Problems with HVAC and cold air in the winter - Page 5 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 12-18-2013, 02:54 PM   #41
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I'm thinking a new thermostat is in your future.
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Old 12-18-2013, 03:19 PM   #42
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alrighty then. Ill replace that to see what happens. When I take the old one out I will look to see if it is indeed stuck open, if it is even possible to tell.
Thanks!
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Old 12-18-2013, 03:40 PM   #43
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alrighty then. Ill replace that to see what happens. When I take the old one out I will look to see if it is indeed stuck open, if it is even possible to tell.
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If your car is warm and toasty with the new thermostat you will know the old one was the problem.
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Old 12-18-2013, 03:41 PM   #44
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If your car is warm and toasty with the new thermostat you will know the old one was the problem.
This is true. But what if it isn't? What else could be the culprit?
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Old 12-18-2013, 05:05 PM   #45
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Nothing.

If it was a broken blend door, the engine would be coming up to full operating temperature and it would be cold in the car.

If it was air in the system, you would get heat on an inconsistent basis. It would come and go.

The combination of the engine not coming up to operating temperature and the HVAC not putting out a lot of heat points to a failed thermostat.

Even if I am wrong and it is something else, changing the thermostat is the logical first step in addressing the problem. Particularly when you consider the low cost and how easy it is to change. When I change a thermostat I don't even drain coolant. Just put a pan on the floor under the thermostat housing to catch the coolant that comes out, remove the rad hose from the housing, undo two bolts, remove the old, clean the gasket surface, and re-install. Even if there is a gasket or a rubber seal, I always put some permatex between the thermostat housing and where it seats. Make sure you don't overtorque the housing bolts or you will crack the housing.
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Old 12-19-2013, 10:08 AM   #46
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new thermostat is installed. I will now wait to see how it performs when I have to drive somewhere. I will post here what the car does with the new thermostat after a drive to test it!
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Old 12-19-2013, 11:25 AM   #47
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new thermostat is installed. I will now wait to see how it performs when I have to drive somewhere. I will post here what the car does with the new thermostat after a drive to test it!
Make sure you bleed all the air out of the cooling system.
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Old 12-19-2013, 11:44 AM   #48
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Make sure you bleed all the air out of the cooling system.
yep, already did.
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Old 12-19-2013, 12:47 PM   #49
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It'* been an hour. What'* taking so long??
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Old 12-19-2013, 01:12 PM   #50
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He'* probably out enjoying how warm his car is.
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