Heater core prob. and Overheating - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 01-09-2008, 02:45 PM   #1
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Default Heater core prob. and Overheating

I've searched for an answer and I came up with that it probably the heater core. I'm not too sure of this, I don't even know where it is...When I'm at a stop light the fumes seep through the vents and when I start driving it starts to blow through the vents, but not that much. Does anyone have some knowledge on what this maybe?
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Old 01-09-2008, 03:10 PM   #2
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its most definitely the heater core, is you carpet wet anywhere around the dash?

the heater core is located behind the dash
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Old 01-09-2008, 03:45 PM   #3
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I didn't check for wetness, I will when I return to the car. Do you have to remove the dash in order to fix this problem?
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Old 01-09-2008, 03:47 PM   #4
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Quote:
Originally Posted by trigga_b
I didn't check for wetness, I will when I return to the car. Do you have to remove the dash in order to fix this problem?
yes, im pretty sure you do.
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Old 01-09-2008, 05:23 PM   #5
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I assume it'* on the 92 Bonneville? You have three cars in your signature.

It could be fumes from under the hood where you have antifreeze dripping onto something hot and the fumes come in through the air intakes.

If it'* a heater core, you'd get a lot of moisture on your windshield when you start the car and the windows are cold. As the heater warms the higher humidity will really cloud the windows at first.

Always assume the easiest problem solution. Look for a hose dripping, the plastic connector into the end of the intake manifold. That is plastic in the original and eventually cracks and leaks and then blows out. Mine did on a 93 leSabre.

In newer Bonnevilles/leSabres the heater core can be replaced from under the dash. I don't believe the dash has to be completely removed. I'm not sure on the earliest 92 models.
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Old 01-09-2008, 05:48 PM   #6
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Yeah its for the 92' bonnie and no there is no water or moisture on the carpet. I have 2 lines at the beginning of the raidiator and close to the trans that are moist, but not wet. I'm sure thats not causing it to smoke through the vents. I just notice that there'* a broke bolt on my intake manifold where the throttle body meets (close) one to the firewall, but I don't see any leakage, nor feel a decrease in performance. My coolant level is still the same too.

EDIT: My front windshield stays fogged also.

P.*. If this is a tough job to tackle for me then I'm might just sell it or part it out. And work on getting me a SSEI
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Old 01-17-2008, 01:42 PM   #7
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dude it is simple to swap the HC'* in these cars

it only took me an hour and half total to do it

it is by no means a reason to part out a car over

damn

i JUST did one in a 94 Bonneville for a friend


no you do not have to pull the dash

omg....

the glovebox and door yes

but thats it

other than the underdash panel

big deal..


heres what i did:
take soemthing long and bust off the heater core fittings under the hood next to the strut tower

remove the glovebox and door

remove the underdash panel

rmeove the heater control thingy screwed to the heater box under there and un-clip the heat door rod

pull the carpeting back from below and under the heater box

remove the heater core cover piece

the heater core is right there

its not hard one bit

pull the broken off heater core fittings out of the heater hoses

use hose clamps and socket and extension to re-clamp the hoses

the hardest part is the lack of much room to work with the heater core hose ends

about an hour and a half and youll be done

do it in steps if youre scared or something

its very straightforward

try doing a 99 breeeze heater core, or a volvo one

they are WAY more involved,

in the breeze you have to pull the fornt seats, entire console asembly and parking brake asesembly and shifter and entire dah has to be stripped and so on

i did it in about 6.5 hours altogether


book calls for 8 or so


you cant be a-feared

they are easy if you just stop and look and pull screws and bolts



good luck
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Old 01-17-2008, 02:56 PM   #8
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well if you own a pontiac 6000 dont touch that heater core
i replaced mine and it sucked it took 4 days
i had to remove the whole dash
100+ screws later the dash came out and i took off the heater cover
i got a face full of antifreeze
i also had to remove the alternator too
i hope for your luck its alot easier
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Old 01-17-2008, 03:19 PM   #9
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Quote:
Originally Posted by fast68
dude it is simple to swap the HC'* in these cars

good luck
Is this similar to the layout for a 92? It think these are someone'* pics of a later 90s model:
Note, you do NOT have to remove the dash. This is a great view of what you'll work on from under the dash and through the glove box opening.



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Old 01-18-2008, 11:33 AM   #10
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Dam imidazol, you just brought faith back to my bonneville. Thanks for the pics. I never got around to looking for it because it'* cold as hell out here, so I just parked and was going to sell it for $800. The first day I told someone they was thirsty to buy it, but I didn't want to sell it right away.
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