knowledge here, I would have thought low refrigerant - but that doesn't square with the compressor spinning as the low pressure switch should inhibit that?

Thanks again ...

Frank


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Frank

TRB on Thu May 19, 2011 4:37 PM User is offlineView users profile

Could have a defective switch plus little to no refrigerant.

-------------------------

When considering your next auto A/C purchase, please consider the site that supports you: ACkits.com
Contact: ACKits.com

mk378 on Fri May 20, 2011 8:01 PM User is offline

Your car has almost no refrigerant left. It must have leaked out.

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