96 Bon. no heat

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  #1  
Old 02-03-07, 12:20 PM
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96 Bon. no heat

I have a 96 Bonniville and I lost my heat. I changed the thermostat, and that didn't help what could be another problem?? The heat will come on for a minute, and then shut off, then like 20 minutes later another blast of heat will come and then just continue to blowing cold again.
 
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Old 02-03-07, 12:27 PM
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First, did you check the coolant level in the radiator. Remove the cap when the engine is cool, and check. Second, there should be a small nut on top of the thermostat housing. It is an air bleed valve. Did you bleed it after replacing the thermostat?
 
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Old 02-03-07, 12:30 PM
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no i did not bleed the thermostate, I saw the screw though. How do i bleed it. Also I think I am having some fluid level issues. I flilled the overflow two days ago and it is empty again. I don't have fluid dripping where could it be going???
 
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Old 02-03-07, 03:09 PM
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I can almost guarentee it's the air blend door actuator. I just fixed my Stratus that had this problem. It would be producing good heat, then just go to cold.
 
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Old 02-03-07, 07:10 PM
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Couple of things come to mind...........Does it have a plastic intake manifold????? May be leaking coolant into the cyls........or into the oil White smoke from exhaust???? Strange concoction under oil cap????.....Also check the intake gaskets. Although this is probably a Buick V6 It may still be leaking from the intake gskts..........
 
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Old 02-04-07, 07:31 AM
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You have to get the air out and enough antifreeze in; bleeding air out is needed somehow (I'm not familiar with this process; try Autozone or someone here likely knows how; or do general google search for topic). Without enough fluid, you can't get flow through heater core etc...
 
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Old 02-04-07, 07:36 AM
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I still think it's the blend door if it gets cold suddenly, but, feel your two heater core hoses going into the firewall, if they are both hot (when air is cold), that means your blend door is broke.
 
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