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1998 pontiac sunfire, overheating and no hot air from blowers
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MynamesMike
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Dec 12, 2009, 2:50 PM
Post #1 of 6
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1998 pontiac sunfire, overheating and no hot air from blowers
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1998 pontiac sunfire, 2.2
The engine overheats really fast and no warm air will come in from the blowers. This all started when I noticed my coolant leaking, it was coming from the water pump so i replaced the pump, it stopped the leaking but a new problem sprouted. I couldn't get any hot air when I turned my blowers on, and the engine would overheat quickly. I replaced the thermostat, twice in case of a faulty one, and still, no hot air, and engine still overheating. We've tried bleeding the lines but still can't get any heat, and the engine is still overheating..
Any suggestions?
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Hammer Time
Ultimate Carjunky
/ Moderator
Dec 12, 2009, 3:41 PM
Post #2 of 6
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Re: 1998 pontiac sunfire, overheating and no hot air from blowers
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One of two things is happening here. Either you never got all the air bled out of it or the previous overheating has caused a blown head gasket. Vacuum fill is the best way to make sure all the air is out of the system. There is no question that air is the reason for no heat. the question is whether you just never got it all out or it's getting combustion into the cooling system.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Sidom
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/ Moderator
Dec 12, 2009, 6:53 PM
Post #3 of 6
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Re: 1998 pontiac sunfire, overheating and no hot air from blowers
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HT is right on this one..... Using an air lift tool is the only way to go. One thing I use to do when I was sure I had an air pocket was to run the engine and let it get hot (not pegging the gauge but at least over 3/4) and then turn it off & let it sit (don't touch anything), after it had cooled down I would remove the cap and fill the rad the rest of the way. The ones with the remote reservoirs are real bad for getting all the air out even the bleeder screw doesn't work that well. If you don't use an air lift you are almost guaranteed to get an air pocket.....
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MynamesMike
User
Dec 12, 2009, 9:38 PM
Post #4 of 6
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Re: 1998 pontiac sunfire, overheating and no hot air from blowers
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I've been bleeding it for a while now, using this process : let the car run for about a minute, shut it off, bleed the air out, repeat, but each time I bleed, air comes out. I've bled it over and over and over, and each time air comes out, it almost seems as if air is getting in somehow still, because no matter how much i bleed air still keeps coming out with the fluid.
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Tom Greenleaf
Ultimate Carjunky
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Dec 12, 2009, 11:14 PM
Post #5 of 6
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Re: 1998 pontiac sunfire, overheating and no hot air from blowers
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Ditto - Hammer is right on and with what you just said that air is like a blown head gasket letting exhaust into cooling system. You may notice it pressures up too quickly (careful it still could get very hot) by just squeezing upper hose after radiator cap has been off it should take a while to regain pressure or test recovery tank for exhaust gasses.
Exhaust gas would behave like air and if system isn't just coolant and free of "air" heater wouldn't work well or at all.
Sorry for bad news. Verify the pressure thing or exhaust test as you don't want to be wrong - head if this is true should be sent out to machine shop for inspection and to verify it's ok or they would fix it. Some engines cross coolant all thru intake manifold - sorry I don't know every one without a good look,
T
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Sidom
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Dec 13, 2009, 10:43 AM
Post #6 of 6
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Re: 1998 pontiac sunfire, overheating and no hot air from blowers
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Well Mike you can try that process if you like but if you do have a big air pocket in it, you way is gonna take a few days. I'm going off what you posted about no previous problems other than a leaky water pump.
The 1st clue would be how much anti-freeze you put back in. If it was around 1/2 a gallon, then you have a big air pocket that needs to be removed. I've already posted the only way that has worked for me on those systems if I didn't vacuum fill it so I'm not gonna repeat myself. I believe those are bottom mounted T stats, I seen guys take off the upper hose & fill the block with some success.
I know those have high mount bleeder screws on those systems but they plain don't work for these type of air pockets, never have. My way takes about 1hr. Removing the upper hose way takes about 1/2 hr. (I was never successful with that method) The bleeder screw method with a pocket that big would seriously probably take days (I've never had the time to find out for sure). Using an airlift tool on those systems is the only way to go...
So the big question would be..... How much anti-freeze/water did you originally put back in? If it was over a gallon & 1/2 then you do need to be looking at the head gasket, maybe a defective pump, I've had a few new bosch pumps with loose impellers. But from what you've posted, it really sounds like an air pocket, I've seen this a hundred times on these systems.....
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