Heater doesn't heat well - 2007 Buick Lucerne 3800 - Page 3 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 12-14-2015, 01:41 AM   #21
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Thank you WilliamE . maybe I start with this calibration . where the HVAC fuse located ? in the black box in the left side ?
if it'* not work , how I get to the special menu in the control head ? I need a scanner for that ?
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Old 12-14-2015, 03:05 AM   #22
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Very welcome, I believe that is where it is located, there should be something on the cover showing which fuse is which, if not you will need a manual to find it.
Wait, I found a diagram that says it is for your car.
The only fuse listed that could be it is fuse #10, it says climate control system, now I am not an HVAC Tech, but I am pretty sure that is the one that controls the HVAC, it is obviously none of the others.
The diagram is hard to see since it is so tiny, but #10 looks to be two to the right from the top left, and then down one.

#? 2007 Buick Lucerne Under Hood Fuse Box Diagram ? Circuit Wiring Diagrams


I tried to find something that explains the procedure a bit better, but all I could find is this, it says it is for trucks and SUV'*...
Maybe somebody more familiar with HVAC'* could find better info.
HVAC Actuator Recalibration Procedure For GM Trucks and SUVs
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Old 12-14-2015, 03:51 AM   #23
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Wow thank you !
Today I will try it .
This proccess sound sense cause I saw it in another web ... I don't remember where .
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Old 12-14-2015, 10:51 PM   #24
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I think there is still air in the system....
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Old 12-15-2015, 12:18 AM   #25
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It sure would not hurt to warm it up a little and pop the bleeder screw again to be sure.
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Old 12-15-2015, 01:03 AM   #26
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TechII , maybe you right I'll try it too .
How can I know that no air left inside ? last time , I refill coolant and start the engine . I open the bleeder screw until I saw and coolant spilled constantly . I touched all the hoses to feel if there hot and they was ..
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Old 12-15-2015, 05:25 AM   #27
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When you see a steady stream of coolant that usually means you got all of the air out, sometimes it is good to do this, drive it a while, then do it again to be sure.
After doing so always be sure to top off the radiator, and be sure you have the right amount of coolant in your coolant res, that way it won't pull air into the system if it ever gets too hot, or runs low on coolant..
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Old 12-16-2015, 12:36 AM   #28
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Hi
Now I tried to do the calibration of the blends door .
That what I did :
Turn on the car , without start the engine .
Set the HAVC on "AUTO"
Turn OFF the car and remove the HAVC fuse (in the photo - F14) a few minutes .
Return the fuse in and start the engine - nothing happen , the temperature not change to default .
Turn off the car 10-15 seconds and start again .

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Old 12-16-2015, 01:58 AM   #29
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It is possible some vehicles cannot be re-homed that way, it was worth a shot, sorry it did not work.
I am guessing you need to have a Tech II scan tool in order to command the re-homing.

Have you tried cracking the bleeder screw again to see if any air is still remaining in the system?
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Old 12-16-2015, 02:44 AM   #30
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Not yet .
Today I'll cheak it

Thanks
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