ECC display flashes (Update 3/31/08) - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 11-27-2007, 12:34 AM   #1
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Default ECC display flashes (Update 3/31/08)

My ECC display flashes shortly after startup, although the climate control still seems to be completely functional. I've been experiencing this issue for a while since I had a battery problem a while back ( http://www.bonnevilleclub.com/forum/...ic.php?t=86272 ), but I expected the ECC to stop flashing after 40-50 startups. Well, it'* still flashing every time I start the car, so I need suggestions . It flashes for about 1-2 minutes, then stops and seems to function normally. Any help is greatly appreciated!
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Old 11-28-2007, 04:10 AM   #2
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Bump.

Any ideas here? Why would the ECC be flashing for a minute or two shortly after startup?
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Old 11-28-2007, 09:31 AM   #3
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Any number of faults can do that. It'* pretty hard to take a good guess.

I'd suggest since things work right, that it'* possibly some non-critical component. Does your outside temp seem to report the right temp? It'* also possible the inside temp sender may be bad. You'd have to check that with an ohm meter.
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Old 11-28-2007, 04:05 PM   #4
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Outside air temp seems to be accurate. This all began when I had battery problems a few months ago. But all I ended up doing was replacing the battery. Not sure if the two things are related or not.
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Old 11-28-2007, 05:10 PM   #5
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What about the amount of R134 in the system? My ECC flashes because of no refrigerant...;I gots me a leak at the compressor. That'* another one of my winter projects...rebuilding the compressor
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Old 11-28-2007, 05:59 PM   #6
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Quote:
Originally Posted by big_news_1
Bump.

Any ideas here? Why would the ECC be flashing for a minute or two shortly after startup?
Mine had flashed when the car was cold and started up or when it hit the cold air a minute after coming out of the nice garage. I added R134A this summer and it hasn't flashed since. I suspect when the AC system is cold the R134 pressure dropped below the needed pressure for the minimum switch and triggered the flashing. That'* even though the system was requesting AC, is was still tell me there wasn't enough freon at 20 deg. F.
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Old 11-29-2007, 02:13 AM   #7
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I guess I can take a look, although I had a new condenser installed in the last year because the old one leaked. Plus the A/C worked fine all summer. I don't know why it would act up all the sudden. But it'* worth a shot.

Any way to scan the ECC to see what the problem is? Or is that a dealer thing?
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Old 12-02-2007, 02:51 AM   #8
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I realized something tonight since the weather'* finally starting to turn a little colder. There'* no heat coming out of any of the cabin vents. The air it blows isn't freezing cold, but it'* much cooler than it should be blowing in 50 degree weather.

Would this be an airmix door malfunction?
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Old 12-02-2007, 11:57 AM   #9
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Starting to look like it. Remember my redneck fix topic? It shows a view in through a hole in the dash support bar. Remove the glovebox door and liner. Get a flashlight and look in there.

Now adjust your heat full cold and full hot. Do you see the actuator move? Does it ever try to 'home' itself on startup?
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Old 12-17-2007, 02:15 AM   #10
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Time for a revisit to this topic....


The car DOES have heat... just not all the time. Sometimes the air blowing out of the floor/panel/defrost is nice and warm; other times it starts blowing before the engine warms up and remains cool for the duration of the drive (usually I just turn off the ECC when this happens). I haven't noticed any pattern to when the air blows cool or when it sends warm air through the vents.

Any ideas? Probably not an airmix door? Any chance its the sensor that reads the cabin air temperature reporting a faulty reading?
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