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


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Old 12-07-2015, 01:08 PM   #1
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Default Heater doesn't heat well - 2007 Buick Lucerne 3800

Hi

Today was cold outside , I turn on the air Conditioning on HOT temperature (31.5C).
the car was in operation temperature and the heater not heat well at all.
driver'* side was a little bit warm air and the passenger side was cold .

what could be the problem ?
I already know there are several options : thermostat , dirty heater core , blend door ..
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Old 12-07-2015, 06:29 PM   #2
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Make sure the radiator and overflow tank are filled to the proper level. If it hasn't been changed in a while, put in a new thermostat. Those are both inexpensive and easy fixes, and a high probability of fixing your issue.


Does your car have a temperature gage? What does it read?
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Old 12-08-2015, 12:33 AM   #3
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I checked the overflow and it'* OK .
maybe the different between the driver and passenger temperature lead to the solution ?
why one side cold and other warm ? even that the warm side should be warmer ...
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Old 12-09-2015, 05:00 AM   #4
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there is any option that the problem in the thermostat if the temperature gauge look fine and operation well ?
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Old 12-09-2015, 03:27 PM   #5
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If you have checked the coolant levels, when the engine is cold(reservoir and radiator),and the levels are ok, then get engine to normal operating temp.....now command full hot.......with a thermometer in the register(check both sides), it should read 145-165F.......

If it doesn't then feel both heater core hoses....if both are hot, temp door problem......if the inlet is much hotter than the outlet(should approx be the same...hot), either air bound, or partially plugged(do a reverse flush)....

Is a code P0128 set?
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Old 12-10-2015, 02:05 AM   #6
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I don't see a service light , and i didn't cheaked with OBD the car .
Today I gonna follow your steps and I write later what I found . Thanks
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Old 12-10-2015, 12:19 PM   #7
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Last hour I cheaked the temperature in each vents :
Driver side - 92 F
Passenger - 80.4 F

Any ideas ?
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Old 12-10-2015, 02:55 PM   #8
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Now I cheak the 2 hoses on the fire wall , Heater core hoses .
The are different between them of 68 F .

It'* normal ?
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Old 12-10-2015, 11:24 PM   #9
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Did you check the coolant level in radiator and reservoir on a cold engine?

Did you check the temp from the vents, with the engine fully warmed, and on max heat?

Just feel the heater core hoses....they should BOTH feel as hot as the radiator hoses....if one is much cooler, it is air bound(due to a leak), or a partially plugged heater core....
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Old 12-11-2015, 12:56 AM   #10
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Quote:
Originally Posted by Tech II View Post
Did you check the coolant level in radiator and reservoir on a cold engine? YES

Did you check the temp from the vents, with the engine fully warmed, and on max heat? YES

Just feel the heater core hoses....they should BOTH feel as hot as the radiator hoses....if one is much cooler, it is air bound(due to a leak), or a partially plugged heater core....
What are you mean when you say "much cooler" ? I saw a different of 68 F ... both of them hot but the inlet more .
why in the passanger side i don't feel any heat ? only from the driver side .


Thanks
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