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Old 05-18-2022, 01:47 PM
10xhobby 10xhobby is offline
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Default 70 Trans Am A/C vacuum actuators

Hey AlI, notice that the A/C Purge door stays open when it should be closed The canister that is on the car is a single vac line , but I have a picture of the original part looks like it has a second nipple or maybe a bleed port. Any ideas ????

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Old 05-18-2022, 02:21 PM
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Formulabruce Formulabruce is offline
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Round Canister on firewall? Thats Not related to AC function directly.

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Old 05-18-2022, 02:56 PM
10xhobby 10xhobby is offline
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I know it controls the purge door, what would cause it to stay open evn when there is no vacuum ??

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Old 05-18-2022, 03:00 PM
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Originally Posted by 10xhobby View Post
I know it controls the purge door, what would cause it to stay open evn when there is no vacuum ??
So post a pic of the " purge door " .

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Old 05-19-2022, 01:52 AM
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Take the Vacuum pod off or unhook it and see if you can move the door.

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Old 05-19-2022, 07:56 AM
Trevor78 Trevor78 is offline
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Might be dual action of similar to later years, so it has completely in or out but also half-way.

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Old 05-20-2022, 12:24 PM
10xhobby 10xhobby is offline
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Quote:
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Take the Vacuum pod off or unhook it and see if you can move the door.
yes the door moves perfectly, no binding.

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Old 05-20-2022, 01:20 PM
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Has to be the vacuum switch in dash. I would borrow a vacuum pump and hook it to the main vacuum feed to the HVAC control right on passenger side underhood for troubleshooting.

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