99 Lesabre heater temp display blinking - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 06-01-2016, 09:44 PM   #1
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Default 99 Lesabre heater temp display blinking

Got a 99 Lesabre with ECC. Start the vehicle and the temp display on the control head blinks for a few minutes then stays on steady. Did notice that no air comes out the dash vents, will come out the defrost when set to dash vents.
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Old 06-01-2016, 10:12 PM   #2
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The blinking ECC display typically indicates that an issue has been detected by the ECC, and a code set.

A brief google discovered this thread on another board:
Automatic Climate Control - blink codes
Quote:
I think you can for the 98...this is from the 99 service manual:

1. Press & hold the OFF, AUTO, and RECIRC buttons for 1 second.

2. the DTC'* will display for 2 seconds each and then return to normal operation.

There are 24 DTC'* listed in the manual ; 18 start with B; 6 start with U.
This may be worth a crack to try and get some answers. Have you noticed any other issues with the climate controls?

Also, when you attempt this, make sure you are able to record the codes when you do it, as it was suggested that doing this causes the ECC to dump the stored codes.

Last edited by rjolly87; 06-01-2016 at 10:15 PM.
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Old 06-02-2016, 12:22 PM   #3
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Further to what rjolly posted, when the HVAC control head detects an error it will go into default mode, which is air coming out the defrost only. The blinking light and air coming out the defrost only tells me the HVAC control head likely needs to be replaced. You can usually find them on Ebay for not a lot of money, and they are relatively easy to change.
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Old 06-02-2016, 01:17 PM   #4
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I tried getting a code out by pressing and holding the off, auto and recirc buttons but I don't get anything.
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Old 06-02-2016, 03:21 PM   #5
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Sure would be nice to have another panel to try in there. Check electrical connections.
Otherwise a TechII scanner or Snap On Ultra, can read the fault codes, in the hands of a familiar tech.
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Old 06-02-2016, 11:16 PM   #6
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More likely, a leaking vac tank, disconnected vac line, or bad electronic vac valve box.....lose any of these and the system defaults to the defrost mode....
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