99 Lesabre heater temp display blinking
#1
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.
#2
Senior Member
True Car Nut
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
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.
A brief google discovered this thread on another board:
Automatic Climate Control - blink codes
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.
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.
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 09:15 PM.
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CathedralCub (06-02-2016)
#3
Senior Member
True Car Nut
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.
#5
Senior Member
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.
Otherwise a TechII scanner or Snap On Ultra, can read the fault codes, in the hands of a familiar tech.
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