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91camaro_rs Member
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Joined: 03 Dec 2008 Posts: 1712 Location: Fox Island, Wa
1991 Chevrolet Camaro RS
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Posted: Sun Sep 28, 2014 9:31 pm Post subject: colored hvac lines... |
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ok guys im stumped. i never really paid attention to this until now... on the back of heater controls all the colored lines, the gray and purple split off and have a connection where they go to the firewall and purple goes to vacuum ball/vacuum source and gray goes out to heater control valve... what if i dont have the control valve or the vacuum ball what do i do? this makes me think to because im doing this for the 83 lsx..but my 91 doesnt have the ball or control valve either....any insight?? _________________
'91 Camaro RS 5.7 TPI- 700r4- 3.27 posi- headers- chambered exhaust- |
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aaron_sK Member
Joined: 23 Jan 2006 Posts: 8834 Location: Back in beautiful Tacompton
1987 Chevrolet Camaro IROC-Z
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Posted: Sun Sep 28, 2014 9:34 pm Post subject: |
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Both lines can be capped.
Do you have cruise on either car?
Last edited by aaron_sK on Sun Sep 28, 2014 9:39 pm; edited 1 time in total |
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QwkTrip 11sec Club
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Joined: 17 Feb 2004 Posts: 3942 Location: Peoria, IL
1989 Pontiac Firebird
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Posted: Sun Sep 28, 2014 9:38 pm Post subject: |
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And you must have the check valve or the vacuum ball will be useless. |
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aaron_sK Member
Joined: 23 Jan 2006 Posts: 8834 Location: Back in beautiful Tacompton
1987 Chevrolet Camaro IROC-Z
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Posted: Sun Sep 28, 2014 9:42 pm Post subject: |
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Yup.
Actually you need a check valve of some kind in the HVAC line with or without the reservoir to prevent the doors from reverting to default positions under throttle. |
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91camaro_rs Member
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Joined: 03 Dec 2008 Posts: 1712 Location: Fox Island, Wa
1991 Chevrolet Camaro RS
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Posted: Sun Sep 28, 2014 9:42 pm Post subject: |
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Aaron no cruise on either car and non a/c as well. shouldnt the purple line at least go to a vacuum source? how do all the other colored ones get vacuum supply? _________________
'91 Camaro RS 5.7 TPI- 700r4- 3.27 posi- headers- chambered exhaust- |
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aaron_sK Member
Joined: 23 Jan 2006 Posts: 8834 Location: Back in beautiful Tacompton
1987 Chevrolet Camaro IROC-Z
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Posted: Sun Sep 28, 2014 9:47 pm Post subject: |
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Purple line needs to see manifold vacuum to shift the doors, and a check valve to keep them in place.
GM used the same check valve on every single vehicles for over two decades, just grab a couple at the yard. It's the cone-shaped three-way thing near the firewall.
The vacuum reservoir is for cruise control. GM did not use it for the solenoids like Ford did. |
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91camaro_rs Member
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Joined: 03 Dec 2008 Posts: 1712 Location: Fox Island, Wa
1991 Chevrolet Camaro RS
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Posted: Sun Sep 28, 2014 9:54 pm Post subject: |
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ok so cap the gray one, purple to check valve and then to manifold easy enough!
now i gotta go look at the 91 tomorrow to see what the heck i did with that setup lol
as you might have been able to guess the 90's style dash swap is in progress in the 83 _________________
'91 Camaro RS 5.7 TPI- 700r4- 3.27 posi- headers- chambered exhaust- |
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