96 SE blowin cold air only - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 11-26-2008, 02:41 PM   #1
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Default 96 SE blowin cold air only

i just got this 1996 bonneville with 118,000 miles on it and for some reason every now and then the heat turns to cold air and it wont blow hot air out even when its warmed up. woundnt that be a heater core problem??????
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Old 11-26-2008, 03:05 PM   #2
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now i just turned it back on after 20 min and its blowing hot air again, does anyone have any suggestions???
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Old 11-28-2008, 11:09 AM   #3
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sounds like air in the heater core
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Old 11-28-2008, 11:11 AM   #4
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This is a bit outside my area, but I seem to remember there being a valve under the dash, near the glove box I think. And that controls how much hot or cold air enters the car. I could be way off on this, I'm just not sure. But it'* worth a look. I've never had this problem myself so I never looked that close.
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Old 11-28-2008, 06:55 PM   #5
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my 95 was doing the same thing, i topped it off and burped it then topped it off again and it has been fine ever since.
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Old 11-28-2008, 11:51 PM   #6
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Check the coolant level in the radiator, not in the reservoir tank. If you have an air bubble in the radiator, the heater core has air in it and you'll get erratic heat/coolant flow in it.

If the radiator is full, when the car is fulled warmed up meaning the lower radiator hose has warm water circulating, run the motor at 2500 for 10 seconds and then repeat that 4 more times. That shoud get the air out of the heater according to the service manual. Then bleed the air at the thermostat housing using the little screw on top.
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Old 12-01-2008, 10:15 AM   #7
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I have a 1999 SE with now 117,400 miles and it seems to only blow mildly warm air. I just changed the UIM and LIM gaskets and refilled the radiator and bled the lines. I will try cycling the motor to 2500 RPM and then bleed the line again.

But would air in the system also cause the temp gauge on the dash to cycle between 195 and 160 degrees constantly while driving 30+ miles?? Could this be a bad thermostat? I already replaced the thermostat once when it was stuck open right after I bought the car 2 months ago.
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Old 12-01-2008, 11:46 AM   #8
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Sounds to me lik eyou have a 180* thermostat with the PCM still programed for a 195*
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Old 12-01-2008, 12:29 PM   #9
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Hmmm the guy at NAPA could have grabbed the wrong one off the shelf...

I knew I should have just bought another new t-stat to install when it was tore apart.

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Old 12-01-2008, 06:09 PM   #10
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thanks guys for all the info i will try these steps and hope for the best.
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