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faviolosky 08-23-2009 03:13 PM

a/c just stopped
so i recharged my system about 3 days ago, it had previously been converted to r-134a, yet i wanted to refresh it and bough a few o rings and new fittings. i had the system vaccumed for about 30 minutes. Then i left it for about 10 minutes with the gauge connected to see if the pressure came back , and it didnt.

I went ahead and recharged it, and by the second can thats when the blue button turned on, and the compressor did too and i had A/C.
However yesterday i was driving home and the a/c was on and in one of those moments that i spaced out and came back the blue button was off and so was the compressor.

i pressed it a few times, moved the vents position selectors to many different positions,checked fuses(replaced blown ones), and it still wont turn on. what could be the possible cause of the blue light and compressor not turning on. please help its florida and its hot.:)

romeomike 08-24-2009 11:37 PM

Electrical Troubleshooting Manual (ETM) links

Download the appropriate one for your vehicle. Extensive AC troubleshooting section inside.

When you recharged, did you also add oil for the compressor?

Might have to add some dye and let it circulate to eliminate leaks in the system as an issue.

faviolosky 08-25-2009 09:48 AM

and i have it but it wont put the stuff in as the system is full, not leaks.

also i tried another push button, and nothing, #20 fuse is good.
Is there a relay for an unloader relay.

tried bridging the two wires for the pressure switch, but nothing happened, no sparks, nothing.

romeomike 08-25-2009 12:41 PM

There's a six-terminal relay called the Evaporator Temperature Regulator. It's a bit of a pain to get to as you have to remove the rear and center console to get to it. The ETM will help you in locating it.

Once it's out, you can apply the tests in the ETM to the socket it plugs into.

faviolosky 08-25-2009 05:05 PM

and this can cause the button to not turn on?

so its behind the center console??

i looked at the etm and there is a inline fuse of 2amps, and another one as well but is more an iode
also the relay k7 supplies the fuse #20 so lets see what happens.

romeomike 08-25-2009 07:33 PM

A twist in the tale
1 Attachment(s)
Unlike my two E30s (M42 and 325i), you have an eta and that doesn't have an ETR. Attached is a schematic that shows the electrical gauntlet that has to be negotiated for your AC to run.

Note in the lower left there is a compressor oil temperature switch on the eta.

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