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

Cost to replace HVAC module

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Old Oct 5, 2018 | 07:40 PM
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Default Cost to replace HVAC module

The HVAC module on my ‘96 has been giving me problems for several years, but I was always able to get it to respond after pushing the buttons enough times, but no more. I can no longer get it to turn off, switch to auto, etc. So my question is, does anyone have a ballpark figure on what it might cost to have the unit replaced by a mechanic? I’m thinking of selling the car anyway, so I’ll need to decide if the cost of replacing the module is worth it. Any input would be appreciated.
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Old Oct 5, 2018 | 09:25 PM
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I replaced the dash control module in my '88 and it's a pretty simple job.
I suspect shop rate would around 1hr, plus cost of a new unit.
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Old Oct 5, 2018 | 09:52 PM
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Originally Posted by 65Z01
I replaced the dash control module in my '88 and it's a pretty simple job.
I suspect shop rate would around 1hr, plus cost of a new unit.
It was a simple job? I haven’t checked, but did it require taking the dash apart? How long did it take you?
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Old Oct 5, 2018 | 10:17 PM
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Originally Posted by dlt4

It was a simple job? I haven’t checked, but did it require taking the dash apart? How long did it take you?
I think it involved taking the shifter pieces of plastic out and the facia. Not too bad.
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Old Oct 6, 2018 | 08:23 PM
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It's fairly easy to pull the HVAC module


I cleaned the connectors, reassembled it, and then all the controls worked well.
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Old Oct 6, 2018 | 10:20 PM
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On my '88 there are three dash pieces that need "moved", including the one covering the HVAC controller; then 4 screws and the electronic connection to remove the unit. I'd estimate it took 1/2-1hr.
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Old Oct 7, 2018 | 08:14 AM
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Originally Posted by ghlkal
It's fairly easy to pull the HVAC module

https://www.youtube.com/watch?v=KBeqA1n9q9A

I cleaned the connectors, reassembled it, and then all the controls worked well.
Hmmm, hadn’t thought about just cleaning the connectors, I was just assuming the electronics were hosed. What exactly did you do to clean them? Thanks for that suggestion and the video.
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Old Oct 7, 2018 | 08:16 AM
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Originally Posted by 65Z01
On my '88 there are three dash pieces that need "moved", including the one covering the HVAC controller; then 4 screws and the electronic connection to remove the unit. I'd estimate it took 1/2-1hr.
Thanks for the info. I had it pictured as a much larger job.
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Old Oct 7, 2018 | 11:14 AM
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Originally Posted by dlt4


Hmmm, hadn’t thought about just cleaning the connectors, I was just assuming the electronics were hosed. What exactly did you do to clean them? Thanks for that suggestion and the video.

+2, I used the same procedure on my 96 control head and everything works great....for a year now.
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Old Oct 7, 2018 | 11:27 AM
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Does it change over the years or will any other unit from a C4 that looks similar fit?
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Old Oct 7, 2018 | 12:58 PM
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Originally Posted by aklim
Does it change over the years or will any other unit from a C4 that looks similar fit?
On the "later years" the units are the same but the type face and color changed. If memory serves, the 90-92 are orange type and the 93-96 are white. The mechanics are the same.
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Old Oct 7, 2018 | 04:06 PM
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Originally Posted by billschroeder5842
On the "later years" the units are the same but the type face and color changed. If memory serves, the 90-92 are orange type and the 93-96 are white. The mechanics are the same.
I'd see if you can borrow one from somebody who has one to test.
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