C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Heater core replacement - any hints?

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Old Jun 25, 2019 | 06:26 AM
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Default Heater core replacement - any hints?

Hi to all

I am going to replace my old heater core in my C4 1995, LT1. I have read here some catastrophic posts about this job.

I have bought service manual and it seems to be not easy, but possible. I have time (5 days), courage and I am determined. Do you have any useful hints or tips how to do the job smoothly as possible?

Thanks in advance J.

Last edited by juni78; Jun 25, 2019 at 06:28 AM.
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Old Jun 25, 2019 | 07:32 AM
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Take out the seat... I did mine when I was 17 and it took a few hours. 84s are probably less cluttered under there though. I left the top 2 bolts out of the cover... it sealed up just fine but those sucked to get to.
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Old Jun 25, 2019 | 08:02 AM
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I did mine a couple years ago. It wasn't too bad, but time consuming. take pictures as you move along and bag the screws. Don't rush it, take your time. Here's a pic of the parts pile.



Gary
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Old Jun 26, 2019 | 01:19 AM
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Do you have to disable the PS air-bag?
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Old Jun 26, 2019 | 04:43 AM
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Originally Posted by 65Z01
Do you have to disable the PS air-bag?
That is was the factory manual instructs you do, and since your face is going to be only inches away from the passenger airbag at various points, yeah, you really should disable the SRS.
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Old Jun 26, 2019 | 12:03 PM
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Originally Posted by Antarctico
That is was the factory manual instructs you do, and since your face is going to be only inches away from the passenger airbag at various points, yeah, you really should disable the SRS.
Sure! On other hand, without that it could be another way for quick fix of the core and all my problems here on earth

Last edited by juni78; Jun 26, 2019 at 12:04 PM.
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Old Jul 3, 2019 | 07:10 PM
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Default Job done




The little beast is out of the cage. Thanks for the advices, all of them were useful. The job took around 8 hours. It wasnt so bad, however crucial was to progress slowly and make pictures and notices about all parts, wires and bolts. Without that I wouldnt be able to put it back together.
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Old Jul 4, 2019 | 09:55 AM
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Originally Posted by 84 4+3
Take out the seat... I did mine when I was 17 and it took a few hours. 84s are probably less cluttered under there though. I left the top 2 bolts out of the cover... it sealed up just fine but those sucked to get to.
On the earlier cars where you can go in from underneath you probably want to remove the seat. When doing my 92 which is the same as the 1995 except for the airbag. I sat on the seat for a good part of the time I was doing mine.

As already said, it's not hard it's just monotonous. The FSM will get you through it. But it will run you all over the place.Here are the steps consolidated into one place, but since they are based on a 92 the Air Bag is not included.
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Old Jul 4, 2019 | 12:01 PM
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Originally Posted by juni78
Don't pass up this opportunity to replace the rotted foam around the vents and the rotted anti-noise foam tape on the A/C duct work. I did all this in my vette, along with plastic welding all the broken dash pad mounting tabs, and I couldn't be happier with the results. My car is buzz, squeak, and rattle free.
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Old Feb 24, 2020 | 09:38 AM
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Originally Posted by Antarctico
Don't pass up this opportunity to replace the rotted foam around the vents and the rotted anti-noise foam tape on the A/C duct work. I did all this in my vette, along with plastic welding all the broken dash pad mounting tabs, and I couldn't be happier with the results. My car is buzz, squeak, and rattle free.
One you are here with the upper pad removed, the passenger vents are showing, where is the heater core in relation to this last picture...do you remove those vents...
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