1966 a/c ?
Thread Starter
Instructor
Joined: Jun 1999
Posts: 180
Likes: 23
From: CAPE CORAL FLORIDA
1966 a/c ?
on the stock 1966 a/c system there are two vacuum hoses comming out of the fire wall.
one line goes to the hot water shut off valve.
the other line goes to a tee , one line off the tee goes to intake manifold vacuum supply and the other side off the tee goes to a small valve called the suction throttling valve or stv valve.
does anyone know what this valve does.
on my stock 66, i noticed that i do not have the tee, that line only goes only goes to the intake manifold supply.
do i need to hook up a tee and run both lines.
thanks.
one line goes to the hot water shut off valve.
the other line goes to a tee , one line off the tee goes to intake manifold vacuum supply and the other side off the tee goes to a small valve called the suction throttling valve or stv valve.
does anyone know what this valve does.
on my stock 66, i noticed that i do not have the tee, that line only goes only goes to the intake manifold supply.
do i need to hook up a tee and run both lines.
thanks.
Burning Brakes
Joined: Jun 2000
Posts: 844
Likes: 2
Re: 1966 a/c ? (BILL88)
Simplified, the AC dash switch controls the amount of vacuum to the STV, the STV controls the flow of Freon in the AC system and therefore the inside vent temp. They went to a POA valve in 67.
Racer
Joined: May 2000
Posts: 424
Likes: 1
From: Milford, MI
Re: 1966 a/c ? (Viking427)
Hey Bill! I have been going through my ac as well and found an awesome AC forum for conversions and general understanding. Here is a link to my post:
http://www.ackits.com/forum/messagev...&threadid=8756
Also I recommend doing a search on "POA" in this forum as well and you will learn more than you ever wanted to know!
good luck...
http://www.ackits.com/forum/messagev...&threadid=8756
Also I recommend doing a search on "POA" in this forum as well and you will learn more than you ever wanted to know!
good luck...
Le Mans Master
Joined: Nov 2000
Posts: 7,246
Likes: 21
From: Going too fast over the hill. Iowa
Re: 1966 a/c ? (BILL88)
My car was converted from STV to a 67 POA valve by a local AC shop (without my kowledge). The POA has been no trouble in 15 years. If I understand the advice from the AC forum addree that you posted, the STV will lower the A-C pressure when the heat is on. IMO you don;t want that in a c2 Corvette, since the heater tends to overpower the A-C even at the lowest temp settings.
Racer
Joined: May 2000
Posts: 424
Likes: 1
From: Milford, MI
Re: 1966 a/c ? (magicv8)
From what I have read, the POA and STV have exactly the same function, but the STV is more easily adjustable. When you turn on the AC, there should be a vacuum operated valve that turns off the hot water flow to the core, so you don't overpower your AC. The guys over there are doing R12 to 134 conversions, and they are adjusting the low side from the stock 29psi down to 26.5psi and they say it makes all the difference.
:cheers:
:cheers:
