What are these two things???
09-02-2017, 03:01 PM
#1
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Car: 89 RS LT1 Swap
Engine: LT1 5.7L
Transmission: 4L60E
What are these two things???
WTH are these two things? Are they vacuum related? I'm pretty sure it's emissions related but I'm stumped!
09-02-2017, 03:44 PM
#2
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Car: Yes
Engine: Usually
Transmission: Sometimes
Axle/Gears: Behind me somewhere
Re: What are these two things???
The one closer to the A/C accumulator is the AIR diverter valve, and is an emissions thing. The one behind the compressor is the heater control valve.
09-02-2017, 03:48 PM
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Car: 89 RS LT1 Swap
Engine: LT1 5.7L
Transmission: 4L60E
Re: What are these two things???
Thanks man! Other than the little vacuum line running to the heater control, would either of these cause any vacuum loss issues?
09-10-2017, 02:15 AM
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Car: 1988 Trans Am GTA
Engine: 305 TPI
Transmission: T-5
Axle/Gears: 3.70
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09-10-2017, 09:23 AM
#8
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Car: !982 Trans Am
Engine: 350
Transmission: 350 Turbo
Axle/Gears: 3.08
Re: What are these two things???
That explains a everything. Thanks for the info. Thats why my air isn't quiet right.
09-10-2017, 10:43 AM
#9
Re: What are these two things???
You would have cold air just not as cold as with a heater valve. The blend door regulates cold or hot air coming in. Plenty of cars came without a heater control valve... non ac ones and 82 83 (84?)
Last edited by Twin_Turbo; 09-19-2017 at 12:35 AM.
09-16-2017, 04:24 PM
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Car: 84 Z-28 Camaro
Engine: 383
Transmission: T-56
Axle/Gears: richmond 3.73, eaton posi
Re: What are these two things???
All of my cars never had a heater control valve...2 84 z-28''s H engines and a G engine 84 tran am...AC worked great inall of them
09-16-2017, 04:42 PM
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Re: What are these two things???
Yup, my 83 as well; but, it worked noticeably better when I put a control head with that vacuum port, and a heater control valve, in it.
"It works great" is not the same thing as "it's as good as it can possibly be".
Which is not to say, you're wrong, in either case; only, that change and improvement, often only come in small increments. But over time and enough of those little increments, there can sometimes be VAST differences. For someone as old as me, who remembers throwing stuff at his lunch as it ran by to slow it down long enough to take a bite off of it before it had a chance to bite back, .... some of these things can be a bit amazing.
"It works great" is not the same thing as "it's as good as it can possibly be".
Which is not to say, you're wrong, in either case; only, that change and improvement, often only come in small increments. But over time and enough of those little increments, there can sometimes be VAST differences. For someone as old as me, who remembers throwing stuff at his lunch as it ran by to slow it down long enough to take a bite off of it before it had a chance to bite back, .... some of these things can be a bit amazing.