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

Heater Core accessible from engine side?

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Old Mar 4, 2023 | 03:56 PM
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Default Heater Core accessible from engine side?

Anybody tried this route? My original 1985 core finally went out after some non-use. I know the entire car was built around it but currently I have no AC or heater lines in the way so…

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Old Mar 4, 2023 | 10:16 PM
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I replaced my ac evaporator and heater at the same time. I don’t think you can get the heater core straps loose from outside. The bolts are on the inside.

I know everyone says what a miserable job the heater core is. I am in the minority here but it is not bad. It will take some time but not bad at all. I feel removing the top part dash makes it much easier.
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Old Jul 26, 2025 | 11:22 PM
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I'm going to have to do this job also as mine was already bypassed. Unfortunately from the look of it my job will be a bit harder due to aftermarket stereo wiring... I'll have to look up fastguy method!
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Old Jul 27, 2025 | 04:37 PM
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Originally Posted by PatrickBowersJr
I replaced my ac evaporator and heater at the same time. I don’t think you can get the heater core straps loose from outside. The bolts are on the inside.

I know everyone says what a miserable job the heater core is. I am in the minority here but it is not bad. It will take some time but not bad at all. I feel removing the top part dash makes it much easier.
I agree, not that difficult, just time consuming. You just have to learn to see with your fingers to find that one screw on the top...
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Old Jul 27, 2025 | 08:47 PM
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Has anyone done both an 84-89 and a 90-96 heater core? I know that for either group I'd remove the Instrument Panel (IP) pad. I know that the 84-89 IP pad is less fussy and quicker to remove than the 90-96 by quite a bit. I haven't done either heater core. For those that have, which group is 'easier'?
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