module on HVAC box behind dash id
Thread Starter
Joined: Aug 2009
Posts: 454
Likes: 26
From: London, UK
Car: 1991 Trans Am
Engine: L31, LT4 hot cam
Transmission: T5
Axle/Gears: 3:42 LSD
module on HVAC box behind dash id
should’ve taken pictures but now dash is back on
Noticed a module to the right of the hvac unit (hanging off the hvac unit) with a chip connector but nothing to plug into it. Black box with looked official GM rather than aftermarket. Any ideas what this might be?
tried searching and might be a cruise control piece? But seems an odd and no connector but my cruise worked fine?
car is a 91 TA 5speed
Any steers would be great
Noticed a module to the right of the hvac unit (hanging off the hvac unit) with a chip connector but nothing to plug into it. Black box with looked official GM rather than aftermarket. Any ideas what this might be?
tried searching and might be a cruise control piece? But seems an odd and no connector but my cruise worked fine?
car is a 91 TA 5speed
Any steers would be great
Re: module on HVAC box behind dash id
should’ve taken pictures but now dash is back on
Noticed a module to the right of the hvac unit (hanging off the hvac unit) with a chip connector but nothing to plug into it. Black box with looked official GM rather than aftermarket. Any ideas what this might be?
tried searching and might be a cruise control piece? But seems an odd and no connector but my cruise worked fine?
car is a 91 TA 5speed
Any steers would be great
Noticed a module to the right of the hvac unit (hanging off the hvac unit) with a chip connector but nothing to plug into it. Black box with looked official GM rather than aftermarket. Any ideas what this might be?
tried searching and might be a cruise control piece? But seems an odd and no connector but my cruise worked fine?
car is a 91 TA 5speed
Any steers would be great
Perhaps sometime in the car's past the cruise module failed, and someone plugged in a new module and tucked it up into the dash somewhere, without putting it in the proper location?
Thread Starter
Joined: Aug 2009
Posts: 454
Likes: 26
From: London, UK
Car: 1991 Trans Am
Engine: L31, LT4 hot cam
Transmission: T5
Axle/Gears: 3:42 LSD
Re: module on HVAC box behind dash id
Thanks
Yes possible it’s had some ‘customisation’ in the past
Yes possible it’s had some ‘customisation’ in the past
Thread Starter
Joined: Aug 2009
Posts: 454
Likes: 26
From: London, UK
Car: 1991 Trans Am
Engine: L31, LT4 hot cam
Transmission: T5
Axle/Gears: 3:42 LSD
Re: module on HVAC box behind dash id
Yep none of the above. This is attached to the hvac box behind the dash. It’s about where the ECU sits but slight to the left and behind it
black box with a single chip in it (quite loosely enclosed, rattled about a bit)
black box with a single chip in it (quite loosely enclosed, rattled about a bit)
Thread Starter
Joined: Aug 2009
Posts: 454
Likes: 26
From: London, UK
Car: 1991 Trans Am
Engine: L31, LT4 hot cam
Transmission: T5
Axle/Gears: 3:42 LSD
Re: module on HVAC box behind dash id
Also to add not the VATS module which is attached to the dashboard
Joined: Aug 2013
Posts: 4,795
Likes: 895
From: MICHIGAN
Car: 1988 Trans Am
Engine: L03
Transmission: 700R4
Axle/Gears: 10 Bolt 2.73 Open
Re: module on HVAC box behind dash id
Maybe it was put there by the government. Have you been speaking ill of parliament?
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Thread Starter
Joined: Aug 2009
Posts: 454
Likes: 26
From: London, UK
Car: 1991 Trans Am
Engine: L31, LT4 hot cam
Transmission: T5
Axle/Gears: 3:42 LSD
Re: module on HVAC box behind dash id
Lol, with Boris as PM they’d have to track most of the nation
I think OrangeBird is right and it’s the Cruise Module perhaps repositioned on later airbag cars. I have a pro-flo intake and no immediate provision for the cruise cable so no loss if so
I think OrangeBird is right and it’s the Cruise Module perhaps repositioned on later airbag cars. I have a pro-flo intake and no immediate provision for the cruise cable so no loss if so
Thread Starter
Joined: Aug 2009
Posts: 454
Likes: 26
From: London, UK
Car: 1991 Trans Am
Engine: L31, LT4 hot cam
Transmission: T5
Axle/Gears: 3:42 LSD
Re: module on HVAC box behind dash id
For closure, looks like it is the cruise module per post 6 of the linked
https://www.thirdgen.org/forums/tpi/...e-control.html
thanks all
https://www.thirdgen.org/forums/tpi/...e-control.html
thanks all
Junior Member

Joined: Jun 2021
Posts: 70
Likes: 5
From: Texas
Car: 1990 LS6 Camaro
Engine: LS6 with a cam basically
Transmission: T-56
Axle/Gears: 4th gen 3.42 rear
Re: module on HVAC box behind dash id
Related question. I'm building a 1990 with an LS1 so not a big deal (I can't use this module, right?) ... But my car does NOT have a cruise control stalk on it. I was surprised to find this cruise module in the passenger side dash because of that. Did all cars get it? or was my stalk perhaps swapped or something? Thoughts?
Joined: Aug 2013
Posts: 4,795
Likes: 895
From: MICHIGAN
Car: 1988 Trans Am
Engine: L03
Transmission: 700R4
Axle/Gears: 10 Bolt 2.73 Open
Re: module on HVAC box behind dash id
Related question. I'm building a 1990 with an LS1 so not a big deal (I can't use this module, right?) ... But my car does NOT have a cruise control stalk on it. I was surprised to find this cruise module in the passenger side dash because of that. Did all cars get it? or was my stalk perhaps swapped or something? Thoughts?
Junior Member

Joined: Jun 2021
Posts: 70
Likes: 5
From: Texas
Car: 1990 LS6 Camaro
Engine: LS6 with a cam basically
Transmission: T-56
Axle/Gears: 4th gen 3.42 rear
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