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PostPosted: Thu Feb 02, 2012 2:26 pm 
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Name: Erik
So i just brought my 02 grand prix. After two months i had to get my switch to my heat fix. Then i lost my heat... So i got a new water pump and t-stat. Still does not work. i got my lower intake fix and my car still over heats and does not blow out hot air... any ideas???


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PostPosted: Thu Feb 02, 2012 4:49 pm 
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04 u must mean right ?? lol jk, hmmmm i dunno lol low coolant ?? coolant leak?

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PostPosted: Thu Feb 02, 2012 4:51 pm 
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Did you bleed the coolant system of air fully?

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PostPosted: Thu Feb 02, 2012 10:15 pm 
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Name: Erik
I'm pretty sure i did.
But this is my first grand prix so i'm not to sure if i did bleed it right.


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PostPosted: Thu Feb 02, 2012 10:23 pm 
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What do the coolant fluid levels look like in the radiator and in the overflow bottle? Either or both low at all?

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PostPosted: Thu Feb 02, 2012 11:10 pm 
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Name: Erik
I top them both off everyday because i always seem to run low. And i just fixed my lower intake witch was my big leak.
So far i see no other leaks.


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PostPosted: Sat Feb 04, 2012 9:06 am 
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I top them both off everyday because i always seem to run low.


Yikes! Every day?? Yeah, that's the reason for your loss of heat - your heater core is going dry (or at least low). If you are adding every day (or even every few days) you're either 1) burning the coolant (which would show thick(er) white exhaust), 2) leaking onto the ground (which may be a slower leak and difficult to identify - but if you're adding every day then it'll be a faster leak) by means of a water pump seal, cracked radiator, overflow bottle or another seal / gasket location) or 3) you're leaking the coolant internal to the engine (getting into the oil, lower intake - but you said that was repaired - upper intake, or some other small crevice - maybe a leak at the throttle body??) If the coolant were leaking at the seal between the UI and the TB then odds are you'd either see or smell it when it hits the hot exhaust crossover pipe.

Another point is if the car was originally overheating and then now it's suddenly putting out zero cabin heat, another cause MIGHT (I'm somewhat grabbing a straws on this idea) be a head gasket. One popular symptom when they go is that you start burning coolant (thick white exhaust), temp gauge will climb into the "red" zone until the t-stat opens and then in a matter of a couple of seconds, the temp needle will go back to a lower or otherwise normal position on the gauge but with head gaskets the needle will, over the course of driving for a little while (not just two-mile-at-a-time trips), climb into the red / higher zone and drop back down multiple times (t-stat closes and the engine start to slowly overheat again until the t-stat re-opens).

Given the above, what I can say for sure is that if you have no cabin heat and are adding coolant on some type of reoccurring basis (on really any interval between oil changes), then somewhere there's a leak. So long as you keep on top of making sure the radiator (at least) is always topped and you're 100% sure your leaking the coolant outside of the engine (and not into the oil, for example) then you can drive the car without TOO big of a repercussion but I would not recommend it in the least (unless you need to drive the car to a shop to have it looked at).

Not too long ago my brother was driving a '01 GP three hours home from a long road trip and before he left he realized he had a coolant leak but given the day and time he was leaving and the fact he was a ways from home, he couldn't have the car looked at and had to drive it home so I told him to grab a couple of bottles of coolant and watch the temp gauge like a hawk and every half hour or so stop and make sure the overflow bottle was full and to, before he even left, intentionally fill the overflow bottle most of the way full; he was able to make the three hours home with only having to stop a couple of times to refill the overflow bottle and after the car was looked at it turned out the UI was, in part, leaking (there was something else I think but I can't recall exactly right now).

Anyway, I hope I didn't freak you out too much with what I said above and I also hope that something I said can be useful.

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PostPosted: Tue Feb 14, 2012 4:17 pm 
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When I had this problem is time for a new radiator. Check your radiator for leaks, but the post above me pretty much nailed it.

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PostPosted: Tue Feb 14, 2012 7:27 pm 
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maybe a clogged radiator too..

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